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Soil organic carbon decomposition responding to warming under nitrogen addition across Chinese vegetable soils

文献类型： 外文期刊

作者： Xu, Xintong 1 ; Zhang, Qianqian 1 ; Song, Mengxin 1 ; Zhang, Xi 1 ; Bi, Ruiyu 1 ; Zhan, Liping 1 ; Dong, Yubing 1 ; Xiong, Zhengqin 1 ;

作者机构： 1.Nanjing Agr Univ, Coll Resources & Environm Sci, Jiangsu Key Lab Low Carbon Agr & GHGs Mitigat, Nanjing 210095, Peoples R China

2.Zhejiang A&F Univ, State Key Lab Subtrop Silviculture, Hangzhou 311300, Peoples R China

3.Jiangsu Acad Agr Sci, Huaiyin Inst Agr Sci Xuhuai Reg Jiangsu, Huaian 223001, Peoples R China

关键词： Temperature sensitivity; SOC decomposition; Vegetable soils; Microbial parameters; Resource stoichiometry

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：7.129； 五年影响因子：7.284 ）

ISSN： 0147-6513

年卷期： 2022 年 242 卷

页码：

收录情况： SCI

摘要： Chemical fertilization in excess and warming disrupt the soil microbes and alter resource stoichiometry, particularly in intensive vegetable soils, while the effects of these variables on the temperature sensitivity of soil organic carbon (SOC) decomposition (Q10) and SOC stability remain elusive. Thus, we collected six long-term vegetable soils along a climatic gradient to examine the microbial mechanisms and resource stoichiometry ef-fects on fluctuations in Q10 and SOC stability induced by warming and fertilization from vegetable soils. Our results showed that the SOC decomposition was dominated by microbes and regulated by stoichiometry. Compared to cold sites, higher Q10 of SOC decomposition was observed in warm sites, accompanied by lower enzyme activities, microbial CUE, and C:N ratio. In this context, warming reduced SOC stability as evidenced by up to 31.8% greater Q10 (1.45) at warm sites than at cold sites (1.10) owing to less richness of microbial communities and lower microbial CUE. The relatively lower pH and labile organic C value restricted the development of microbial richness, and decreased C-and N-related enzyme activities and a lower C:N ratio resulted in microbial CUE reduction. Additionally, N fertilization altered the C:N imbalance and enhanced SOC stability in vegetable soils, exhibiting an increase of Q10 values, particularly of great importance in warm sites. Collectively, our findings emphasize the importance of the microbial mechanism and resource stoichiometry in predicting variations in Q10 and fluctuations in SOC stability, and provide theoretical advice on improving management policies in the context of warming and fertilization from vegetable soils.

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