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194 results on '"Xu, Guoce"'

1. Effects of Grazing Intensity on Soil Microbial Community Characteristics in Desert Steppe

Author

ZHANG Mengmeng, XU Guoce, ZHANG Tiegang, FANG Kang, TUO Mengyao, WAN Shun, and WANG Bin

Subjects
desert steppe, grazing intensity, soil microorganisms, soil physicochemical properties, Environmental sciences, GE1-350, Agriculture
Abstract

[Objective] Investigating the response mechanism of soil microbial communities to changes in grazing intensity can provide scientific theoretical and technical support for ecological protection and restoration of desert steppe. [Methods] Taking the desert steppe in Inner Mongolia as the research object, we studied the effects of different grazing intensities (no grazing, light grazing, medium grazing, and high grazing) on soil physicochemical properties and the composition and diversity of soil microbial communities at different soil depths (0—20 cm and 20—40 cm), the interactions between soil physicochemical properties and soil microbial communities were analyzed. [Results] Compared to no grazing, medium grazing significantly (p0.05) under different grazing intensities. In addition, grazing decreased the abundance and diversity of bacterial communities at 20—40 cm depth, while increased the abundance and diversity of bacteria communities at 20—40 cm depth. Under light and moderate grazing conditions, the abundance and diversity of soil fungal communities at 0—20 cm depth increased, with no significant effect (p>0.05) on the abundance and diversity of soil fungal communities at 20—40 cm depth. [Conclusion] Mantel tests showed that total nitrogen of desert steppe soil was the primary factor influencing the change of desert steppe soil bacterial abundance with grazing intensity. The research results contribute to understanding the ecological sensitivity of soil microbes and offer scientific guidance for achieving sustainable management in desert steppe ecosystems.

Published
2024
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13. Spatiotemporal Variation Characteristics of Extreme Precipitation in the Mid–Lower Reaches of the Yangtze River Basin Based on Precipitation Events.

Author

Zhang, Yixin, Li, Peng, Xu, Guoce, Li, Zhanbin, Wang, Zhou, Rao, Yueming, Liu, Zifan, Chen, Yiting, and Wang, Bin

Abstract

In addition to greater precipitation on extreme days of precipitation, preceding and succeeding precipitation (PSP) is often an objective component of flooding in the mid–lower reaches of the Yangtze River Basin (MLRYRB). In this study, focused on the temporal distribution pattern of precipitation, the concept of an extreme precipitation event (EPE), defined as a consecutive precipitation event having at least one daily precipitation extreme, is proposed to consider PSP in an extreme event. We analyzed the spatiotemporal variation of four types of EPEs based on daily data obtained from 130 monitoring stations covering 1960–2019. Extreme precipitation increased significantly over the last 60 years (p < 0.01). The frequency and precipitation amount of single-day EPEs accounted for only 13% and 21%, respectively, while multi-day continuous EPE types that are associated with PSP accounted for 87% and 79%, respectively, confirming the connotations of EPEs. The front and late EPEs under the 100-year return level reached 250 mm and 230 mm, respectively. Furthermore, climate warming could lead to significant increases in the frequency of single-day and late EPEs, particularly in the southern region. The EPE concept may be helpful in exploring disaster-causing processes under extreme weather, and it provides a theoretical basis for deriving the precipitation hazard chain, which is more applicable to basins with long precipitation durations. [ABSTRACT FROM AUTHOR]

Published
2024
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