25 results on '"Heijmans, Monique M.P.D."'
Search Results
2. Depth-based differentiation in nitrogen uptake between graminoids and shrubs in an Arctic tundra plant community
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Wang, Peng, Limpens, Juul, Nauta, Ake, van Huissteden, Corine, van Rijssel, Sophie Quirina, Mommer, Liesje, de Kroon, Hans, Maximov, Trofim C., and Heijmans, Monique M.P.D.
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- 2018
3. Above- and below-ground responses of four tundra plant functional types to deep soil heating and surface soil fertilization
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Wang, Peng, Limpens, Juul, Mommer, Liesje, van Ruijven, Jasper, Nauta, Ake L., Berendse, Frank, Schaepman-Strub, Gabriela, Blok, Daan, Maximov, Trofim C., and Heijmans, Monique M.P.D.
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- 2017
4. Short-term root and leaf decomposition of two dominant plant species in a Siberian tundra
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Wang, Peng, van Ruijven, Jasper, Heijmans, Monique M.P.D., Berendse, Frank, Maksimov, Ayal, Maximov, Trofim, and Mommer, Liesje
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- 2017
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5. Shrub growth rate and bark responses to soil warming and nutrient addition – A dendroecological approach in a field experiment
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Iturrate-Garcia, Maitane, Heijmans, Monique M.P.D., Schweingruber, Fritz H., Maximov, Trofim C., Niklaus, Pascal A., and Schaepman-Strub, Gabriela
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- 2017
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6. Spatiotemporal variability in precipitation-growth association of Betula nana in the Siberian lowland tundra
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Magnússon, Rúna, Sass-Klaassen, Ute, Limpens, Juul, Karsanaev, Sergey V., Ras, Susan, van Huissteden, Ko, Blok, Daan, Heijmans, Monique M.P.D., Magnússon, Rúna, Sass-Klaassen, Ute, Limpens, Juul, Karsanaev, Sergey V., Ras, Susan, van Huissteden, Ko, Blok, Daan, and Heijmans, Monique M.P.D.
- Abstract
Shrubs are expanding across a warming Arctic, evident from range expansion and increases in biomass, stature and cover. This influences numerous aspects of Arctic ecosystems. While shrub growth is generally positively associated with summer temperature, tundra ecosystems are characterised by abiotic gradients on small spatial scales (metres), and the Arctic climate and its year-to-year variability are changing rapidly. Hence, it is often unclear to what extent climate-growth associations are scalable to future climate scenarios and across environmental gradients within ecosystems. Here, we investigate the stability of climate–growth associations of Arctic dwarf shrubs across small-scale (metre to kilometre) topographic gradients and decadal timescales. We constructed ring width series (1974–2018) for a common Arctic dwarf shrub (Betula nana) for three representative types of subsites in the Siberian lowland tundra: higher elevation, lower elevation and thermokarst-affected (thaw ponds) terrain. We quantified decadal variability in climate–growth associations across subsites using partial least squares regression and a moving window approach. We found consistently positive association of shrub radial growth with summer temperature, but substantial spatial and temporal variability in precipitation response. Association of shrub growth with summer rainfall increased in recent decades. Shrubs on elevated sites showed particularly strong response to rainfall following drier periods, and a negative association with recent snowfall extremes. Shrubs sampled from thaw ponds showed strong positive association with rainfall, followed by high shrub mortality after an extremely wet summer. This likely resulted from waterlogging due to thermokarst. Synthesis. Our findings imply that the response of shrub growth to changes in Arctic precipitation regimes is regulated by (i) macro- (kilometre-scale) and micro-topographical (metre-scale) gradients, (ii) colimitation between temperat
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- 2023
7. Tundra Browning in the Indigirka Lowlands (North-Eastern Siberia) Explained by Drought, Floods and Small-Scale Vegetation Shifts
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Magnússon, Rúna, Groten, Finn, Bartholomeus, Harm, van Huissteden, Ko, Heijmans, Monique M.P.D., Magnússon, Rúna, Groten, Finn, Bartholomeus, Harm, van Huissteden, Ko, and Heijmans, Monique M.P.D.
- Abstract
Contrary to the general “greening of the Arctic”, the Siberian Indigirka Lowlands show strong “browning” (a decrease in the Normalized Difference Vegetation Index or “NDVI”) in various recent satellite records. Since greening and browning are generally indicative of increases and losses in photosynthetically active biomass, this browning trend may have implications for the carbon balance and vegetation of this Arctic tundra region. To explore potential mechanisms responsible for this trend break from general Arctic greening, we studied timeseries of Landsat summer maximum NDVI, weather data, and high-resolution maps of vegetation compositional change, topography, geomorphology and hydrology. We find that a significant proportion of browning (lower summer NDVI) is explained by moisture dynamics, with high snow depths and resulting floods as well as summer drought coinciding with low NDVI. Relations between seasonal weather variables and NDVI are spatially heterogeneous, with floodplains, drained thaw lake basins and Yedoma ridges showing different patterns of association with weather variables. Low summer NDVI after high snowfall was particularly evident in floodplains, likely explained by early summer floods. Local small-scale vegetation changes explained only small amounts of variance in browning rates in Landsat NDVI. Local expansion of Sphagnum vegetation in particular may have contributed to recent browning of our study site, but higher resolution NDVI timeseries are necessary to accurately constrain the role of small-scale vegetation shifts. Overall, associations identified in this study suggest that future increases in Arctic precipitation variability and extremes may limit tundra greening, but to different extents even across comparatively small topographical contrasts.
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- 2023
8. Peatland-VU-NUCOM (PVN 1.0) : Using dynamic plant functional types to model peatland vegetation, CH4, and CO2 emissions
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Lippmann, Tanya J.R., van der Velde, Ype, Heijmans, Monique M.P.D., Dolman, Han, Hendriks, Dimmie M.D., Van Huissteden, Ko, Lippmann, Tanya J.R., van der Velde, Ype, Heijmans, Monique M.P.D., Dolman, Han, Hendriks, Dimmie M.D., and Van Huissteden, Ko
- Abstract
Despite covering only 3% of the planet's land surface, peatlands store 30% of the planet's terrestrial carbon. The net greenhouse gas (GHG) emissions from peatlands depend on many factors but primarily soil temperature, vegetation composition, water level and drainage, and land management. However, many peatland models rely on water levels to estimate CH4 exchange, neglecting to consider the role of CH4 transported to the atmosphere by vegetation. To assess the impact of vegetation on the GHG fluxes of peatlands, we have developed a new model, Peatland-VU-NUCOM (PVN). The PVN model is a site-specific peatland CH4 and CO2 emissions model, able to reproduce vegetation dynamics. To represent dynamic vegetation, we have introduced plant functional types and competition, adapted from the NUCOM-BOG model, into the framework of the Peatland-VU model, a peatland GHG emissions model. The new PVN model includes plant competition, CH4 diffusion, ebullition, root, shoot, litter, exudate production, belowground decomposition, and aboveground moss development under changing water levels and climatic conditions. Here, we present the PVN model structure and explore the model's sensitivity to environmental input data and the introduction of the new vegetation competition schemes. We evaluate the model against observed chamber data collected at two peatland sites in the Netherlands to show that the model is able to reproduce realistic plant biomass fractions and daily CH4 and CO2 fluxes. We find that daily air temperature, water level, harvest frequency and height, and vegetation composition drive CH4 and CO2 emissions. We find that this process-based model is suitable to be used to simulate peatland vegetation dynamics and CH4 and CO2 emissions.
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- 2023
9. Extremely wet summer events enhance permafrost thaw for multiple years in Siberian tundra
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Magnússon, Rúna, Hamm, Alexandra, Karsanaev, Sergey V., Limpens, Juul, Kleijn, David, Frampton, Andrew, Maximov, Trofim C., Heijmans, Monique M.P.D., Magnússon, Rúna, Hamm, Alexandra, Karsanaev, Sergey V., Limpens, Juul, Kleijn, David, Frampton, Andrew, Maximov, Trofim C., and Heijmans, Monique M.P.D.
- Abstract
Permafrost thaw can accelerate climate warming by releasing carbon from previously frozen soil in the form of greenhouse gases. Rainfall extremes have been proposed to increase permafrost thaw, but the magnitude and duration of this effect are poorly understood. Here we present empirical evidence showing that one extremely wet summer (+100 mm; 120% increase relative to average June–August rainfall) enhanced thaw depth by up to 35% in a controlled irrigation experiment in an ice-rich Siberian tundra site. The effect persisted over two subsequent summers, demonstrating a carry-over effect of extremely wet summers. Using soil thermal hydrological modelling, we show that rainfall extremes delayed autumn freeze-up and rainfall-induced increases in thaw were most pronounced for warm summers with mid-summer precipitation rainfall extremes. Our results suggest that, with rainfall and temperature both increasing in the Arctic, permafrost will likely degrade and disappear faster than is currently anticipated based on rising air temperatures alone.
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- 2022
10. Decreased summer water table depth affects peatland vegetation
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Breeuwer, Angela, Robroek, Bjorn J.M., Limpens, Juul, Heijmans, Monique M.P.D., Schouten, Matthijs G.C., and Berendse, Frank
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- 2009
- Full Text
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11. Dataset for: 'Shrub decline and expansion of wetland vegetation revealed by very high resolution land cover change detection in the Siberian lowland tundra'
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Magnússon, Rúna, Heijmans, Monique M.P.D., Magnússon, Rúna, and Heijmans, Monique M.P.D.
- Abstract
Input materials, scripts and results for: - Trend analyses in MODIS Enhanced Vegetation Index for 2000-2019 in the Indigirka Lowlands, Sakha Republic, Russian federation. - Land Cover Change Detection of Vegetation Functional Groups in an Arcitc tundra site using very high resolution (0.5) satellite images in a focus area in the Kytalyk Reserve, Indigirka Lowlands over the period 2010-2019., Input materials, scripts and results for: - Trend analyses in MODIS Enhanced Vegetation Index for 2000-2019 in the Indigirka Lowlands, Sakha Republic, Russian federation. - Land Cover Change Detection of Vegetation Functional Groups in an Arcitc tundra site using very high resolution (0.5) satellite images in a focus area in the Kytalyk Reserve, Indigirka Lowlands over the period 2010-2019.
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- 2021
12. Shallow soils are warmer under trees and tall shrubs across Arctic and Boreal ecosystems
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Kropp, Heather, Loranty, Michael M., Natali, Susan M., Kholodov, Alexander L., Rocha, Adrian V., Myers-Smith, Isla, Abbot, Benjamin W., Abermann, Jakob, Blanc-Betes, Elena, Blok, Daan, Blume-Werry, Gesche, Boike, Julia, Breen, Amy L., Cahoon, Sean M.P., Christiansen, Casper T., Douglas, Thomas A., Epstein, Howard E., Frost, Gerald V., Goeckede, Mathias, Hoye, Toke T., Mamet, Steven D., O'Donnell, Jonathan A., Olefeldt, David, Phoenix, Gareth K., Salmon, Verity G., Sannel, Britta K., Smith, Sharon L., Sonnentag, Oliver, Vaughn, Lydia Smith, Williams, Mathew, Elberling, Bo, Gough, Laura, Hjort, Jan, Lafleur, Peter M., Euskirchen, Eugenie S., Heijmans, Monique M.P.D., Humphreys, Elyn R., Iwata, Hiroki, Jones, Benjamin M., Jorgenson, Torre, Grünberg, Inge, Kim, Yongwon, Mauritz, Marguerite, Michelsen, Anders, Schaepman-Strub, Gabriela, Tape, Ken D., Ueyama, Masahito, Lee, Bang Yong, Langley, Kirsty, Lund, Magnus, Kropp, Heather, Loranty, Michael M., Natali, Susan M., Kholodov, Alexander L., Rocha, Adrian V., Myers-Smith, Isla, Abbot, Benjamin W., Abermann, Jakob, Blanc-Betes, Elena, Blok, Daan, Blume-Werry, Gesche, Boike, Julia, Breen, Amy L., Cahoon, Sean M.P., Christiansen, Casper T., Douglas, Thomas A., Epstein, Howard E., Frost, Gerald V., Goeckede, Mathias, Hoye, Toke T., Mamet, Steven D., O'Donnell, Jonathan A., Olefeldt, David, Phoenix, Gareth K., Salmon, Verity G., Sannel, Britta K., Smith, Sharon L., Sonnentag, Oliver, Vaughn, Lydia Smith, Williams, Mathew, Elberling, Bo, Gough, Laura, Hjort, Jan, Lafleur, Peter M., Euskirchen, Eugenie S., Heijmans, Monique M.P.D., Humphreys, Elyn R., Iwata, Hiroki, Jones, Benjamin M., Jorgenson, Torre, Grünberg, Inge, Kim, Yongwon, Mauritz, Marguerite, Michelsen, Anders, Schaepman-Strub, Gabriela, Tape, Ken D., Ueyama, Masahito, Lee, Bang Yong, Langley, Kirsty, and Lund, Magnus
- Abstract
Soils are warming as air temperatures rise across the Arctic and Boreal region concurrent with the expansion of tall-statured shrubs and trees in the tundra. Changes in vegetation structure and function are expected to alter soil thermal regimes, thereby modifying climate feedbacks related to permafrost thaw and carbon cycling. However, current understanding of vegetation impacts on soil temperature is limited to local or regional scales and lacks the generality necessary to predict soil warming and permafrost stability on a pan-Arctic scale. Here we synthesize shallow soil and air temperature observations with broad spatial and temporal coverage collected across 106 sites representing nine different vegetation types in the permafrost region. We showed ecosystems with tall-statured shrubs and trees (>40 cm) have warmer shallow soils than those with short-statured tundra vegetation when normalized to a constant air temperature. In tree and tall shrub vegetation types, cooler temperatures in the warm season do not lead to cooler mean annual soil temperature indicating that ground thermal regimes in the cold-season rather than the warm-season are most critical for predicting soil warming in ecosystems underlain by permafrost. Our results suggest that the expansion of tall shrubs and trees into tundra regions can amplify shallow soil warming, and could increase the potential for increased seasonal thaw depth and increase soil carbon cycling rates and lead to increased carbon dioxide loss and further permafrost thaw.
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- 2021
13. Shrub decline and expansion of wetland vegetation revealed by very high resolution land cover change detection in the Siberian lowland tundra
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Magnússon, Rúna, Limpens, Juul, Kleijn, David, van Huissteden, Ko, Maximov, Trofim C., Lobry, Sylvain, Heijmans, Monique M.P.D., Magnússon, Rúna, Limpens, Juul, Kleijn, David, van Huissteden, Ko, Maximov, Trofim C., Lobry, Sylvain, and Heijmans, Monique M.P.D.
- Abstract
Vegetation change, permafrost degradation and their interactions affect greenhouse gas fluxes, hydrology and surface energy balance in Arctic ecosystems. The Arctic shows an overall “greening” trend (i.e. increased plant biomass and productivity) attributed to expansion of shrub vegetation. However, Arctic shrub dynamics show strong spatial variability and locally “browning” may be observed. Mechanistic understanding of greening and browning trends is necessary to accurately assess the response of Arctic vegetation to a changing climate. In this context, the Siberian Arctic is an understudied region. Between 2010 and 2019, increased browning (as derived from the MODIS Enhanced Vegetation Index) was observed in the Eastern Siberian Indigirka Lowlands. To support interpretation of local greening and browning dynamics, we quantified changes in land cover and transition probabilities in a representative tundra site in the Indigirka Lowlands using a timeseries of three very high resolution (VHR) (0.5 m) satellite images acquired between 2010 and 2019. Using spatiotemporal Potts model regularization, we substantially reduced classification errors related to optical and phenological inconsistencies in the image material. VHR images show that recent browning was associated with declines in shrub, lichen and tussock vegetation and increases in open water, sedge and especially Sphagnum vegetation. Observed formation and expansion of small open water bodies in shrub dominated vegetation suggests abrupt thaw of ice-rich permafrost. Transitions from open water to sedge and Sphagnum, indicate aquatic succession upon disturbance. The overall shift towards open water and wetland vegetation suggests a wetting trend, likely associated with permafrost degradation. Landsat data confirmed widespread expansion of surface water throughout the Indigirka Lowlands. However, the increase in the area of small water bodies observed in VHR data was not visible in Landsat-derived surface water da
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- 2021
14. Plant trait response of tundra shrubs to permafrost thaw and nutrient addition
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Iturrate-Garcia, Maitane, Heijmans, Monique M.P.D., Cornelissen, L.H.C., Schweingruber, Fritz H., Niklaus, Pascal A., Schaepman-Strub, Gabriela, Iturrate-Garcia, Maitane, Heijmans, Monique M.P.D., Cornelissen, L.H.C., Schweingruber, Fritz H., Niklaus, Pascal A., and Schaepman-Strub, Gabriela
- Abstract
Plant traits reflect growth strategies and trade-offs in response to environmental conditions. Because of climate warming, plant traits might change, altering ecosystem functions and vegetation-climate interactions. Despite important feedbacks of plant trait changes in tundra ecosystems with regional climate, with a key role for shrubs, information on responses of shrub functional traits is limited. Here, we investigate the effects of experimentally increased permafrost thaw depth and (possibly thawassociated) soil nutrient availability on plant functional traits and strategies of Arctic shrubs in northeastern Siberia. We hypothesize that shrubs will generally shift their strategy from efficient conservation to faster acquisition of resources through adaptation of leaf and stem traits in a coordinated whole-plant fashion. To test this hypothesis, we ran a 4 year permafrost thaw and nutrient fertilization experiment with a fully factorial block design and six treatment combinations - permafrost thaw (control, unheated cable, heated cable) fertilization (no nutrient addition, nutrient addition). We measured 10 leaf and stem traits related to growth, defence and the resource economics spectrum in four shrub species (Betula nana, Salix pulchra, Ledum palustre and Vaccinium vitis-idaea), which were sampled in the experimental plots. The plant trait data were statistically analysed using linear mixed-effect models and principal component analysis (PCA). The response to increased permafrost thaw was not significant for most shrub traits. However, all shrubs responded to the fertilization treatment, despite decreased thaw depth and soil temperature in fertilized plots. Shrubs tended to grow taller but did not increase their stem density or bark thickness. We found a similar coordinated trait response for all four species at leaf and plant level; i.e. they shifted from a conservative towards a more acquisitive resource economy strategy upon fertilization. In accordance, resu
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- 2020
15. Carbon dioxide and water vapour exchange from understory species in boreal forest
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Heijmans, Monique M.P.D., Arp, Wim J., and Chapin, F.Stuart, III
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- 2004
- Full Text
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16. Tundra Trait Team : A database of plant traits spanning the tundra biome
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Bjorkman, Anne D., Myers-Smith, Isla H., Elmendorf, Sarah C., Normand, Signe, Thomas, Haydn J.D., Alatalo, Juha M., Alexander, Heather, Anadon-Rosell, Alba, Angers-Blondin, Sandra, Bai, Yang, Baruah, Gaurav, te Beest, Mariska, Berner, Logan, Björk, Robert G., Blok, Daan, Bruelheide, Helge, Buchwal, Agata, Buras, Allan, Carbognani, Michele, Christie, Katherine, Collier, Laura S., Cooper, Elisabeth J., Cornelissen, J.H.C., Dickinson, Katharine J.M., Dullinger, Stefan, Elberling, Bo, Eskelinen, Anu, Forbes, Bruce C., Frei, Esther R., Iturrate-Garcia, Maitane, Good, Megan K., Grau, Oriol, Green, Peter, Greve, Michelle, Grogan, Paul, Haider, Sylvia, Hájek, Tomáš, Hallinger, Martin, Happonen, Konsta, Harper, Karen A., Heijmans, Monique M.P.D., Henry, Gregory H.R., Hermanutz, Luise, Hewitt, Rebecca E., Hollister, Robert D., Hudson, James, Hülber, Karl, Iversen, Colleen M., Jaroszynska, Francesca, and Jiménez-Alfaro, Borja
- Subjects
WIMEK ,Arctic ,plant functional traits ,tundra ,alpine ,Plantenecologie en Natuurbeheer ,Plant Ecology and Nature Conservation ,Bosecologie en Bosbeheer ,Forest Ecology and Forest Management ,OT PB Vredepeel - Abstract
Motivation: The Tundra Trait Team (TTT) database includes field-based measurements of key traits related to plant form and function at multiple sites across the tundra biome. This dataset can be used to address theoretical questions about plant strategy and trade-offs, trait–environment relationships and environmental filtering, and trait variation across spatial scales, to validate satellite data, and to inform Earth system model parameters. Main types of variable contained: The database contains 91,970 measurements of 18 plant traits. The most frequently measured traits (> 1,000 observations each) include plant height, leaf area, specific leaf area, leaf fresh and dry mass, leaf dry matter content, leaf nitrogen, carbon and phosphorus content, leaf C:N and N:P, seed mass, and stem specific density. Spatial location and grain: Measurements were collected in tundra habitats in both the Northern and Southern Hemispheres, including Arctic sites in Alaska, Canada, Greenland, Fennoscandia and Siberia, alpine sites in the European Alps, Colorado Rockies, Caucasus, Ural Mountains, Pyrenees, Australian Alps, and Central Otago Mountains (New Zealand), and sub-Antarctic Marion Island. More than 99% of observations are georeferenced. Time period and grain: All data were collected between 1964 and 2018. A small number of sites have repeated trait measurements at two or more time periods. Major taxa and level of measurement: Trait measurements were made on 978 terrestrial vascular plant species growing in tundra habitats. Most observations are on individuals (86%), while the remainder represent plot or site means or maximums per species. Software format: csv file and GitHub repository with data cleaning scripts in R; contribution to TRY plant trait database (www.try-db.org) to be included in the next version release.
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- 2018
17. Depth-based differentiation in nitrogen uptake between graminoids and shrubs in an Arctic tundra plant community
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Wang, P., Limpens, Juul, Nauta, Ake, Huissteden, Corine van, Rijssel, Sophie Quirina van, Mommer, Liesje, Kroon, Hans de, Maximov, Trofim C., Heijmans, Monique M.P.D., Wang, P., Limpens, Juul, Nauta, Ake, Huissteden, Corine van, Rijssel, Sophie Quirina van, Mommer, Liesje, Kroon, Hans de, Maximov, Trofim C., and Heijmans, Monique M.P.D.
- Abstract
Contains fulltext : 184164.pdf (publisher's version ) (Closed access)
- Published
- 2018
18. Plant functional trait change across a warming tundra biome
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Bjorkman, Anne D., Myers-Smith, Isla H., Elmendorf, Sarah C., Normand, Signe, Rüger, Nadja, Beck, Pieter S.A., Blach-Overgaard, Anne, Blok, Daan, Cornelissen, J. Hans C., Forbes, Bruce C., Georges, Damien, Goetz, Scott J., Guay, Kevin C., Henry, Gregory H.R., HilleRisLambers, Janneke, Hollister, Robert D., Karger, Dirk N., Kattge, Jens, Manning, Peter, Prevéy, Janet S., Rixen, Christian, Schaepman-Strub, Gabriela, Thomas, Haydn J.D., Vellend, Mark, Wilmking, Martin, Wipf, Sonja, Carbognani, Michele, Hermanutz, Luise, Lévesque, Esther, Molau, Ulf, Petraglia, Alessandro, Soudzilovskaia, Nadejda A., Spasojevic, Marko J., Tomaselli, Marcello, Vowles, Tage, Alatalo, Juha M., Alexander, Heather D., Anadon-Rosell, Alba, Angers-Blondin, Sandra, Beest, Mariska te, Berner, Logan, Björk, Robert G., Buchwal, Agata, Buras, Allan, Christie, Katherine, Cooper, Elisabeth J., Dullinger, Stefan, Elberling, Bo, Eskelinen, Anu, Frei, Esther R., Grau, Oriol, Grogan, Paul, Hallinger, Martin, Harper, Karen A., Heijmans, Monique M.P.D., Hudson, James, Hülber, Karl, Iturrate-Garcia, Maitane, Iversen, Colleen M., Jaroszynska, Francesca, Johnstone, Jill F., Jørgensen, Rasmus Halfdan, Kaarlejärvi, Elina, Klady, Rebecca, Kuleza, Sara, Kulonen, Aino, Lamarque, Laurent J., Lantz, Trevor, Little, Chelsea J., Speed, James D.M., Michelsen, Anders, Milbau, Ann, Nabe-Nielsen, Jacob, Nielsen, Sigrid Schøler, Ninot, Josep M., Oberbauer, Steven F., Olofsson, Johan, Onipchenko, Vladimir G., Rumpf, Sabine B., Semenchuk, Philipp, Shetti, Rohan, Collier, Laura Siegwart, Street, Lorna E., Suding, Katharine N., Tape, Ken D., Trant, Andrew, Treier, Urs A., Tremblay, Jean Pierre, Tremblay, Maxime, Venn, Susanna, Weijers, Stef, Zamin, Tara, Boulanger-Lapointe, Noémie, Gould, William A., Hik, David S., Hofgaard, Annika, Jónsdóttir, Ingibjörg S., Jorgenson, Janet, Klein, Julia, Magnusson, Borgthor, Tweedie, Craig, Wookey, Philip A., Bahn, Michael, Blonder, Benjamin, van Bodegom, Peter M., Bond-Lamberty, Benjamin, Campetella, Giandiego, Cerabolini, Bruno E.L., Chapin, F. Stuart, Cornwell, William K., Craine, Joseph, Dainese, Matteo, de Vries, Franciska T., Díaz, Sandra, Enquist, Brian J., Green, Walton, Milla, Ruben, Niinemets, Ülo, Onoda, Yusuke, Ordoñez, Jenny C., Ozinga, Wim A., Penuelas, Josep, Poorter, Hendrik, Poschlod, Peter, Reich, Peter B., Sandel, Brody, Schamp, Brandon, Sheremetev, Serge, Weiher, Evan, Bjorkman, Anne D., Myers-Smith, Isla H., Elmendorf, Sarah C., Normand, Signe, Rüger, Nadja, Beck, Pieter S.A., Blach-Overgaard, Anne, Blok, Daan, Cornelissen, J. Hans C., Forbes, Bruce C., Georges, Damien, Goetz, Scott J., Guay, Kevin C., Henry, Gregory H.R., HilleRisLambers, Janneke, Hollister, Robert D., Karger, Dirk N., Kattge, Jens, Manning, Peter, Prevéy, Janet S., Rixen, Christian, Schaepman-Strub, Gabriela, Thomas, Haydn J.D., Vellend, Mark, Wilmking, Martin, Wipf, Sonja, Carbognani, Michele, Hermanutz, Luise, Lévesque, Esther, Molau, Ulf, Petraglia, Alessandro, Soudzilovskaia, Nadejda A., Spasojevic, Marko J., Tomaselli, Marcello, Vowles, Tage, Alatalo, Juha M., Alexander, Heather D., Anadon-Rosell, Alba, Angers-Blondin, Sandra, Beest, Mariska te, Berner, Logan, Björk, Robert G., Buchwal, Agata, Buras, Allan, Christie, Katherine, Cooper, Elisabeth J., Dullinger, Stefan, Elberling, Bo, Eskelinen, Anu, Frei, Esther R., Grau, Oriol, Grogan, Paul, Hallinger, Martin, Harper, Karen A., Heijmans, Monique M.P.D., Hudson, James, Hülber, Karl, Iturrate-Garcia, Maitane, Iversen, Colleen M., Jaroszynska, Francesca, Johnstone, Jill F., Jørgensen, Rasmus Halfdan, Kaarlejärvi, Elina, Klady, Rebecca, Kuleza, Sara, Kulonen, Aino, Lamarque, Laurent J., Lantz, Trevor, Little, Chelsea J., Speed, James D.M., Michelsen, Anders, Milbau, Ann, Nabe-Nielsen, Jacob, Nielsen, Sigrid Schøler, Ninot, Josep M., Oberbauer, Steven F., Olofsson, Johan, Onipchenko, Vladimir G., Rumpf, Sabine B., Semenchuk, Philipp, Shetti, Rohan, Collier, Laura Siegwart, Street, Lorna E., Suding, Katharine N., Tape, Ken D., Trant, Andrew, Treier, Urs A., Tremblay, Jean Pierre, Tremblay, Maxime, Venn, Susanna, Weijers, Stef, Zamin, Tara, Boulanger-Lapointe, Noémie, Gould, William A., Hik, David S., Hofgaard, Annika, Jónsdóttir, Ingibjörg S., Jorgenson, Janet, Klein, Julia, Magnusson, Borgthor, Tweedie, Craig, Wookey, Philip A., Bahn, Michael, Blonder, Benjamin, van Bodegom, Peter M., Bond-Lamberty, Benjamin, Campetella, Giandiego, Cerabolini, Bruno E.L., Chapin, F. Stuart, Cornwell, William K., Craine, Joseph, Dainese, Matteo, de Vries, Franciska T., Díaz, Sandra, Enquist, Brian J., Green, Walton, Milla, Ruben, Niinemets, Ülo, Onoda, Yusuke, Ordoñez, Jenny C., Ozinga, Wim A., Penuelas, Josep, Poorter, Hendrik, Poschlod, Peter, Reich, Peter B., Sandel, Brody, Schamp, Brandon, Sheremetev, Serge, and Weiher, Evan
- Abstract
The tundra is warming more rapidly than any other biome on Earth, and the potential ramifications are far-reaching because of global feedback effects between vegetation and climate. A better understanding of how environmental factors shape plant structure and function is crucial for predicting the consequences of environmental change for ecosystem functioning. Here we explore the biome-wide relationships between temperature, moisture and seven key plant functional traits both across space and over three decades of warming at 117 tundra locations. Spatial temperature–trait relationships were generally strong but soil moisture had a marked influence on the strength and direction of these relationships, highlighting the potentially important influence of changes in water availability on future trait shifts in tundra plant communities. Community height increased with warming across all sites over the past three decades, but other traits lagged far behind predicted rates of change. Our findings highlight the challenge of using space-for-time substitution to predict the functional consequences of future warming and suggest that functions that are tied closely to plant height will experience the most rapid change. They also reveal the strength with which environmental factors shape biotic communities at the coldest extremes of the planet and will help to improve projections of functional changes in tundra ecosystems with climate warming.
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- 2018
- Full Text
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19. Tundra Trait Team:A database of plant traits spanning the tundra biome
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Bjorkman, Anne D., Myers-Smith, Isla H., Elmendorf, Sarah C., Normand, Signe, Thomas, Haydn J.D., Alatalo, Juha M., Alexander, Heather, Anadon-Rosell, Alba, Angers-Blondin, Sandra, Bai, Yang, Baruah, Gaurav, te Beest, Mariska, Berner, Logan, Björk, Robert G., Blok, Daan, Bruelheide, Helge, Buchwal, Agata, Buras, Allan, Carbognani, Michele, Christie, Katherine, Collier, Laura S., Cooper, Elisabeth J., Cornelissen, J. Hans C., Dickinson, Katharine J.M., Dullinger, Stefan, Elberling, Bo, Eskelinen, Anu, Forbes, Bruce C., Frei, Esther R., Iturrate-Garcia, Maitane, Good, Megan K., Grau, Oriol, Green, Peter, Greve, Michelle, Grogan, Paul, Haider, Sylvia, Hájek, Tomáš, Hallinger, Martin, Happonen, Konsta, Harper, Karen A., Heijmans, Monique M.P.D., Henry, Gregory H.R., Hermanutz, Luise, Hewitt, Rebecca E., Hollister, Robert D., Hudson, James, Hülber, Karl, Iversen, Colleen M., Jaroszynska, Francesca, Jiménez-Alfaro, Borja, Johnstone, Jill, Jorgensen, Rasmus Halfdan, Kaarlejärvi, Elina, Klady, Rebecca, Klimešová, Jitka, Korsten, Annika, Kuleza, Sara, Kulonen, Aino, Lamarque, Laurent J., Lantz, Trevor, Lavalle, Amanda, Lembrechts, Jonas J., Lévesque, Esther, Little, Chelsea J., Luoto, Miska, Macek, Petr, Mack, Michelle C., Mathakutha, Rabia, Michelsen, Anders, Milbau, Ann, Molau, Ulf, Morgan, John W., Mörsdorf, Martin Alfons, Nabe-Nielsen, Jacob, Nielsen, Sigrid Schøler, Ninot, Josep M., Oberbauer, Steven F., Olofsson, Johan, Onipchenko, Vladimir G., Petraglia, Alessandro, Pickering, Catherine, Prevéy, Janet S., Rixen, Christian, Rumpf, Sabine B., Schaepman-Strub, Gabriela, Semenchuk, Philipp, Shetti, Rohan, Soudzilovskaia, Nadejda A., Spasojevic, Marko J., Speed, James David Mervyn, Street, Lorna E., Suding, Katharine, Tape, Ken D., Tomaselli, Marcello, Trant, Andrew, Treier, Urs A., Tremblay, Jean Pierre, Tremblay, Maxime, Venn, Susanna, Virkkala, Anna Maria, Vowles, Tage, Weijers, Stef, Wilmking, Martin, Wipf, Sonja, Zamin, Tara, Bjorkman, Anne D., Myers-Smith, Isla H., Elmendorf, Sarah C., Normand, Signe, Thomas, Haydn J.D., Alatalo, Juha M., Alexander, Heather, Anadon-Rosell, Alba, Angers-Blondin, Sandra, Bai, Yang, Baruah, Gaurav, te Beest, Mariska, Berner, Logan, Björk, Robert G., Blok, Daan, Bruelheide, Helge, Buchwal, Agata, Buras, Allan, Carbognani, Michele, Christie, Katherine, Collier, Laura S., Cooper, Elisabeth J., Cornelissen, J. Hans C., Dickinson, Katharine J.M., Dullinger, Stefan, Elberling, Bo, Eskelinen, Anu, Forbes, Bruce C., Frei, Esther R., Iturrate-Garcia, Maitane, Good, Megan K., Grau, Oriol, Green, Peter, Greve, Michelle, Grogan, Paul, Haider, Sylvia, Hájek, Tomáš, Hallinger, Martin, Happonen, Konsta, Harper, Karen A., Heijmans, Monique M.P.D., Henry, Gregory H.R., Hermanutz, Luise, Hewitt, Rebecca E., Hollister, Robert D., Hudson, James, Hülber, Karl, Iversen, Colleen M., Jaroszynska, Francesca, Jiménez-Alfaro, Borja, Johnstone, Jill, Jorgensen, Rasmus Halfdan, Kaarlejärvi, Elina, Klady, Rebecca, Klimešová, Jitka, Korsten, Annika, Kuleza, Sara, Kulonen, Aino, Lamarque, Laurent J., Lantz, Trevor, Lavalle, Amanda, Lembrechts, Jonas J., Lévesque, Esther, Little, Chelsea J., Luoto, Miska, Macek, Petr, Mack, Michelle C., Mathakutha, Rabia, Michelsen, Anders, Milbau, Ann, Molau, Ulf, Morgan, John W., Mörsdorf, Martin Alfons, Nabe-Nielsen, Jacob, Nielsen, Sigrid Schøler, Ninot, Josep M., Oberbauer, Steven F., Olofsson, Johan, Onipchenko, Vladimir G., Petraglia, Alessandro, Pickering, Catherine, Prevéy, Janet S., Rixen, Christian, Rumpf, Sabine B., Schaepman-Strub, Gabriela, Semenchuk, Philipp, Shetti, Rohan, Soudzilovskaia, Nadejda A., Spasojevic, Marko J., Speed, James David Mervyn, Street, Lorna E., Suding, Katharine, Tape, Ken D., Tomaselli, Marcello, Trant, Andrew, Treier, Urs A., Tremblay, Jean Pierre, Tremblay, Maxime, Venn, Susanna, Virkkala, Anna Maria, Vowles, Tage, Weijers, Stef, Wilmking, Martin, Wipf, Sonja, and Zamin, Tara
- Abstract
Motivation: The Tundra Trait Team (TTT) database includes field-based measurements of key traits related to plant form and function at multiple sites across the tundra biome. This dataset can be used to address theoretical questions about plant strategy and trade-offs, trait–environment relationships and environmental filtering, and trait variation across spatial scales, to validate satellite data, and to inform Earth system model parameters. Main types of variable contained: The database contains 91,970 measurements of 18 plant traits. The most frequently measured traits (> 1,000 observations each) include plant height, leaf area, specific leaf area, leaf fresh and dry mass, leaf dry matter content, leaf nitrogen, carbon and phosphorus content, leaf C:N and N:P, seed mass, and stem specific density. Spatial location and grain: Measurements were collected in tundra habitats in both the Northern and Southern Hemispheres, including Arctic sites in Alaska, Canada, Greenland, Fennoscandia and Siberia, alpine sites in the European Alps, Colorado Rockies, Caucasus, Ural Mountains, Pyrenees, Australian Alps, and Central Otago Mountains (New Zealand), and sub-Antarctic Marion Island. More than 99% of observations are georeferenced. Time period and grain: All data were collected between 1964 and 2018. A small number of sites have repeated trait measurements at two or more time periods. Major taxa and level of measurement: Trait measurements were made on 978 terrestrial vascular plant species growing in tundra habitats. Most observations are on individuals (86%), while the remainder represent plot or site means or maximums per species. Software format: csv file and GitHub repository with data cleaning scripts in R; contribution to TRY plant trait database (www.try-db.org) to be included in the next version release.
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- 2018
20. Depth‐based differentiation in nitrogen uptake between graminoids and shrubs in an Arctic tundra plant community
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Wang, Peng, primary, Limpens, Juul, additional, Nauta, Ake, additional, van Huissteden, Corine, additional, Quirina van Rijssel, Sophie, additional, Mommer, Liesje, additional, de Kroon, Hans, additional, Maximov, Trofim C., additional, and Heijmans, Monique M.P.D., additional
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- 2017
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21. Thaw pond development and initial vegetation succession in experimental plots at a Siberian lowland tundra site
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Li, Bingxi, Heijmans, Monique M.P.D., Blok, Daan, Wang, Peng, Karsanaev, Sergey V., Maximov, Trofim C., van Huissteden, Jacobus, Berendse, Frank, Li, Bingxi, Heijmans, Monique M.P.D., Blok, Daan, Wang, Peng, Karsanaev, Sergey V., Maximov, Trofim C., van Huissteden, Jacobus, and Berendse, Frank
- Abstract
Background and aims: Permafrost degradation has the potential to change the Arctic tundra landscape. We observed rapid local thawing of ice-rich permafrost resulting in thaw pond formation, which was triggered by removal of the shrub cover in a field experiment. This study aimed to examine the rate of permafrost thaw and the initial vegetation succession after the permafrost collapse. Methods: In the experiment, we measured changes in soil thaw depth, plant species cover and soil subsidence over nine years (2007–2015). Results: After abrupt initial thaw, soil subsidence in the removal plots continued indicating further thawing of permafrost albeit at a much slower pace: 1 cm y−1 over 2012–2015 vs. 5 cm y−1 over 2007–2012. Grass cover strongly increased after the initial shrub removal, but later declined with ponding of water in the subsiding removal plots. Sedges established and expanded in the wetter removal plots. Thereby, the removal plots have become increasingly similar to nearby ‘natural’ thaw ponds. Conclusions: The nine years of field observations in a unique shrub removal experiment at a Siberian tundra site document possible trajectories of small-scale permafrost collapse and the initial stage of vegetation recovery, which is essential knowledge for assessing future tundra landscape changes.
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- 2017
22. Contrasting radiation and soil heat fluxes in Arctic shrub and wet sedge tundra
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Juszak, Inge, Eugster, Werner, Heijmans, Monique M.P.D., Schaepman-Strub, Gabriela, Juszak, Inge, Eugster, Werner, Heijmans, Monique M.P.D., and Schaepman-Strub, Gabriela
- Abstract
Vegetation changes, such as shrub encroachment and wetland expansion, have been observed in many Arctic tundra regions. These changes feed back to permafrost and climate. Permafrost can be protected by soil shading through vegetation as it reduces the amount of solar energy available for thawing. Regional climate can be affected by a reduction in surface albedo as more energy is available for atmospheric and soil heating. Here, we compared the shortwave radiation budget of two common Arctic tundra vegetation types dominated by dwarf shrubs (Betula nana) and wet sedges (Eriophorum angustifolium) in North-East Siberia. We measured time series of the shortwave and longwave radiation budget above the canopy and transmitted radiation below the canopy. Additionally, we quantified soil temperature and heat flux as well as active layer thickness. The mean growing season albedo of dwarf shrubs was 0:15±0:01, for sedges it was higher (0:17±0:02). Dwarf shrub transmittance was 0:36±0:07 on average, and sedge transmittance was 0:28±0:08. The standing dead leaves contributed strongly to the soil shading of wet sedges. Despite a lower albedo and less soil shading, the soil below dwarf shrubs conducted less heat resulting in a 17cm shallower active layer as compared to sedges. This result was supported by additional, spatially distributed measurements of both vegetation types. Clouds were a major influencing factor for albedo and transmittance, particularly in sedge vegetation. Cloud cover reduced the albedo by 0.01 in dwarf shrubs and by 0.03 in sedges, while transmittance was increased by 0.08 and 0.10 in dwarf shrubs and sedges, respectively. Our results suggest that the observed deeper active layer below wet sedges is not primarily a result of the summer canopy radiation budget. Soil properties, such as soil albedo, moisture, and thermal conductivity, may be more influential, at least in our comparison between dwarf shrub vegetation on relatively dry patches and sedge vegetati
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- 2016
23. Long-term effects of climate change on vegetation and carbon dynamics in peat bogs
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Heijmans, Monique M.P.D., primary, Mauquoy, Dmitri, additional, van Geel, Bas, additional, and Berendse, Frank, additional
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- 2008
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24. Competition between Sphagnum magellanicum and Eriophorum angustifolium as affected by raised CO2 and increased N deposition.
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Heijmans, Monique M.P.D., Klees, Herman, and Berendse, Frank
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PEAT mosses , *ERIOPHORUM angustifolium , *PHYSIOLOGICAL effects of carbon dioxide , *NITROGEN - Abstract
Investigates the competition between Sphagnum magellanicum and Eriophorum angustifolium affected by raised CO[sub 2] and increased N deposition. Outcome of glasshouse experiment; Decrease in nutrient availability; Impact of nitrogen addition.
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- 2002
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25. Effects of elevated CO2 and vascular plants on evapotranspiration in bog vegetation.
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Heijmans, Monique M.P.D., Arp, Wim J., and Berendse, Frank
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EVAPOTRANSPIRATION , *BOGS , *ATMOSPHERIC carbon dioxide , *NITROGEN - Abstract
Studies the effects of atmospheric carbon dioxide and nitrogen deposition on evapotranspiration in bog vegetation. Water use of bog vegetation; Vascular plant biomass; Relationship between vascular plant abundance and evapotranspiration.
- Published
- 2001
- Full Text
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