32 results on '"Djagbletey, Gloria"'
Search Results
2. Pantropical variability in tree crown allometry
- Author
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Panzou, Grace Jopaul Loubota, Fayolle, Adeline, Jucker, Tommaso, Phillips, Oliver L, Bohlman, Stephanie, Banin, Lindsay F, Lewis, Simon L, Affum‐Baffoe, Kofi, Alves, Luciana F, Antin, Cécile, Arets, Eric, Arroyo, Luzmila, Baker, Timothy R, Barbier, Nicolas, Beeckman, Hans, Berger, Uta, Bocko, Yannick Enock, Bongers, Frans, Bowers, Sam, Brade, Thom, Brondizio, Eduardo S, Chantrain, Arthur, Chave, Jerome, Compaore, Halidou, Coomes, David, Diallo, Adama, Dias, Arildo S, Dimobe, Kangbéni, Djagbletey, Gloria Djaney, Domingues, Tomas, Doucet, Jean‐Louis, Drouet, Thomas, Forni, Eric, Godlee, John L, Goodman, Rosa C, Gourlet‐Fleury, Sylvie, Hien, Fidele, Iida, Yoshiko, Ilondea, Bhely Angoboy, Muledi, Jonathan Ilunga, Jacques, Pierre, Kuyah, Shem, López‐Portillo, Jorge, Loumeto, Jean Joël, Marimon‐Junior, Ben Hur, Marimon, Beatriz Schwantes, Mensah, Sylvanus, Mitchard, Edward TA, Moncrieff, Glenn R, Narayanan, Ayyappan, O’Brien, Sean T, Ouedraogo, Korotimi, Palace, Michael W, Pelissier, Raphael, Ploton, Pierre, Poorter, Lourens, Ryan, Casey M, Saiz, Gustavo, Santos, Karin, Schlund, Michael, Sellan, Giacomo, Sonke, Bonaventure, Sterck, Frank, Thibaut, Quentin, Van Hoef, Yorick, Veenendaal, Elmar, Vovides, Alejandra G, Xu, Yaozhan, Yao, Tze Leong, and Feldpausch, Ted R
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Environmental Sciences ,Ecological Applications ,Environmental Management ,crown allometry ,environment ,forest ,precipitation ,savanna ,soil ,stand‐ ,level variable ,tropical biomes ,Ecology - Abstract
Aim: Tree crowns determine light interception, carbon and water exchange. Thus, understanding the factors causing tree crown allometry to vary at the tree and stand level matters greatly for the development of future vegetation modelling and for the calibration of remote sensing products. Nevertheless, we know little about large-scale variation and determinants in tropical tree crown allometry. In this study, we explored the continental variation in scaling exponents of site-specific crown allometry and assessed their relationships with environmental and stand-level variables in the tropics. Location: Global tropics. Time period: Early 21st century. Major taxa studied: Woody plants. Methods: Using a dataset of 87,737 trees distributed among 245 forest and savanna sites across the tropics, we fitted site-specific allometric relationships between crown dimensions (crown depth, diameter and volume) and stem diameter using power-law models. Stand-level and environmental drivers of crown allometric relationships were assessed at pantropical and continental scales. Results: The scaling exponents of allometric relationships between stem diameter and crown dimensions were higher in savannas than in forests. We identified that continental crown models were better than pantropical crown models and that continental differences in crown allometric relationships were driven by both stand-level (wood density) and environmental (precipitation, cation exchange capacity and soil texture) variables for both tropical biomes. For a given diameter, forest trees from Asia and savanna trees from Australia had smaller crown dimensions than trees in Africa and America, with crown volumes for some Asian forest trees being smaller than those of trees in African forests. Main conclusions: Our results provide new insight into geographical variability, with large continental differences in tropical tree crown allometry that were driven by stand-level and environmental variables. They have implications for the assessment of ecosystem function and for the monitoring of woody biomass by remote sensing techniques in the global tropics.
- Published
- 2021
3. Impact of illegal mining activities on forest ecosystem services: local communities’ attitudes and willingness to participate in restoration activities in Ghana
- Author
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Obeng, Elizabeth Asantewaa, Oduro, Kwame Antwi, Obiri, Beatrice Darko, Abukari, Haruna, Guuroh, Reginald Tang, Djagbletey, Gloria Djaney, Appiah-Korang, Joseph, and Appiah, Mark
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- 2019
- Full Text
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4. Contrasting carbon cycle along tropical forest aridity gradients in W Africa and Amazonia
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Zhang-Zheng, Huanyuan, primary, Adu-Bredu, Stephen, additional, Duah-Gyamfi, Akwasi, additional, Moore, Sam, additional, Addo-Danso, Shalom, additional, Ibrahim, Forzia, additional, Amissah, Lucy, additional, Valentini, Riccardo, additional, Djagbletey, Gloria, additional, Anim-Adjei, Kelvin, additional, Owusu-Afriyie, Kennedy, additional, Gvozdevaite, Agne, additional, Ruiz-Jaen, Maria, additional, Girardin, Cecile, additional, Rifai, Sami, additional, Dahlsjö, Cecilia, additional, Riutta, Terhi, additional, Deng, Xiongjie, additional, Tang, Minxue, additional, Sun, Yuheng, additional, Prentice, Iain, additional, Menor, Imma Oliveras, additional, and Malhi, Yadvinder, additional
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- 2023
- Full Text
- View/download PDF
5. Pollen-vegetation richness and diversity relationships in the tropics
- Author
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Gosling, William D., Julier, Adele C. M., Adu-Bredu, Stephen, Djagbletey, Gloria D., Fraser, Wesley T., Jardine, Phillip E., Lomax, Barry H., Malhi, Yadvinder, Manu, Emmanuel A., Mayle, Francis E., and Moore, Sam
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- 2018
6. Above-ground biomass and structure of 260 African tropical forests
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Lewis, Simon L., Sonké, Bonaventure, Sunderland, Terry, Begne, Serge K., Lopez-Gonzalez, Gabriela, van der Heijden, Geertje M. F., Phillips, Oliver L., Affum-Baffoe, Kofi, Baker, Timothy R., Banin, Lindsay, Bastin, Jean-François, Beeckman, Hans, Boeckx, Pascal, Bogaert, Jan, De Cannière, Charles, Chezeaux, Eric, Clark, Connie J., Collins, Murray, Djagbletey, Gloria, Djuikouo, Marie Noël K., Droissart, Vincent, Doucet, Jean-Louis, Ewango, Cornielle E. N., Fauset, Sophie, Feldpausch, Ted R., Foli, Ernest G., Gillet, Jean-François, Hamilton, Alan C., Harris, David J., Hart, Terese B., de Haulleville, Thales, Hladik, Annette, Hufkens, Koen, Huygens, Dries, Jeanmart, Philippe, Jeffery, Kathryn J., Kearsley, Elizabeth, Leal, Miguel E., Lloyd, Jon, Lovett, Jon C., Makana, Jean-Remy, Malhi, Yadvinder, Marshall, Andrew R., Ojo, Lucas, Peh, Kelvin S.-H., Pickavance, Georgia, Poulsen, John R., Reitsma, Jan M., Sheil, Douglas, Simo, Murielle, Steppe, Kathy, Taedoumg, Hermann E., Talbot, Joey, Taplin, James R. D., Taylor, David, Thomas, Sean C., Toirambe, Benjamin, Verbeeck, Hans, Vleminckx, Jason, White, Lee J. T., Willcock, Simon, Woell, Hannsjorg, and Zemagho, Lise
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- 2013
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7. MODIS Vegetation Continuous Fields tree cover needs calibrating in tropical savannas
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Adzhar, Rahayu, primary, Kelley, Douglas I., additional, Dong, Ning, additional, George, Charles, additional, Torello Raventos, Mireia, additional, Veenendaal, Elmar, additional, Feldpausch, Ted R., additional, Phillips, Oliver L., additional, Lewis, Simon L., additional, Sonké, Bonaventure, additional, Taedoumg, Herman, additional, Schwantes Marimon, Beatriz, additional, Domingues, Tomas, additional, Arroyo, Luzmila, additional, Djagbletey, Gloria, additional, Saiz, Gustavo, additional, and Gerard, France, additional
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- 2022
- Full Text
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8. Patterns in leaf traits of leguminous and non-leguminous dominant trees along a rainfall gradient in Ghana
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Song, Minghua, Djagbletey, Gloria, Nkrumah, Elvis E., and Huang, Mei
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- 2016
- Full Text
- View/download PDF
9. Pantropical variability in tree crown allometry
- Author
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Loubota Panzou, Grace Jopaul, Fayolle, Adeline, Jucker, Tommaso, Phillips, Oliver L., Bohlman, Stephanie, Banin, Lindsay F., Lewis, Simon L., Affum-Baffoe, Kofi, Alves, Luciana F., Antin, Cécile, Arets, Eric, Arroyo, Luzmila, Baker, Timothy R., Barbier, Nicolas, Beeckman, Hans, Berger, Uta, Bocko, Yannick, Bongers, Frans, Bowers, Samuel, Brade, Thomas, Brondizio, Eduardo S., Chantrain, Arthur, Chave, Jérôme, Compaore, Halidou, Coomes, David A., Diallo, Adama, Dias, Arildo S., Dimobe, Kangbéni, Djaney Djagbletey, Gloria, Domingues, Tomas, Doucet, Jean-Louis, Drouet, Thomas, Forni, Eric, Godlee, John L., Goodman, Rosa C., and Gourlet-Fleury, Sylvie
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Télédétection ,forêt tropicale ,F50 - Anatomie et morphologie des plantes ,Houppier ,Allométrie ,biomasse aérienne des arbres ,Anatomie végétale ,K01 - Foresterie - Considérations générales ,Classe de cime ,Zone tropicale - Abstract
Aim: Tree crowns determine light interception, carbon and water exchange. Thus, understanding the factors causing tree crown allometry to vary at the tree and stand level matters greatly for the development of future vegetation modelling and for the calibration of remote sensing products. Nevertheless, we know little about large-scale variation and determinants in tropical tree crown allometry. In this study, we explored the continental variation in scaling exponents of site-specific crown allometry and assessed their relationships with environmental and stand-level variables in the tropics. Location: Global tropics. Time period: Early 21st century. Major taxa studied: Woody plants. Methods: Using a dataset of 87,737 trees distributed among 245 forest and savanna sites across the tropics, we fitted site-specific allometric relationships between crown dimensions (crown depth, diameter and volume) and stem diameter using power-law models. Stand-level and environmental drivers of crown allometric relationships were assessed at pantropical and continental scales. Results: The scaling exponents of allometric relationships between stem diameter and crown dimensions were higher in savannas than in forests. We identified that continental crown models were better than pantropical crown models and that continental differences in crown allometric relationships were driven by both stand-level (wood density) and environmental (precipitation, cation exchange capacity and soil texture) variables for both tropical biomes. For a given diameter, forest trees from Asia and savanna trees from Australia had smaller crown dimensions than trees in Africa and America, with crown volumes for some Asian forest trees being smaller than those of trees in African forests. Main conclusions: Our results provide new insight into geographical variability, with large continental differences in tropical tree crown allometry that were driven by stand-level and environmental variables. They have implications for the assessment of ecosystem function and for the monitoring of woody biomass by remote sensing techniques in the global tropics.
- Published
- 2021
10. Fine root dynamics across pantropical rainforest ecosystems
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Huaraca Huasco, Walter, primary, Riutta, Terhi, additional, Girardin, Cécile A. J., additional, Hancco Pacha, Fernando, additional, Puma Vilca, Beisit L., additional, Moore, Sam, additional, Rifai, Sami W., additional, del Aguila‐Pasquel, Jhon, additional, Araujo Murakami, Alejandro, additional, Freitag, Renata, additional, Morel, Alexandra C., additional, Demissie, Sheleme, additional, Doughty, Christopher E., additional, Oliveras, Imma, additional, Galiano Cabrera, Darcy F., additional, Durand Baca, Liliana, additional, Farfán Amézquita, Filio, additional, Silva Espejo, Javier E., additional, da Costa, Antonio C.L., additional, Oblitas Mendoza, Erick, additional, Quesada, Carlos Alberto, additional, Evouna Ondo, Fidele, additional, Edzang Ndong, Josué, additional, Jeffery, Kathryn J., additional, Mihindou, Vianet, additional, White, Lee J. T., additional, N'ssi Bengone, Natacha, additional, Ibrahim, Forzia, additional, Addo‐Danso, Shalom D., additional, Duah‐Gyamfi, Akwasi, additional, Djaney Djagbletey, Gloria, additional, Owusu‐Afriyie, Kennedy, additional, Amissah, Lucy, additional, Mbou, Armel T., additional, Marthews, Toby R., additional, Metcalfe, Daniel B., additional, Aragão, Luiz E. O., additional, Marimon‐Junior, Ben H., additional, Marimon, Beatriz S., additional, Majalap, Noreen, additional, Adu‐Bredu, Stephen, additional, Abernethy, Katharine A., additional, Silman, Miles, additional, Ewers, Robert M., additional, Meir, Patrick, additional, and Malhi, Yadvinder, additional
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- 2021
- Full Text
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11. Assessing MODIS Vegetation Continuous Fields tree cover product (collection 6): performance and applicability in tropical forests and savannas
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Adzhar, Rahayu, primary, Kelley, Douglas I., additional, Dong, Ning, additional, Torello Raventos, Mireia, additional, Veenendaal, Elmar, additional, Feldpausch, Ted R., additional, Philips, Oliver L., additional, Lewis, Simon, additional, Sonké, Bonaventure, additional, Taedoumg, Herman, additional, Schwantes Marimon, Beatriz, additional, Domingues, Tomas, additional, Arroyo, Luzmila, additional, Djagbletey, Gloria, additional, Saiz, Gustavo, additional, and Gerard, France, additional
- Published
- 2021
- Full Text
- View/download PDF
12. Pantropical variability in tree crown allometry
- Author
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Panzou, Grace Jopaul Loubota, Fayolle, Adeline, Jucker, Tommaso, Phillips, Oliver L., Bohlman, Stephanie, Lewis, Simon L., Banin, Lindsay F., Alves, Luciana F., Antin, Cecile, Arets, Eric, Baker, Timothy R., Barbier, Nicolas, Beeckman, Hans, Berger, Uta, Bongers, Frans, Bowers, Sam, Brade, Thom, Brondizio, Eduardo S., Chantrain, Arthur, Chave, Jerome, Dias, Arildo S., Compaore, Halidou, Coomes, David, Diallo, Adama, Dimobe, Kangbeni, Djagbletey, Gloria Djaney, Domingues, Tomas, Doucet, Jean-Louis, Drouet, Thomas, Forni, Eric, Goodman, Rosa, Godlee, John L., Gourlet-Fleury, Sylvie, Hien, Fidele, Iida, Yoshiko, Ilondea, Bhely Angoboy, Jacques, Pierre, Kuyah, Shem, Lopez-Portillo, Jorge, Moncrieff, Glenn R., Marimon-Junior, Ben Hur, Marimon, Beatriz Schwantes, Mensah, Sylvanus, Mitchard, Edward T. A., Narayanan, Ayyappan, O'Brien, Sean T., Ouedraogo, Korotimi, Palace, Michael W., Pelissier, Raphael, Ploton, Pierre, Poorter, Lourens, Ryan, Casey M., Saiz, Gustavo, Santos, Karin, Schlund, Michael, Sellan, Giacomo, Sonke, Bonaventure, Sterck, Frank, Veenendaal, Elmar, Thibaut, Quentin, Van Hoef, Yorick, Vovides, Alejandra G., Xu, Yaozhan, Yao, Tze Leong, and Feldpausch, Ted R.
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Forest Science - Abstract
Aim Tree crowns determine light interception, carbon and water exchange. Thus, understanding the factors causing tree crown allometry to vary at the tree and stand level matters greatly for the development of future vegetation modelling and for the calibration of remote sensing products. Nevertheless, we know little about large-scale variation and determinants in tropical tree crown allometry. In this study, we explored the continental variation in scaling exponents of site-specific crown allometry and assessed their relationships with environmental and stand-level variables in the tropics.Location Global tropics.Time period Early 21st century.Major taxa studied Woody plants.Methods Using a dataset of 87,737 trees distributed among 245 forest and savanna sites across the tropics, we fitted site-specific allometric relationships between crown dimensions (crown depth, diameter and volume) and stem diameter using power-law models. Stand-level and environmental drivers of crown allometric relationships were assessed at pantropical and continental scales.Results The scaling exponents of allometric relationships between stem diameter and crown dimensions were higher in savannas than in forests. We identified that continental crown models were better than pantropical crown models and that continental differences in crown allometric relationships were driven by both stand-level (wood density) and environmental (precipitation, cation exchange capacity and soil texture) variables for both tropical biomes. For a given diameter, forest trees from Asia and savanna trees from Australia had smaller crown dimensions than trees in Africa and America, with crown volumes for some Asian forest trees being smaller than those of trees in African forests.Main conclusions Our results provide new insight into geographical variability, with large continental differences in tropical tree crown allometry that were driven by stand-level and environmental variables. They have implications for the assessment of ecosystem function and for the monitoring of woody biomass by remote sensing techniques in the global tropics.
- Published
- 2020
13. Pantropical variability in tree crown allometry
- Author
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Loubota Panzou, Grace Jopaul, primary, Fayolle, Adeline, additional, Jucker, Tommaso, additional, Phillips, Oliver L., additional, Bohlman, Stephanie, additional, Banin, Lindsay F., additional, Lewis, Simon L., additional, Affum‐Baffoe, Kofi, additional, Alves, Luciana F., additional, Antin, Cécile, additional, Arets, Eric, additional, Arroyo, Luzmila, additional, Baker, Timothy R., additional, Barbier, Nicolas, additional, Beeckman, Hans, additional, Berger, Uta, additional, Bocko, Yannick Enock, additional, Bongers, Frans, additional, Bowers, Sam, additional, Brade, Thom, additional, Brondizio, Eduardo S., additional, Chantrain, Arthur, additional, Chave, Jerome, additional, Compaore, Halidou, additional, Coomes, David, additional, Diallo, Adama, additional, Dias, Arildo S., additional, Dimobe, Kangbéni, additional, Djagbletey, Gloria Djaney, additional, Domingues, Tomas, additional, Doucet, Jean‐Louis, additional, Drouet, Thomas, additional, Forni, Eric, additional, Godlee, John L., additional, Goodman, Rosa C., additional, Gourlet‐Fleury, Sylvie, additional, Hien, Fidele, additional, Iida, Yoshiko, additional, Ilondea, Bhely Angoboy, additional, Ilunga Muledi, Jonathan, additional, Jacques, Pierre, additional, Kuyah, Shem, additional, López‐Portillo, Jorge, additional, Loumeto, Jean Joël, additional, Marimon‐Junior, Ben Hur, additional, Marimon, Beatriz Schwantes, additional, Mensah, Sylvanus, additional, Mitchard, Edward T. A., additional, Moncrieff, Glenn R., additional, Narayanan, Ayyappan, additional, O’Brien, Sean T., additional, Ouedraogo, Korotimi, additional, Palace, Michael W., additional, Pelissier, Raphael, additional, Ploton, Pierre, additional, Poorter, Lourens, additional, Ryan, Casey M., additional, Saiz, Gustavo, additional, Santos, Karin, additional, Schlund, Michael, additional, Sellan, Giacomo, additional, Sonke, Bonaventure, additional, Sterck, Frank, additional, Thibaut, Quentin, additional, Van Hoef, Yorick, additional, Veenendaal, Elmar, additional, Vovides, Alejandra G., additional, Xu, Yaozhan, additional, Yao, Tze Leong, additional, and Feldpausch, Ted R., additional
- Published
- 2020
- Full Text
- View/download PDF
14. Variation in vegetation cover and seedling performance of tree species in a forest-savanna ecotone
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Issifu, Hamza, primary, Ametsitsi, George K. D., additional, de Vries, Lana J., additional, Djagbletey, Gloria Djaney, additional, Adu-Bredu, Stephen, additional, Vergeer, Philippine, additional, van Langevelde, Frank, additional, and Veenendaal, Elmar, additional
- Published
- 2019
- Full Text
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15. Assessing MODIS Vegetation Continuous Fields tree cover product (collection 6): performance and applicability in tropical forests and savannas.
- Author
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Adzhar, Rahayu, Kelley, Douglas I., Ning Dong, Raventos, Mireia Torello, Veenendaal, Elmar, Feldpausch, Ted R., Philips, Oliver L., Lewis, Simon, Sonké, Bonaventure, Taedoumg, Herman, Marimon, Beatriz Schwantes, Domingues, Tomas, Arroyo, Luzmila, Djagbletey, Gloria, Saiz, Gustavo, and Gerard, France
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SAVANNAS ,TROPICAL forests ,FOREST surveys ,LAND cover ,TREES ,STEREO vision (Computer science) ,WOODY plants - Abstract
The Moderate Resolution Imaging Spectroradiometer vegetation continuous fields (MODIS VCF) Earth observation product is widely used to estimate forest cover changes, parameterise vegetation and Earth System models, and as a reference for validation or calibration where field data is limited. However, although limited independent validations of MODIS VCF have shown that MODIS VCF's accuracy decreases when estimating tree cover in sparsely-vegetated areas, such as in tropical savannas, no study has yet assessed the impact this may have on the VCF based tree cover distributions used by many in their research. Using tropical forest and savanna inventory data collected by the TROpical Biomes In Transition (TROBIT) project, we produce a series of corrections that take into account (i) the spatial disparity between the in-situ plot size and the MODIS VCF pixel, and (ii) the trees' spatial distribution within in-situ plots. We then applied our corrections to areas identified as forest or savanna in the International Geosphere-Biosphere Programme (IGBP) land cover mapping product. All IGBP classes identified as "savanna" show substantial increases in cover after correction, indicating that the most recent version of MODIS VCF consistently underestimates woody cover in tropical savannas. We estimate that MODIS VCF could be underestimating tropical tree cover by between 9-15 %. Models that use VCF as their benchmark could be underestimating the carbon uptake in forest-savanna areas and misrepresenting forest-savanna dynamics. While more detailed in-situ field data is necessary to produce more accurate and reliable corrections, we recommend caution when using MODIS VCF in tropical savannas. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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16. Compositional patterns of overstorey and understorey woody communities in a forest–savanna boundary in Ghana
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Armani, Mohammed, primary, Van Langevelde, Frank, additional, Tomlinson, Kyle Warwick, additional, Adu-Bredu, Stephen, additional, Djagbletey, Gloria Djaney, additional, and Veenendaal, Elmar M., additional
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- 2018
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17. Forest biomass, productivity and carbon cycling along a rainfall gradient in West Africa
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Moore, Sam, primary, Adu‐Bredu, Stephen, additional, Duah‐Gyamfi, Akwasi, additional, Addo‐Danso, Shalom D., additional, Ibrahim, Forzia, additional, Mbou, Armel T., additional, Grandcourt, Agnès, additional, Valentini, Riccardo, additional, Nicolini, Giacomo, additional, Djagbletey, Gloria, additional, Owusu‐Afriyie, Kennedy, additional, Gvozdevaite, Agne, additional, Oliveras, Imma, additional, Ruiz‐Jaen, Maria C., additional, and Malhi, Yadvinder, additional
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- 2017
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18. Pollen-vegetation richness and diversity relationships in the tropics
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Gosling, William D., primary, Julier, Adele C. M., additional, Adu-Bredu, Stephen, additional, Djagbletey, Gloria D., additional, Fraser, Wesley T., additional, Jardine, Phillip E., additional, Lomax, Barry H., additional, Malhi, Yadvinder, additional, Manu, Emmanuel A., additional, Mayle, Francis E., additional, and Moore, Sam, additional
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- 2017
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19. Digitization of indigenous knowledge on forest foods and medicines
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Sraku-Lartey, Margaret, primary, Acquah, Stella Britwum, additional, Samar, Sparkler Brefo, additional, and Djagbletey, Gloria Djaney, additional
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- 2017
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20. Winners and losers: tropical forest tree seedling survival across a West African forest–savanna transition
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Cardoso, Anabelle W., primary, Medina‐Vega, José A., additional, Malhi, Yadvinder, additional, Adu‐Bredu, Stephen, additional, Ametsitsi, George K.D., additional, Djagbletey, Gloria, additional, Langevelde, Frank, additional, Veenendaal, Elmar, additional, and Oliveras, Immaculada, additional
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- 2016
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21. Distribution of Necromass under Different Forest Stands in a Savannah Ecosystem
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Djagbletey, Ebenezer, primary, Quansah, Charles, additional, Djagbletey, Gloria, additional, Tuffour, Henry, additional, and Abubakari, Awudu, additional
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- 2016
- Full Text
- View/download PDF
22. Compositional patterns of overstorey and understorey woody communities in a forest-savanna boundary in Ghana.
- Author
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Tomlinson, Kyle Warwick, Armani, Mohammed, Van Langevelde, Frank, Adu-Bredu, Stephen, Djagbletey, Gloria Djaney, and Veenendaal, Elmar M.
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WOODY plants ,SAVANNAS - Abstract
Background: Forest and savanna vegetation in the zone of transition (ZOT) contain distinct woody species due to fire, drought and herbivory barriers that constrain forest species from invading adjacent savannas and vice-versa. Little is known if these barriers cause divergence in species composition between the overstorey and understorey strata in these vegetation types. Aim: We investigated woody species composition across overstorey and understorey strata in the ZOT and explored the relationship between soil fertility and species composition patterns. Methods: We sampled overstorey and understorey woody species and determined soil nutrient concentrations in twenty-five 20 m × 20 m plots in a ZOT in Ghana. Results: Forest and savanna species dominated the overstorey and understorey of their respective environments. However, species composition was decoupled between the overstorey and understorey strata in both forest and savanna vegetations. Few savanna and forest species had individuals co-occurring in both overstorey and understorey such that ~65% of the dominant species was limited to only one stratum. Soil fertility had little effect on these patterns. Conclusion: These patterns indicate that, forest and savanna species face significant recruitment barriers in their respective environments, suggesting that requirements for juvenile establishment may differ from recruitments to the canopy layer. [ABSTRACT FROM AUTHOR]
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- 2018
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23. Forest biomass, productivity and carbon cycling along a rainfall gradient in West Africa.
- Author
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Moore, Sam, Adu‐Bredu, Stephen, Duah‐Gyamfi, Akwasi, Addo‐Danso, Shalom D., Ibrahim, Forzia, Mbou, Armel T., de Grandcourt, Agnès, Valentini, Riccardo, Nicolini, Giacomo, Djagbletey, Gloria, Owusu‐Afriyie, Kennedy, Gvozdevaite, Agne, Oliveras, Imma, Ruiz‐Jaen, Maria C., and Malhi, Yadvinder
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FOREST biomass ,CARBON cycle ,RAINFALL ,TROPICAL forests ,SAVANNAS ,TROPICAL dry forests ,EVERGREENS - Abstract
Abstract: Net Primary Productivity (NPP) is one of the most important parameters in describing the functioning of any ecosystem and yet it arguably remains a poorly quantified and understood component of carbon cycling in tropical forests, especially outside of the Americas. We provide the first comprehensive analysis of NPP and its carbon allocation to woody, canopy and root growth components at contrasting lowland West African forests spanning a rainfall gradient. Using a standardized methodology to study evergreen (EF), semi‐deciduous (SDF), dry forests (DF) and woody savanna (WS), we find that (i) climate is more closely related with above and belowground C stocks than with NPP (ii) total NPP is highest in the SDF site, then the EF followed by the DF and WS and that (iii) different forest types have distinct carbon allocation patterns whereby SDF allocate in excess of 50% to canopy production and the DF and WS sites allocate 40%–50% to woody production. Furthermore, we find that (iv) compared with canopy and root growth rates the woody growth rate of these forests is a poor proxy for their overall productivity and that (v) residence time is the primary driver in the productivity‐allocation‐turnover chain for the observed spatial differences in woody, leaf and root biomass across the rainfall gradient. Through a systematic assessment of forest productivity we demonstrate the importance of directly measuring the main components of above and belowground NPP and encourage the establishment of more permanent carbon intensive monitoring plots across the tropics. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
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24. Patterns in leaf traits of leguminous and non-leguminous dominant trees along a rainfall gradient in Ghana
- Author
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Song, Minghua, primary, Djagbletey, Gloria, additional, Nkrumah, Elvis E., additional, and Huang, Mei, additional
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- 2015
- Full Text
- View/download PDF
25. Foliar trait contrasts between African forest and savanna trees: genetic versus environmental effects
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Schrodt, Franziska, primary, Domingues, Tomas F., additional, Feldpausch, Ted R., additional, Saiz, Gustavo, additional, Quesada, Carlos Alberto, additional, Schwarz, Michael, additional, Ishida, F. Yoko, additional, Compaore, Halidou, additional, Diallo, Adamo, additional, Djagbletey, Gloria, additional, Hien, Fidele, additional, Sonké, Bonaventure, additional, Toedoumg, Herman, additional, Zapfack, Loius, additional, Hiernaux, Pierre, additional, Mougin, Eric, additional, Bird, Michael. I., additional, Grace, John, additional, Lewis, Simon L., additional, Veenendaal, Elmar M., additional, and Lloyd, Jon, additional
- Published
- 2015
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26. On the delineation of tropical vegetation types with an emphasis on forest/savanna transitions
- Author
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Torello-Raventos, Mireia, primary, Feldpausch, Ted R., additional, Veenendaal, Elmar, additional, Schrodt, Franziska, additional, Saiz, Gustavo, additional, Domingues, Tomas F., additional, Djagbletey, Gloria, additional, Ford, Andrew, additional, Kemp, Jeanette, additional, Marimon, Beatriz S., additional, Hur Marimon Junior, Ben, additional, Lenza, Eddie, additional, Ratter, James A., additional, Maracahipes, Leandro, additional, Sasaki, Denise, additional, Sonké, Bonaventure, additional, Zapfack, Louis, additional, Taedoumg, Hermann, additional, Villarroel, Daniel, additional, Schwarz, Michael, additional, Quesada, Carlos A., additional, Yoko Ishida, F., additional, Nardoto, Gabriela B., additional, Affum-Baffoe, Kofi, additional, Arroyo, Luzmilla, additional, M.J.S. Bowman, David, additional, Compaore, Halidou, additional, Davies, Kalu, additional, Diallo, Adama, additional, Fyllas, Nikolaos M., additional, Gilpin, Martin, additional, Hien, Fidèle, additional, Johnson, Michelle, additional, Killeen, Timothy J., additional, Metcalfe, Daniel, additional, Miranda, Heloisa S., additional, Steininger, Mark, additional, Thomson, John, additional, Sykora, Karle, additional, Mougin, Eric, additional, Hiernaux, Pierre, additional, Bird, Michael I., additional, Grace, John, additional, Lewis, Simon L., additional, Phillips, Oliver L., additional, and Lloyd, Jon, additional
- Published
- 2013
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27. Patterns in leaf traits of leguminous and non-leguminous dominant trees along a rainfall gradient in Ghana.
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Minghua Song, Djagbletey, Gloria, Nkrumah, Elvis E., and Mei Huang
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LEAF diseases & pests ,PLANT diseases ,RAINFALL ,NITROGEN cycle ,CARBON content of plants - Abstract
Aims Both dominance distribution of species and the composition of the dominant species determine the distribution of traits within community. Leaf carbon (C) and nitrogen (N) isotopic composition are important leaf traits, and such traits of dominant species are associated with ecosystem C, water and N cycling. Very little is known how dominant species with distinct traits (e.g. N-fixing leguminous and non-leguminous trees) mediate resource utilization of the ecosystems in stressful environment. Methods Leaves of 81 dominant leguminous and non-leguminous trees were collected in forest (moist semi-deciduous and dry semi-deciduous ecosystems) and savanna (costal savanna, Guinean savanna and west Sudanian savanna ecosystems) areas and the transitional zone (between the forest and the savanna) along the transect from the south to the north of Ghana. We measured leaf traits, i.e. leaf δ
13 C, leaf δ15 N, leaf water content, leaf mass per area (LMA) and C and N concentration. Correlation analyses were used to examine trait- trait relationships, and relationships of leaf traits with temperature and precipitation. We used analysis of covariance to test the differences in slopes of the linear regressions between legumes and non-legumes. Important Findings Leaf δ13 C, δ15 N, leaf water content and LMA did not differ between leguminous and non-leguminous trees. Leaf N concentration and C:N ratio differed between the two groups. Moreover, leaf traits varied significantly among the six ecosystems. δ13 C values were negatively correlated with annual precipitation and positively correlated with mean annual temperature. In contrast, leaf δ15 N of non-leguminous trees were positively correlated with annual precipitation and negatively correlated with mean annual temperature. For leguminous trees, such correlations were not significant. We also found significant coordination between leaf traits. However, the slopes of the linear relationships were significantly different between leguminous and non-leguminous trees. Our results indicate that shifts in dominant trees with distinct water-use efficiency were corresponded to the rainfall gradient. Moreover, leguminous trees, those characterized with relative high water-use efficiency in the low rainfall ecosystems, were also corresponded to the relative high N use efficiency. The high proportion of leguminous trees in the savannas is crucial to mitigate nutrient stress. [ABSTRACT FROM AUTHOR]- Published
- 2016
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28. Variation in soil carbon stocks and their determinants across a precipitation gradient in West Africa
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Saiz, Gustavo, primary, Bird, Michael I., additional, Domingues, Tomas, additional, Schrodt, Franziska, additional, Schwarz, Michael, additional, Feldpausch, Ted R., additional, Veenendaal, Elmar, additional, Djagbletey, Gloria, additional, Hien, Fidele, additional, Compaore, Halidou, additional, Diallo, Adama, additional, and Lloyd, Jon, additional
- Published
- 2012
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29. Co-limitation of photosynthetic capacity by nitrogen and phosphorus in West Africa woodlands
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DOMINGUES, TOMAS FERREIRA, primary, MEIR, PATRICK, additional, FELDPAUSCH, TED R., additional, SAIZ, GUSTAVO, additional, VEENENDAAL, ELMAR M., additional, SCHRODT, FRANZISKA, additional, BIRD, MICHAEL, additional, DJAGBLETEY, GLORIA, additional, HIEN, FIDELE, additional, COMPAORE, HALIDOU, additional, DIALLO, ADAMA, additional, GRACE, JOHN, additional, and LLOYD, JON, additional
- Published
- 2010
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30. Contributions of woody and herbaceous vegetation to tropical savanna ecosystem productivity: a quasi-global estimate†.
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Lloyd, Jon, Bird, Michael I., Vellen, Lins, Miranda, Antonio Carlos, Veenendaal, Elmar M., Djagbletey, Gloria, Miranda, Heloisa S., Cook, Garry, and Farquhar, Graham D.
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WOODY plants ,VEGETATION dynamics ,ECOSYSTEM management ,HERBACEOUS plants ,BIOTIC communities - Abstract
To estimate the relative contributions of woody and herbaceous vegetation to savanna productivity, we measured the
13 C/12 C isotopic ratios of leaves from trees, shrubs, grasses and the surface soil carbon pool for 22 savannas in Australia, Brazil and Ghana covering the full savanna spectrum ranging from almost pure grassland to closed woodlands on all three continents. All trees and shrubs sampled were of the C3 pathway and all grasses of the C3 pathway with the exception of Echinolaena inflexa (Poir.) Chase, a common C3 grass of the Brazilian cerrado. By comparing the carbon isotopic compositions of the plant and carbon pools, a simple model relating soil δ13 C to the relative abundances of trees + shrubs (woody plants) and grasses was developed. The model suggests that the relative proportions of a savanna ecosystem's total foliar projected cover attributable to grasses versus woody plants is a simple and reliable index of the relative contributions of grasses and woody plants to savanna net productivity. Model calibrations against woody tree canopy cover made it possible to estimate the proportion of savanna productivity in the major regions of the world attributable to trees + shrubs and grasses from ground-based observational maps of savanna woodiness. Overall, it was estimated that 59% of the net primary productivity (Np ) of tropical savannas is attributable to C4 grasses, but that this proportion varies significantly within and between regions. The C4 grasses make their greatest relative contribution to savanna Np in the Neotropics, whereas in African regions, a greater proportion of savanna Np is attributable to woody plants. The relative contribution of C4 grasses in Australian savannas is intermediate between those in the Neotropics and Africa. These differences can be broadly ascribed to large scale differences in soil fertility and rainfall. [ABSTRACT FROM AUTHOR]- Published
- 2008
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31. Pollen-vegetation richness and diversity relationships in the tropics
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Gosling, William D., Julier, Adele C. M., Adu-Bredu, Stephen, Djagbletey, Gloria D., Fraser, Wesley T., Jardine, Phillip E., Lomax, Barry H., Malhi, Yadvinder, Manu, Emmanuel A., Mayle, Francis E., and Moore, Sam
- Subjects
15. Life on land - Abstract
Tracking changes in biodiversity through time requires an understanding of the relationship between modern diversity and how this diversity is preserved in the fossil record. Fossil pollen is one way in which past vegetation diversity can be reconstructed. However, there is limited understanding of modern pollen-vegetation diversity relationships from biodiverse tropical ecosystems. Here, pollen (palynological) richness and diversity (Hill N (1)) are compared with vegetation richness and diversity from forest and savannah ecosystems in the New World and Old World tropics (Neotropics and Palaeotropics). Modern pollen data were obtained from artificial pollen traps deployed in 1-ha vegetation study plots from which vegetation inventories had been completed in Bolivia and Ghana. Pollen counts were obtained from 15 to 22 traps per plot, and aggregated pollen sums for each plot were > 2,500. The palynological richness/diversity values from the Neotropics were moist evergreen forest = 86/6.8, semi-deciduous dry forest = 111/21.9, wooded savannah = 138/31.5, and from the Palaeotropics wet evergreen forest = 144/28.3, semi-deciduous moist forest = 104/4.4, forest-savannah transition = 121/14.1; the corresponding vegetation richness/diversity was 100/36.7, 80/38.7 and 71/39.4 (Neotropics), and 101/54.8, 87/45.5 and 71/34.5 (Palaeotropics). No consistent relationship was found between palynological richness/diversity, and plot vegetation richness/diversity, due to the differential influence of other factors such as landscape diversity, pollination strategy, and pollen source area. Palynological richness exceeded vegetation richness, while pollen diversity was lower than vegetation diversity. The relatively high global diversity of tropical vegetation was found to be reflected in the pollen rain., Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe, 562
32. Foliar trait contrasts between African forest and savanna trees: genetic versus environmental effects.
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Schrodt F, Domingues TF, Feldpausch TR, Saiz G, Quesada CA, Schwarz M, Ishida FY, Compaore H, Diallo A, Djagbletey G, Hien F, Sonké B, Toedoumg H, Zapfack L, Hiernaux P, Mougin E, Bird MI, Grace J, Lewis SL, Veenendaal EM, and Lloyd J
- Abstract
Variations in leaf mass per unit area (Ma) and foliar concentrations of N, P, C, K, Mg and Ca were determined for 365 trees growing in 23 plots along a West African precipitation gradient ranging from 0.29 to 1.62m a-1. Contrary to previous studies, no marked increase in Ma with declining precipitation was observed, but savanna tree foliar [N] tended to be higher at the drier sites (mass basis). Generally, Ma was slightly higher and [N] slightly lower for forest vs savanna trees with most of this difference attributable to differences in soil chemistry. No systematic variations in [P], [Mg] and [Ca] with precipitation or between trees of forest vs savanna stands were observed. We did, however, find a marked increase in foliar [K] of savanna trees as precipitation declined, with savanna trees also having a significantly lower [K] than those of nearby forest. These differences were not related to differences in soil nutrient status and were accompanied by systematic changes in [C] of opposite sign. We suggest an important but as yet unidentified role for K in the adaption of savanna species to periods of limited water availability; with foliar [K] being also an important factor differentiating tree species adapted to forest vs savanna soils within the 'zone of transition' of Western Africa.
- Published
- 2014
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