Aridity drives the response of soil total and particulate organic carbon to drought in temperate grasslands and shrublands

IF 11.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Advances Pub Date : 2024-10-04 DOI:10.1126/sciadv.adq2654

Baoku Shi, Manuel Delgado-Baquerizo, Alan K. Knapp, Melinda D. Smith, Sasha Reed, Brooke Osborne, Yolima Carrillo, Fernando T. Maestre, Yu Zhu, Anping Chen, Kate Wilkins, Martin C. Holdrege, Andrew Kulmatiski, Catherine Picon-Cochard, Christiane Roscher, Sally Power, Kerry M. Byrne, Amber C. Churchill, Anke Jentsch, Hugh A. L. Henry, Karen H. Beard, Max A. Schuchardt, Nico Eisenhauer, Rafael Otfinowski, Yann Hautier, Huitao Shen, Yonghui Wang, Zhongwu Wang, Chengliang Wang, Daniela Francis Cusack, Alessandro Petraglia, Michele Carbognani, T’ai G.W. Forte, S.Luke Flory, Pengli Hou, Tao Zhang, Weifeng Gao, Wei Sun

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Abstract

The increasing prevalence of drought events in grasslands and shrublands worldwide potentially has impacts on soil organic carbon (SOC). We leveraged the International Drought Experiment to study how SOC, including particulate organic carbon (POC) and mineral-associated organic carbon (MAOC) concentrations, responds to extreme drought treatments (1-in-100-year) for 1 to 5 years at 19 sites worldwide. In more mesic areas (aridity index > 0.65), SOC and POC concentrations decreased by 7.9% (±3.9) and 15.9% (±6.2) with drought, respectively, but there were no impacts on MAOC concentrations. However, drought had no impact on SOC, POC, or MAOC concentrations in drylands (aridity index < 0.65). The response of SOC to drought varied along an aridity gradient, concomitant with interannual precipitation variability and standing SOC concentration gradients. These findings highlight the differing response magnitudes of POC and MAOC concentrations to drought and the key regulating role of aridity.

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干旱驱动温带草地和灌木丛中土壤总有机碳和颗粒有机碳对干旱的响应

全球草地和灌木林干旱事件的日益频繁可能会对土壤有机碳（SOC）产生影响。我们利用国际干旱试验研究了全球 19 个地点的土壤有机碳（包括颗粒有机碳和矿质相关有机碳）浓度如何对 1 至 5 年的极端干旱处理（百年一遇）做出反应。在较为湿润的地区（干旱指数为 0.65），SOC 和 POC 浓度在干旱中分别降低了 7.9% (±3.9) 和 15.9% (±6.2)，但 MAOC 浓度没有受到影响。然而，干旱对旱地的 SOC、POC 或 MAOC 浓度没有影响（干旱指数为 0.65）。SOC 对干旱的响应沿干旱度梯度变化，与年际降水量变化和 SOC 浓度梯度一致。这些发现凸显了 POC 和 MAOC 浓度对干旱的不同响应程度以及干旱的关键调节作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science Advances 综合性期刊-综合性期刊

CiteScore

21.40

自引率

1.50%

发文量

1937

审稿时长

29 weeks

期刊介绍： Science Advances, an open-access journal by AAAS, publishes impactful research in diverse scientific areas. It aims for fair, fast, and expert peer review, providing freely accessible research to readers. Led by distinguished scientists, the journal supports AAAS's mission by extending Science magazine's capacity to identify and promote significant advances. Evolving digital publishing technologies play a crucial role in advancing AAAS's global mission for science communication and benefitting humankind.