The effects of short-term grazing on plant and soil carbon and nitrogen isotope composition in a temperate grassland

文献类型： 外文期刊

第一作者： Zhou, Yongchun

作者： Zhou, Yongchun;Li, Haibo;Xu, Xinyang;Li, Yinghua;Zhang, Wenbo;Lin, Hong;Ding, Yong

作者机构：

关键词： Carbon content; Nitrogen content; Soil organic carbon decomposition; Nitrogen dynamics

期刊名称：JOURNAL OF ARID ENVIRONMENTS （ 影响因子：2.211； 五年影响因子：2.684 ）

ISSN： 0140-1963

年卷期： 2020 年 179 卷

页码：

收录情况： SCI

摘要： To clarify effects of short-term grazing on C and N contents and dynamics in temperate grasslands, we examined aboveground biomass, vegetation cover, plant and soil C, N, C:N ratio, delta C-13, delta N-15, Delta delta C-13 and Delta delta N-15 across five grazing intensities. Grazing had no effects on vegetation and soil C, but increased vegetation and soil N. As tion indicated by grazing increasing Delta delta C-13 and reducing soil delta N-15, grazing accelerated soil organic carbon (SOC) decomposition but decelerated the rate of N production. Contrasting effects of increased SOC decomposition and allocation of more belowground biomass are suggested to be responsible for SOC not changing. The effects of grazing on plant delta C-13 differed among species, but for most species grazing increased plant delta C-13. However, grazing reduced vegetation delta C-13, the opposite trends of species and community levels indicating that grazing would change plant species composition. Reduced Delta delta N-15 indicates that grazing would change the main N sources used by plants. The study emphasizes that measuring plant and soil delta C-13, delta N-15, Delta delta C-13 and Delta delta N-15 simultaneously is necessary to comprehensively understand how grazing influences C and N dynamics in plant-soil systems. We also raise the concern that grazing would eventually lead to loss of SOC with consequent decline in C sequestration.

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