
1. 三峡库区地质灾害教育部重点实验室(三峡大学)
2. 三峡大学土木与建筑学院
3. 三峡库区生态环境教育部工程研究中心(三峡大学)
Published:2025
移动端阅览
[J]. 2025, (4): 16-22.
为探索三峡水库消落带出露期土壤分离能力的年内时空变化特征,本文在三峡水库消落带2019年出露期内的不同时间采集不同出露高程土壤样品,测定土壤理化性质、植物生物量信息及土壤分离能力(D
c
)
利用Pearson相关分析、主成分回归分析(PCR)、SEM结构方程模型以及PLS-PM偏最小二乘路径分析,明确土壤理化性质和植物生物量对土壤分离能力的影响及其影响路径.结果表明:D
c
随时间的增加总体呈现下降趋势,随高程的增大呈现出先降后升的趋势,在高程为165~170 m时达到最小;D
c
与水稳性团聚体平均质量直径(MWD)、有机质含量、地上生物量和地下生物量呈现显著的负相关关系,与黏粒含量呈现显著正相关关系,PCR分析表明对D
c
负向贡献度依次为MWD>有机质含量>地上生物量>地下生物量;地上生物量和地下生物量作为外生变量,通过调节次级因子(黏粒含量和有机质含量)
对关键因子MWD施加间接影响,进一步作用于D
c
MWD在路径中起到核心的中介作用,是D
c
的核心影响因子.本文可为三峡水库消落带的水土保持和生态修复提供理论依据,对三峡水库的防灾减灾具有一定的指导意义.
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