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Biotic and Abiotic Drivers of Topsoil Organic Carbon Concentration in Drylands Have Similar Effects at Regional and Global Scales

Abstract
Drylands contain 25% of the world’s soil organic carbon (SOC), which is controlled by many factors, both abiotic and biotic. Thus, understanding how these factors control SOC concentration can help to design more sustainable land-use practices in drylands aiming to foster and preserve SOC storage, something particularly important to fight ongoing global warming. We use two independent, largescale databases with contrasting geographic coverage (236 sites [ver mas...]
Drylands contain 25% of the world’s soil organic carbon (SOC), which is controlled by many factors, both abiotic and biotic. Thus, understanding how these factors control SOC concentration can help to design more sustainable land-use practices in drylands aiming to foster and preserve SOC storage, something particularly important to fight ongoing global warming. We use two independent, largescale databases with contrasting geographic coverage (236 sites in global drylands and 185 sites in Patagonia, Argentina) to evaluate the relative importance of abiotic (precipitation, temperature and soil texture) and biotic (primary productivity) factors as drivers of SOC concentration in drylands at global and regional scales. We found that biotic and abiotic factors had similar effects on SOC concentration across regional and global scales: Maximum temperature and sand content had negative effects, while precipitation and plant productivity exerted positive effects. Our findings provide empirical evidence that increases in temperature and reductions in rainfall, as forecasted by climatic models in many drylands worldwide, promote declines in SOC both directly and indirectly via the reduction in plant productivity. This has important implications for the conservation of drylands under climate change; land management should seek to enhance plant productivity as a tool to offset the negative impact of climate change on SOC storage and on associated ecosystem services. [Cerrar]
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Author
Gaitan, Juan Jose;   Maestre, Fernando Tomás;   Bran, Donaldo Eduardo;   Buono, Gustavo Gabriel;   Dougill, Andrew J.;   Garcia Martinez, Guillermo Carlos;   Ferrante, Daniela;   Guuroh, Reginald Tang;   Linstadter, Anja;   Massara Paletto, Virginia;   Thomas, Andrew David;   Oliva, Gabriel Esteban;  
Fuente
Ecosystems 22 (7) : 1445-1456 (Noviembre 2019)
Date
2019-11
Editorial
Springer
ISSN
1432-9840
1435-0629
URI
http://hdl.handle.net/20.500.12123/6523
https://link.springer.com/article/10.1007/s10021-019-00348-y
DOI
https://doi.org/10.1007/s10021-019-00348-y
Formato
pdf
Tipo de documento
artículo
Palabras Claves
Suelo; Soil; Desertificación; Desertification; Cambio Climático; Climate Change; Suelo Semiárido; Semiarid Soils; Carbono Orgánico del Suelo; Soil Organic Carbon; Región Patagónica; Estepa; SOC;
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Excepto donde se diga explicitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
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