Long-term warming offsets the beneficial effect of elevated CO2 on mineral associated organic carbon in Mollisols

被引：0

作者：

SiMa, Xinqi ^{[1
,2
]}

Li, Yansheng ^{[1
]}

Yu, Zhenhua ^{[1
]}

Gu, Haidong ^{[1
]}

Liu, Junjie ^{[1
]}

Liu, Judong ^{[1
]}

Fang, Rui ^{[1
]}

Hu, Xiaojing ^{[1
]}

Liu, Xiaobing ^{[1
]}

Wang, Guanghua ^{[1
]}

Tang, Caixian ^{[3
]}

Franks, Ashley ^{[4
]}

Wu, Junjiang ^{[5
]}

Miao, Shujie ^{[6
]}

Qiao, Yunfa ^{[6
]}

Jin, Jian ^{[1
,3
,5
]}

机构：

[1] State Key Laboratory of Black Soils Conservation and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin

[2] University of Chinese Academy of Sciences, Beijing

[3] La Trobe Institute for Sustainable Agriculture and Food, Department of Ecology, Plant and Animal Sciences, La Trobe University, Melbourne Campus, Bundoora, 3086, VIC

[4] Department of Physiology, Anatomy and Microbiology, La Trobe University, Melbourne Campus, Bundoora, 3086, VIC

[5] Key Laboratory of Soybean Cultivation of Ministry of Agriculture, Soybean Research Institute, Heilongjiang Academy of Agricultural Sciences, Harbin

[6] School of Applied Meteorology, Nanjing University of Information Sciences & Technology, Nanjing

来源：

Science of the Total Environment | 2025年 / 966卷

基金：

澳大利亚研究理事会;

关键词：

Climate change; Metagenomics; Microbial metabolisms; SOC fractions;

D O I：

10.1016/j.scitotenv.2025.178698

中图分类号：

学科分类号：

摘要：

The stability of soil organic carbon (SOC) is fundamentally important to the carbon-climate feedback because soils act as a major carbon source or sink under climate change. The uncertainty of SOC stability in farming soils in response to climate change necessitates mechanistic studies on microbial attributes to the change of SOC. Here, we used open-top chambers to simulate elevated CO2 (eCO2) and warming for 12 years in a soybean-grown Mollisol. We did not find the change of SOC stock under eCO2 or warming. Although eCO2 resulted in the accumulation of mineral-associated organic carbon, this effect diminished under warming. The amplicon sequencing of 16S gene indicated a significant change in microbial community composition under warming or eCO2. The metagenomic sequencing demonstrated that warming increased the abundances of microbial genes related to decomposition of labile carbon such as hemicellulose and pectin. The warming-induced stimulation of microbial catabolic metabolisms on organic carbon decomposition might have accelerated SOC turnover, which may offset the increased mineral-associated organic carbon of the Mollisol under eCO2. Long-term eCO2 and warming might not significantly alter the SOC stock or stability but accelerate carbon cycling in farming Mollisols. © 2025 Elsevier B.V.

引用

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