文献类型：期刊文献

英文题名：Mechanisms of Soil Aggregate Stability Influencing Slope Erosion in North China

作者：Yang, Ying[1,2] Zhang, Shuai[1,2] Yuan, Weijie[1,2] Li, Zedong[3] Deng, Xiuxiu[1,2] Wang, Lina[1,2]

第一作者：Yang, Ying

通信作者：Yuan, WJ[1];Yuan, WJ[2];Li, ZD[3]

机构：[1]Chinese Acad Forestry, Expt Ctr Forestry North China, Beijing 102300, Peoples R China;[2]Natl Permanent Sci Res Base Warm Temperate Zone Fo, Beijing 102300, Peoples R China;[3]Chinese Acad Forestry, Inst Ecol Conservat & Restorat, Beijing 100091, Peoples R China

年份：2025

卷号：12

期号：10

外文期刊名：HYDROLOGY

收录：Scopus(收录号：2-s2.0-105020210257);WOS:【ESCI(收录号:WOS:001603709900001)】；

基金：This research was funded by [Fundamental Research Funds for the Central Non-profit Research Institution of CAF] grant number [CAFYBB2022MA009].

语种：英文

外文关键词：rainfall intensity; aggregate stability; slope erosion; microbial response; runoff dynamics; root-microbial cementation

摘要：Soil aggregate stability plays a central role in mediating slope erosion, a key ecological process in North China. This study aimed to investigate how aggregate structures (reflected by rainfall intensity and vegetation-type differences) influence the erosion process. Using wasteland as the control, we conducted artificial simulated rainfall experiments on soils covered by Quercus variabilis, Platycladus orientalis, and shrubs, with three rainfall intensity gradients. Key findings showed that Platycladus orientalis exhibited the strongest infiltration capacity and longest runoff initiation delay due to its high proportion of stable macroaggregates (>0.25 mm), while barren land readily formed surface crusts, leading to the fastest runoff. Increased rainfall intensity significantly exacerbated runoff and erosion. When the macroaggregate content exceeded 60%, sediment yield rates dropped sharply, with a significant negative exponential relationship between the mean weight diameter (MWD) and sediment yield; barren land (dominated by microaggregates) faced the highest erosion risk and fell into an erosion-fragmentation vicious cycle. Redundancy analysis revealed that microbial communities (e.g., Ascomycota) and fine roots were dominant erosion-controlling factors under heavy rainfall. Ultimately, the synergistic system of the macroaggregate architecture and root-microbial cementation enabled Platycladus orientalis and other tree stands to reduce soil erodibility via maintaining aggregate stability, whereas shrubs and barren land amplified rainfall intensity effects. barren landbarren landmmh(-1) mmh(-1) mmh(-1) barren land.