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Stimulation of primed carbon under climate change corresponds with phosphorus mineralization in the rhizosphere of soybean

文献类型： 外文期刊

作者： Guo, Lili 1 ; Yu, Zhenhua 1 ; Li, Yansheng 1 ; Xie, Zhihuang 1 ; Wang, Guanghua 1 ; Liu, Junjie 1 ; Hu, Xiaojing 1 ; Wu, Junjiang 3 ; Liu, Xiaobing 1 ; Jin, Jian 1 ;

作者机构： 1.Chinese Acad Sci, Northeast Inst Geog & Agroecol, Key Lab Mollisols Agroecol, Harbin 150081, Peoples R China

2.Henan Acad Sci, Inst Geog, 64 Longhai Rd, Zhengzhou 450052, Peoples R China

3.Heilongjiang Acad Agr Sci, Minist Agr, Soybean Res Inst, Key Lab Soybean Cultivat, Harbin, Peoples R China

4.La Trobe Univ, Ctr AgriBiosci, Dept Anim Plant & Soil Sci, Melbourne Campus, Bundoora, Vic 3086, Australia

5.Chinese Acad Sci, Northeast Inst Geog & Agroecol, Harbin 150081, Peoples R China

关键词： Climate change; 13CO2 labeling; Priming effect; P fraction; C degradation; P functional genes

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：9.8； 五年影响因子：9.6 ）

ISSN： 0048-9697

年卷期： 2023 年 899 卷

页码：

收录情况： SCI

摘要： Elevated CO2 and temperature likely alter photosynthetic carbon inputs to soils, which may stimulate soil mi-crobial activity to accelerate the decomposition of soil organic carbon (SOC), liberating more phosphorus (P) into the soil solution. However, this hypothesis on the association of SOC decomposition and P transformation in the plant rhizosphere requires robust soil biochemical evidence, which is critical to nutrient management for the mitigation of soil quality against climate change. This study investigated the microbial functional genes relevant to P mineralization together with priming processes of SOC in the rhizosphere of soybean grown under climate change. Soybean plants were grown under elevated CO2 (eCO2, 700 ppm) combined with warming (+ 2 degrees C above ambient temperature) in open-top chambers. Photosynthetic carbon flow in the plant-soil continuum was traced with 13CO2 labeling. The eCO2 plus warming treatment increased the primed carbon (C) by 43 % but decreased the NaHCO3-extratable organic P by 33 %. Furthermore, NaHCO3-Po was negatively correlated with phosphatase activity and microbial biomass C. Elevated CO2 increased the abundances of C degradation genes, such as abfA and ManB, and P mineralization genes, such as gcd, phoC and phnK. The results suggested that increased photosynthetic carbon inputs to the rhizosphere of plants under eCO2 plus warming stimulated the microbial population and metabolic functions of both SOC and organic P mineralization. There is a positive relationship between the rhizosphere priming effect and P mineralization. The response of microorganisms to plant-C flow is decisive for coupled C and P cycles, which are likely accelerated under climate change.

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