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Effects of Drying and Rewetting Cycles on Carbon Dioxide Emissions and Soil Microbial Communities

文献类型： 外文期刊

作者： Zhang, Yun 1 ; Li, Xiaohan 1 ; Liu, Xinmei 1 ; Cui, Yufei 1 ; Zhang, Ye 1 ; Zheng, Xiaoying 1 ; Zhang, Weiwei 1 ; Fan, Yue 1 ; Zou, Junliang 1 ;

作者机构： 1.Beijing Acad Agr & Forestry Sci, Inst Grassland Flowers & Ecol, Beijing 100097, Peoples R China

关键词： drying and rewetting; soil microorganisms; CO2 fluxes; cumulative CO2 emissions; woodland soils

期刊名称：FORESTS （ 影响因子：3.282； 五年影响因子：3.292 ）

ISSN：

年卷期： 2022 年 13 卷 11 期

页码：

收录情况： SCI

摘要： Extreme rainfall and drought events attributed to climate change are anticipated to occur in the current century, resulting in frequent drying and rewetting cycles (DWCs) in soils, which will, in turn, influence soil properties and microorganisms. Sample plots of Sophora japonica, Pinus tabulaeformis, and Ginkgo biloba were selected, and undisturbed soil columns were collected. CK was the constant drying treatment; the precipitation intensities of R80, R40, and R20 were 80 mm, 40 mm, and 20 mm, respectively, and the total precipitation for the four treatments was 160 mm. Significant differences were observed in the cumulative CO2 emissions among the various DWC frequencies for the same woodland soils. A significant correlation was observed between the Birch effect and the DWC frequencies of the three woodland soils. A Pearson's correlation analysis revealed that background nutrient contents were the key factors influencing alpha diversity. In conclusion, DWCs generally increased CO2 fluxes, cumulative CO2 emissions, and the Birch effect in addition to decreasing the alpha diversity of soil microorganisms when compared to those in the constant drying treatment.

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