Li Jinquan, Pei Junmin, Fang Changming, Li Bo, Nie Ming
Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, School of Life Sciences, Fudan University, Shanghai, 200438, China.
College of Life Sciences, Shanghai Normal University, Shanghai, 200234, China.
Nat Commun. 2024 Jan 19;15(1):617. doi: 10.1038/s41467-024-44895-y.
Low moisture conditions result in substantially more soil inorganic carbon (SIC) than soil organic carbon (SOC) in drylands. However, whether and how changes in moisture affect the temperature response of SIC in drylands are poorly understood. Here, we report that the temperature sensitivity of SIC dissolution increases but that of SOC decomposition decreases with increasing natural aridity from 30 dryland sites along a 4,500 km aridity gradient in northern China. To directly test the effects of moisture changes alone, a soil moisture control experiment also revealed opposite moisture effects on the temperature sensitivities of SIC and SOC. Moreover, we found that the temperature sensitivity of SIC was primarily regulated by pH and base cations, whereas that of SOC was mainly regulated by physicochemical protection along the aridity gradient. Given the overall increases in aridity in a warming world, our findings highlight that drought may exacerbate dryland soil carbon loss from SIC under warming.
在旱地，低湿度条件导致土壤无机碳（SIC）比土壤有机碳（SOC）多得多。然而，湿度变化是否以及如何影响旱地SIC的温度响应，目前还知之甚少。在这里，我们报告说，在中国北方沿4500公里干旱梯度的30个旱地站点，随着自然干旱程度的增加，SIC溶解的温度敏感性增加，而SOC分解的温度敏感性降低。为了直接测试仅水分变化的影响，一项土壤湿度控制实验也揭示了水分对SIC和SOC温度敏感性的相反影响。此外，我们发现，SIC的温度敏感性主要受pH值和碱性阳离子调节，而SOC的温度敏感性主要受沿干旱梯度的物理化学保护调节。鉴于在全球变暖的情况下干旱总体增加，我们的研究结果突出表明，干旱可能会加剧变暖条件下旱地土壤因SIC导致的碳损失。
Zotero 插件
