Temperature effect on erosion-induced disturbances to soil organic carbon cycling

Zhengang Wang (), Yizhe Zhang, Gerard Govers, Guoping Tang, Timothy A. Quine, Jianxiu Qiu, Ana Navas, Haiyan Fang, Qian Tan and Kristof Van Oost
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Zhengang Wang: Guangdong University of Technology
Yizhe Zhang: Sun Yat-sen University
Gerard Govers: KU Leuven
Guoping Tang: Sun Yat-sen University
Timothy A. Quine: University of Exeter
Jianxiu Qiu: Sun Yat-sen University
Ana Navas: Estación Experimental de Aula Dei (EEAD-CSIC)
Haiyan Fang: Chinese Academy of Sciences
Qian Tan: Guangdong University of Technology
Kristof Van Oost: Université Catholique de Louvain

Nature Climate Change, 2023, vol. 13, issue 2, 174-181

Abstract: Abstract Erosion exerts control on soil organic carbon (SOC) and both erosion and SOC are affected by climate. To what extent temperature controls the coupling between these erosion–C interactions remains unclear. Using 137Cs and SOC inventories from catchments spanning different climates, we find that increasing decomposition rates with temperature result in the efficient replacement of SOC laterally lost by erosion in eroding areas but lower preservation of deposited SOC in depositional areas. When combined at the landscape level, the erosion-induced C sink strength per unit lateral SOC flux increases with temperature from 0.19 g C (g C)−1 at 0 °C to 0.24 g C (g C)−1 at 25 °C. We estimated that the global C sink of 0.050 Pg C yr−1 induced by water erosion on croplands increases by 7% because of climate change. Our results reveal a negative feedback loop between climate change and erosion-induced disturbance to SOC cycling.

Date: 2023
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DOI: 10.1038/s41558-022-01562-8

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