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4. Global Patterns of Foliar Nitrogen Isotopes and Their Relationships with Climate, Mycorrhizal Fungi, Foliar Nutrient Concentrations, and Nitrogen Availability

Author

Craine, Joseph M., Elmore, Andrew J., Aidar, Marcos P. M., Bustamante, Mercedes, Dawson, Todd E., Hobbie, Erik A., Kahmen, Ansgar, Mack, Michelle C., McLauchlan, Kendra K., Michelsen, Anders, Nardoto, Gabriela B., Pardo, Linda H., Peñuelas, Josep, Reich, Peter B., Schuur, Edward A. G., Stock, William D., Templer, Pamela H., Virginia, Ross A., Welker, Jeffrey M., and Wright, Ian J.

Published
2009
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7. LT‐Brazil: A database of leaf traits across biomes and vegetation types in Brazil

Author

Mariano, Eduardo, primary, Gomes, Taciana F., additional, Lins, Silvia R. M., additional, Abdalla‐Filho, Adibe L., additional, Soltangheisi, Amin, additional, Araújo, Maria G. S., additional, Almeida, Rodrigo F., additional, Augusto, Fernanda G., additional, Canisares, Luiza P., additional, Chaves, Siglea S. F., additional, Costa, Cristiane F. G., additional, Diniz‐Reis, Thaís R., additional, Galera, Leonardo A., additional, Martinez, Melissa G., additional, Morais, Maristela C., additional, Perez, Elen B., additional, Reis, Lucas C., additional, P. Simon, Carla, additional, Mardegan, Silvia F., additional, Domingues, Tomas F., additional, Miatto, Raquel C., additional, Oliveira, Rafael S., additional, Reis, Carla R. G., additional, Nardoto, Gabriela B., additional, Kattge, Jens, additional, Martinelli, Luiz A., additional, and Hampe, Arndt, additional

Published
2021
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9. Carbon and Beyond : The Biogeochemistry of Climate in a Rapidly Changing Amazon

Author

Covey, Kristofer, Soper, Fiona, Pangala, Sunitha, Bernardino, Angelo, Pagliaro, Zoe, Basso, Luana, Cassol, Henrique, Fearnside, Philip, Navarrete, Diego, Novoa, Sidney, Sawakuchi, Henrique, Lovejoy, Thomas, Marengo, Jose, Peres, Carlos A., Baillie, Jonathan, Bernasconi, Paula, Camargo, Jose, Freitas, Carolina, Hoffman, Bruce, Nardoto, Gabriela B., Nobre, Ismael, Mayorga, Juan, Mesquita, Rita, Pavan, Silvia, Pinto, Flavia, Rocha, Flavia, de Assis Mello, Ricardo, Thuault, Alice, Bahl, Alexis Anne, Elmore, Aurora, Covey, Kristofer, Soper, Fiona, Pangala, Sunitha, Bernardino, Angelo, Pagliaro, Zoe, Basso, Luana, Cassol, Henrique, Fearnside, Philip, Navarrete, Diego, Novoa, Sidney, Sawakuchi, Henrique, Lovejoy, Thomas, Marengo, Jose, Peres, Carlos A., Baillie, Jonathan, Bernasconi, Paula, Camargo, Jose, Freitas, Carolina, Hoffman, Bruce, Nardoto, Gabriela B., Nobre, Ismael, Mayorga, Juan, Mesquita, Rita, Pavan, Silvia, Pinto, Flavia, Rocha, Flavia, de Assis Mello, Ricardo, Thuault, Alice, Bahl, Alexis Anne, and Elmore, Aurora

Abstract

The Amazon Basin is at the center of an intensifying discourse about deforestation, land-use, and global change. To date, climate research in the Basin has overwhelmingly focused on the cycling and storage of carbon (C) and its implications for global climate. Missing, however, is a more comprehensive consideration of other significant biophysical climate feedbacks [i.e., CH4, N2O, black carbon, biogenic volatile organic compounds (BV0Cs), aerosols, evapotranspiration, and albedo] and their dynamic responses to both localized (fire, land-use change, infrastructure development, and storms) and global (warming, drying, and some related to El Nino or to warming in the tropical Atlantic) changes. Here, we synthesize the current understanding of (1) sources and fluxes of all major forcing agents, (2) the demonstrated or expected impact of global and local changes on each agent, and (3) the nature, extent, and drivers of anthropogenic change in the Basin. We highlight the large uncertainty in flux magnitude and responses, and their corresponding direct and indirect effects on the regional and global climate system. Despite uncertainty in their responses to change, we conclude that current warming from non-CO2 agents (especially CH4 and N2O) in the Amazon Basin largely offsets- and most likely exceeds-the climate service provided by atmospheric CO2 uptake. We also find that the majority of anthropogenic impacts act to increase the radiative forcing potential of the Basin. Given the large contribution of less-recognized agents (e.g., Amazonian trees alone emit similar to 3.5% of all global CH4), a continuing focus on a single metric (i.e., C uptake and storage) is incompatible with genuine efforts to understand and manage the biogeochemistry of climate in a rapidly changing Amazon Basin., Funding Agencies|National Geographic SocietyNational Geographic Society; Rolex partnership; National Geographic Society research grantNational Geographic Society; FAPESPFundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2018/14006-4, 2018/14423-4, 2014/508489]; National Coordination for High Level Education and Training (CAPES) [88887.136402-00INCT]; National Institute of Science and Technology for Climate Change Phase 2 (CNPq) [465501/2014-1]; CNPqNational Council for Scientific and Technological Development (CNPq) [311103/2015-4, 429795/2016-5]; FAPEAM [708565]; INPA [PRJ15.125]; Rede Clima (INPE) FINEP [01.13.0353-00]

Published
2021
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10. A feather hydrogen (δ2H) isoscape for Brazil.

Author

Alquezar, Renata D., Costa, Fabio J. V., Sena-Souza, João Paulo, Nardoto, Gabriela B., and Hobson, Keith A.

Subjects
FEATHERS, HYDROGEN isotopes, STABLE isotopes, SOLAR radiation, RANDOM forest algorithms, FORENSIC sciences
Abstract

Spatial patterns of stable isotopes in animal tissues or "isoscapes" can be used to investigate animal origins in a range of ecological and forensic investigations. Here, we developed a feather hydrogen isotope (δ2Hf) isoscape for Brazil based on 192 samples of feathers from the family Thraupidae from scientific collections. Raw values of δ2Hf ranged from -107.3 to +5.0‰, with higher values at the Caatinga biome (northeast Brazil) and lower values at the Amazon and Pantanal. A Random Forest (RF) method was used to model the spatial surface, using a range of environmental data as auxiliary variables. The RF model indicated a negative relationship between δ2Hf and Mean Annual Precipitation, Precipitation in the Warmest Quarter, and Annual Temperature Range and positive relationships for amount-weighted February-April precipitation δ2H (δ2Hp(Feb-April)) and Mean Annual Solar Radiation. Modelled δ2Hf values ranged from -85.7 to -13.6‰. Ours is the first δ2Hf isoscape for Brazil that can greatly assist our understanding of both ecological and biogeochemical processes controlling spatial variation in δ2H for this region. This isoscape can be used with caution, due to its poor predictive power (as found in other tropical regions) and can benefit from new sample input, new GNIP data, ecological and physiological studies, and keratin standard material better encompassing the range in feather samples from Brazil. So, we encourage new attempts to build more precise feather H isoscapes, as well as isoscapes based on other elements. [ABSTRACT FROM AUTHOR]

Published
2022
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11. Carbon and Beyond: The Biogeochemistry of Climate in a Rapidly Changing Amazon

Author

Covey, Kristofer, primary, Soper, Fiona, additional, Pangala, Sunitha, additional, Bernardino, Angelo, additional, Pagliaro, Zoe, additional, Basso, Luana, additional, Cassol, Henrique, additional, Fearnside, Philip, additional, Navarrete, Diego, additional, Novoa, Sidney, additional, Sawakuchi, Henrique, additional, Lovejoy, Thomas, additional, Marengo, Jose, additional, Peres, Carlos A., additional, Baillie, Jonathan, additional, Bernasconi, Paula, additional, Camargo, Jose, additional, Freitas, Carolina, additional, Hoffman, Bruce, additional, Nardoto, Gabriela B., additional, Nobre, Ismael, additional, Mayorga, Juan, additional, Mesquita, Rita, additional, Pavan, Silvia, additional, Pinto, Flavia, additional, Rocha, Flavia, additional, de Assis Mello, Ricardo, additional, Thuault, Alice, additional, Bahl, Alexis Anne, additional, and Elmore, Aurora, additional

Published
2021
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12. Recuperation of nitrogen cycling in Amazonian forests following agricultural abandonment

Author

Davidson, Eric A., de Carvalho, Claudio J. Reis, Figueira, Adelaine Michela, Ishida, Francoise Yoko, Ometto, Jean Pierre H. B., Nardoto, Gabriela B., Saba, Renata Tuma, Hayashi, Sanae N., Leal, Eliane C., Vieira, Ima Celia G., and Martinelli, Luiz A.

Subjects
Nitrogen cycle -- Research, Forest ecology -- Research, Nitrification -- Research, Phosphorus in the body -- Research, Environmental issues, Science and technology, Zoology and wildlife conservation, Research
Abstract

Author(s): Eric A. Davidson (corresponding author) [1]; Cláudio J. Reis de Carvalho [2]; Adelaine Michela Figueira [3]; Françoise Yoko Ishida [3]; Jean Pierre H. B. Ometto [3]; Gabriela B. Nardoto [...]

Published
2007
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14. Carbon and Nitrogen Isotope Ratios of Food and Beverage in Brazil

Author

Martinelli, Luiz A., primary, Nardoto, Gabriela B., additional, Perez, Maria A. Z., additional, Junior, Geraldo Arruda, additional, Fracassi, Fabiana C., additional, Oliveira, Juliana G. G., additional, Ottani, Isadora S., additional, Lima, Sarah H., additional, Mazzi, Edmar A., additional, Gomes, Taciana F., additional, Soltangheisi, Amin, additional, Filho, Adibe L. Abdalla, additional, Mariano, Eduardo, additional, Costa, Fabio J. V., additional, Duarte-Neto, Paulo J., additional, Moreira, Marcelo Z., additional, and Camargo, Plinio B., additional

Published
2020
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17. Consequences of removal of exotic species (eucalyptus) on carbon and nitrogen cycles in the soil-plant system in a secondary tropical Atlantic forest in Brazil with a dual-isotope approach.

Author

Carvalho Teixeira, Milena, Pierre Vitória, Angela, de Rezende, Carlos Eduardo, de Almeida, Marcelo Gomes, and Nardoto, Gabriela B.

Subjects
EUCALYPTUS, NITROGEN cycle, TROPICAL forests, INTRODUCED species, CARBON cycle, HUMUS, FOREST soils, SOIL dynamics
Abstract

The impact of exotic species on heterogeneous native tropical forest requires the understanding on which temporal and spatial scales these processes take place. Functional tracers such as carbon (δ13C) and nitrogen (δ15N) isotopic composition in the soil-plant system might help track the alterations induced by the exotic species. Thus, we assess the effects from the removal of the exotic species eucalyptus (Corymbia cytriodora) in an Atlantic forest Reserve, and eucalyptus removal on the alteration of the nutrient dynamics (carbon and nitrogen). The hypotheses were: (1) the eucalyptus permanence time altered δ13C and δ15N in leaves, soils and litter fractions (leaves, wood, flowers + fruits, and rest); and (2) eucalyptus removal furthered decomposition process of the soil organic matter. Hence, we determined the soil granulometry, the δ13C and δ15N in leaves, in the superficial soil layer, and litter in three sites: a secondary forest in the Atlantic forest, and other two sites where eucalyptus had been removed in different times: 12 and 3 months ago (M12 and M3, respectively). Litter samples presented intermediate δ13C and δ15N values in comparison with leaves and soil. In the M3, the greater δ13C values in both litter rest fraction and soil indicate the presence, cycling and soil incorporation of C, coming from the C4 photosynthesis of grassy species (Poaceae). In the secondary forest, the soil δ15N values were twice higher, compared with the eucalyptus removal sites, revealing the negative influence from these exotic species upon the ecosystem N dynamics. In the M12, the leaves presented higher δ13C mean value and lower δ15N values, compared with those from the other sites. The difference of δ13C values in the litter fractions regarding the soil led to a greater fractioning of 13C in all sites, except the flower + fruit fractions in the secondary forest, and the rest fraction in the M3 site. We conclude that the permanence of this exotic species and the eucalyptus removal have altered the C and N isotopic and elemental compositions in the soil-plant system. Our results suggest there was organic matter decomposition in all litter fractions and in all sites. However, a greater organic matter decomposition process was observed in the M3 soil, possibly because of a more intense recent input of vegetal material, as well as the presence of grassy, easily-decomposing herbaceous species, only in this site. Therefore, the dual-isotope approach generated a more integrated picture of the impact on the ecosystem after removing eucalyptus in this secondary Atlantic forest, and could be regarded as an option for future eucalyptus removal studies. [ABSTRACT FROM AUTHOR]

Published
2020
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19. Convergence of soil nitrogen isotopes across global climate gradients

Author

Craine, Joseph M., Elmore, Andrew J., Wang, Lixin, Augusto, Laurent, Baisden, W. Troy, Brookshire, E. N. J., Cramer, Michael D., Hasselquist, Niles J., Hobbie, Erik A., Kahmen, Ansgar, Koba, Keisuke, Kranabetter, J. Marty, Mack, Michelle C., Marin-Spiotta, Erika, Mayor, Jordan R., McLauchlan, Kendra K., Michelsen, Anders, Nardoto, Gabriela B., Oliveira, Rafael S., Perakis, Steven S., Peri, Pablo L., Quesada, Carlos A., Richter, Andreas, Schipper, Louis A., Stevenson, Bryan A., Tumer, Benjamin L., Viani, Ricardo A. G., Wanek, Wolfgang, Zeller, Bernd, Craine, Joseph M., Elmore, Andrew J., Wang, Lixin, Augusto, Laurent, Baisden, W. Troy, Brookshire, E. N. J., Cramer, Michael D., Hasselquist, Niles J., Hobbie, Erik A., Kahmen, Ansgar, Koba, Keisuke, Kranabetter, J. Marty, Mack, Michelle C., Marin-Spiotta, Erika, Mayor, Jordan R., McLauchlan, Kendra K., Michelsen, Anders, Nardoto, Gabriela B., Oliveira, Rafael S., Perakis, Steven S., Peri, Pablo L., Quesada, Carlos A., Richter, Andreas, Schipper, Louis A., Stevenson, Bryan A., Tumer, Benjamin L., Viani, Ricardo A. G., Wanek, Wolfgang, and Zeller, Bernd

Published
2015

20. Convergence of soil nitrogen isotopes across global climate gradients

Author

Craine, Joseph M., primary, Elmore, Andrew J., additional, Wang, Lixin, additional, Augusto, Laurent, additional, Baisden, W. Troy, additional, Brookshire, E. N. J., additional, Cramer, Michael D., additional, Hasselquist, Niles J., additional, Hobbie, Erik A., additional, Kahmen, Ansgar, additional, Koba, Keisuke, additional, Kranabetter, J. Marty, additional, Mack, Michelle C., additional, Marin-Spiotta, Erika, additional, Mayor, Jordan R., additional, McLauchlan, Kendra K., additional, Michelsen, Anders, additional, Nardoto, Gabriela B., additional, Oliveira, Rafael S., additional, Perakis, Steven S., additional, Peri, Pablo L., additional, Quesada, Carlos A., additional, Richter, Andreas, additional, Schipper, Louis A., additional, Stevenson, Bryan A., additional, Turner, Benjamin L., additional, Viani, Ricardo A. G., additional, Wanek, Wolfgang, additional, and Zeller, Bernd, additional

Published
2015
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22. Nitrogen flows and fate in urban landscapes

Author

Sutton, Mark A., Howard, Clare M., Erisman, Jan Willem, Billen, Gilles, Bleeker, Albert, Grennfelt, Peringe, van Grinsven, Hans, Grizzetti, Bruna, Svirejeva-Hopkins, Anastasia, Reis, Stefan, Magid, Jakob, Nardoto, Gabriela B., Barles, Sabine, Bouwman, Alexander F., Erzi, Ipek, Kousoulidou, Marina, Sutton, Mark A., Howard, Clare M., Erisman, Jan Willem, Billen, Gilles, Bleeker, Albert, Grennfelt, Peringe, van Grinsven, Hans, Grizzetti, Bruna, Svirejeva-Hopkins, Anastasia, Reis, Stefan, Magid, Jakob, Nardoto, Gabriela B., Barles, Sabine, Bouwman, Alexander F., Erzi, Ipek, and Kousoulidou, Marina

Published
2011

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