水土保持研究2025，Vol.32Issue(3)：81-90,10.DOI:10.13869/j.cnki.rswc.2025.03.015
藏东南色季拉山不同海拔土壤团聚体特征及影响因素
Characteristics and influencing factors of soil aggregates at different altitudes in Sygera Mountain,southeastern Xizang
摘要
Abstract
[Objective]This study aims to explore the spatial differentiation patterns of soil aggregates and their influencing factors within mountain ecosystems,providing theoretical support for ecological studies on the rational utilization of soil resources and soil conservation mechanisms at the regional scale in southeastern Xizang.[Methods]Soil samples from different depths were collected at altitudes of 3 500 m,3 900 m,and 4 300 m in southeastern Xizang.Dry and wet sieving methods,along with Pearson correlation analysis,were used to examine the relationship between soil aggregate characteristics and soil physicochemical properties.[Results]Bulk density(BD),soil erodibility(K value),and fractal dimension(D)significantly increased with increasing soil depth,whereas non-capillary porosity(NCAP),ammonium nitrogen(NH4+-N),nitrate nitrogen(NO3--N),soil organic carbon(SOC),total nitrogen(TN),available phosphorus(AP),available nitrogen(AN),water-stable aggregate content(WSA),and geometric mean diameter(GMD)significantly decreased with increasing soil depth.WSA,mean weight diameter(MWD),and GMD showed a trend of first increasing and then decreasing with altitude,peaking at 3 900 m.The fractal dimension(D)was the highest at 4 300 m.VWC was negatively correlated with aggregate stability at 3 900 m,while AP was positively correlated.At 4 300 m,AP,NCAP,capillary porosity(CAP),NH4+-N,TN,SOC,and AN were positively correlated with aggregate stability,whereas NCAP,NH4+-N,TN,SOC,and AN were negatively correlated with the K value and fractal dimension(D).[Conclusion]The stability of soil aggregates and soil erosion resistance increases with altitude,peaking at 3 900 m,and then declined.The interaction between soil aggregates and soil physicochemical properties at higher altitudes is found to be the closest and most complex,with AP identified as the most important factor affecting the stability of soil aggregates at middle and high altitudes.关键词
山地生态系统/森林土壤/海拔/土壤团聚体/理化性质Key words
mountain ecosystem/forest soil/altitude/soil aggregate/physicochemical properties分类
农业科技引用本文复制引用
郭亮娜,丁慧慧,李江荣..藏东南色季拉山不同海拔土壤团聚体特征及影响因素[J].水土保持研究,2025,32(3):81-90,10.基金项目
西藏农牧学院人才队伍建设资助项目(XZNMXYRCXM-2024-10) （XZNMXYRCXM-2024-10）
西藏农牧学院研究生创新计划项目(YJS2021-23) （YJS2021-23）
西藏自治区科技创新基地自主研究项目(XZ2022JR0007G) （XZ2022JR0007G）
科技部国家野外科学观测研究站(生态系统)运行补助项目(2020-2025) （生态系统）
