Alteration in enzymatic stoichiometry controls the response of soil organic carbon dynamic to nitrogen and water addition in temperate cultivated grassland

文献类型： 外文期刊

第一作者： Xu, Meng

作者： Xu, Meng;Fang, Huajun;Yang, Yan;Lu, Mingzhu;Xu, Meng;Fang, Huajun;Xu, Lijun;Fang, Huajun;Cheng, Shulan;Yu, Guangxia;Fang, Huajun

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关键词： Global change factors; Soil microbial communities; Enzyme activity; Soil organic carbon fraction; Cultivated grassland

期刊名称：EUROPEAN JOURNAL OF SOIL BIOLOGY （ 影响因子：2.846； 五年影响因子：3.618 ）

ISSN： 1164-5563

年卷期： 2020 年 101 卷

页码：

收录情况： SCI

摘要： Cultivated grassland can serve as one solution to the degradation of natural grassland. However, less is understood of the response of the microbial communities in cultivated grassland soils to global change factors such as nitrogen (N) deposition and precipitation change, and their linkages with the dynamics of soil organic carbon (SOC). In this study, field experimental plots that simulate different N deposition and precipitation levels were established to investigate the responses of soil microbial communities and their linkages with particulate-sized SOC fractions. Results showed that the activities of hydrolytic enzymes responded significantly to N addition, watering and their combinations, whereas the abundance and composition of microbial communities showed no significant difference among treatments. Addition of N and water generally promoted the activities of N degrading enzymes such as beta-N-acetylglucosaminidase (NAG) and leucine aminopeptidase (LAP), and thus decreased the Cto N-degrading activity (enzyme C/N ratio). This decrease in enzyme C/N ratio was significantly correlated with the accumulation of microbial-accessible particulate organic carbon (POC), indicating that three years of N application did not alleviate microbial N limitation so that microbial communities had invested more in acquisition of N instead of C. In contrast, the content of microbial-inaccessible mineral associated organic carbon (MAOC) was decreased probably as a result of N limitation on the suppressed microbial growth. Collectively, these results highlight that stoichiometric deviation between substrate and microbial demand can be one critical driver for SOC dynamics in cultivated grassland under global change scenarios.

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