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Vulnerability of mineral-associated soil organic carbon to climate across global drylands

2024; Nature Portfolio; Volume: 14; Issue: 9 Linguagem: Inglês

10.1038/s41558-024-02087-y

1758-6798

Paloma Díaz‐Martínez, Fernando T. Maestre, Eduardo Moreno‐Jiménez, Manuel Delgado‐Baquerizo, David J. Eldridge, Hugo Saíz, Nicolas Gross, Yoann Le Bagousse‐Pinguet, Beatriz Gozalo, Victoria Ochoa, Emilio Guirado, Miguel García‐Gómez, Enrique Valencia, Sergio Asensio, Miguel Berdugo, Jaime Martínez‐Valderrama, Betty J. Mendoza, Juan Carlos García‐Gil, Claudio Zaccone, Marco Panettieri, Pablo García‐Palacios, Wei Fan, Iria Benavente‐Ferraces, Ana Rey, Nico Eisenhauer, Simone Cesarz, Mehdi Abedi, Rodrigo J. Ahumada, Julio M. Alcántara, Fateh Amghar, Valeria Aramayo, Antonio I. Arroyo, Khadijeh Bahalkeh, Farah Ben Salem, Niels Blaum, Bazartseren Boldgiv, Matthew A. Bowker, Donaldo Bran, Cristina Branquinho, Chongfeng Bu, Yonatan Cáceres Escudero, Rafaella Canessa, Andrea P. Castillo‐Monroy, Ignacio Castro, Patricio Castro-Quezada, Roukaya Chibani, Abel Augusto Conceição, Courtney M. Currier, Anthony Darrouzet‐Nardi, Balázs Déak, Chris R. Dickman, David A. Donoso, Andrew J. Dougill, Jorge Durán, Hamid Ejtehadi, Carlos I. Espinosa, Alex Fajardo, Mohammad Farzam, Daniela Ferrante, Lauchlan H. Fraser, Juan Gaitán, Elizabeth Gusmán Montalván, Rosa Mary Hernández, Andreas von Heßberg, Norbert Hölzel, Elisabeth Huber‐Sannwald, Frederic Mendes Hughes, Oswaldo Jadán, Katja Geißler, Anke Jentsch, Mengchen Ju, Kudzai Farai Kaseke, Liana Kindermann, Jessica E. Koopman, Peter C. le Roux, Pierre Liancourt, Anja Linstädter, Jushan Liu, Michelle A. Louw, Gillian Maggs‐Kölling, Thulani P. Makhalanyane, Oumarou Malam Issa, Eugène Marais, Pierre Margerie, Antonio J. Mazaneda, Mitchel P. McClaran, João Vitor S. Messeder, Juan Pablo Mora, Gerardo Moreno, Seth M. Munson, Alice Nunes, Gabriel Oliva, Gastón R. Oñatibia, Brooke Osborne, Guadalupe Peter, Yolanda Pueyo, R. Emiliano Quiroga, Sasha C. Reed, Victor M. Reyes, Alexandra Rodríguez, Jan C. Ruppert, Osvaldo E. Sala, Ayman Salah, Julius Sebei, Michael Sloan, Shijirbaatar Solongo, Ilan Stavi, Colton Stephens, Alberto L. Teixido, Andrew D. Thomas, Heather L. Throop, Katja Tielbörger, Samantha K. Travers, James Val, Orsolya Valkó, Liesbeth van den Brink, Frederike Velbert, Wanyoike Wamiti, Deli Wang, Lixin Wang, Glenda M. Wardle, Laura Yahdjian, Eli Zaady, Juan M. Zeberio, Yuanming Zhang, Xiaobing Zhou, César Plaza,

Soil and Water Nutrient Dynamics

Mineral-associated organic carbon (MAOC) constitutes a major fraction of global soil carbon and is assumed less sensitive to climate than particulate organic carbon (POC) due to protection by minerals. Despite its importance for long-term carbon storage, the response of MAOC to changing climates in drylands, which cover more than 40% of the global land area, remains unexplored. Here we assess topsoil organic carbon fractions across global drylands using a standardized field survey in 326 plots from 25 countries and 6 continents. We find that soil biogeochemistry explained the majority of variation in both MAOC and POC. Both carbon fractions decreased with increases in mean annual temperature and reductions in precipitation, with MAOC responding similarly to POC. Therefore, our results suggest that ongoing climate warming and aridification may result in unforeseen carbon losses across global drylands, and that the protective role of minerals may not dampen these effects. Protection afforded by inorganic minerals is assumed to make mineral-associated organic carbon less susceptible to loss under climate change than particulate organic carbon. However, a global study of soil organic carbon from drylands suggests that this is not the case.