水土保持研究2025，Vol.32Issue(5)：1-10,10.DOI:10.13869/j.cnki.rswc.2025.05.031
刺槐人工林林龄对土壤团聚体稳定性和土壤可蚀性的影响
Effects of the age of Robinia pseudoacacia on soil aggregate stability and soil erodibility
摘要
Abstract
[Objective]The study aims to elucidate the dynamic changes in soil aggregates and soil erodibility during the restoration process of Robinia pseudoacacia forests within the loess region of western Shanxi Province.This is intended to provide a scientific basis for ecological restoration and soil and water conservation evaluation.[Methods]The stability indexes of soil aggregates in the 0-30 cm soil layer were determined by using the spatiotemporal substitution method for R.pseudoacacia plantations of different stand ages(18 a,22 a,26 a,30 a,33 a,40 a),with natural grassland as a control.The differences in soil aggregate stability and soil erodibility(K)across forest ages and soil depths were analyzed,and the influencing factors were further explored.[Results](1)Soil aggregates of R.pseudoacacia forests of different stand ages were mainly>0.25 mm,with an average mass fraction of 48.86%.The content of soil aggregates>0.25 mm(WR0.25),mean weight diameter(MWD),and geometric mean diameter(GMD)all increased significantly with stand age,while the aggregate breakdown rate(PAD)and fractal dimension of aggregates(D)showed an overall decreasing trend.The stability of soil aggregates in R.pseudoacacia forests was significantly better than that in grassland plots.(2)Within the same soil layer,soil erodibility showed a trend of first increasing and then decreasing with increasing forest age,with the strongest soil erosion resistance observed at 33 years of restoration.At the same forest age,surface soils exhibited stronger erosion resistance than subsoils.(3)Soil aggregate stability and erodibility were directly influenced by the distribution of particle size fractions.Biomass and organic matter content facilitated the formation of aggregates in the 5 mm and 2～5 mm fractions,which were the main factors affecting the stability of soil aggregates.[Conclusion]The establishment of R.pseudoacacia forests in the loess region of western Shanxi Province improves the structural stability of soil aggregates and enhances soil resistance to erosion,with the strongest erosion resistance observed at approximately 33 years of forest age.关键词
土壤团聚体/土壤可蚀性/植被恢复/刺槐林/晋西黄土区Key words
soil aggregates/soil erodibility/vegetation restoration/R.pseudoacacia/loess region of western Shanxi Province分类
农业科技引用本文复制引用
韩金丹,毕华兴,赵丹阳,林丹丹,陆善洪..刺槐人工林林龄对土壤团聚体稳定性和土壤可蚀性的影响[J].水土保持研究,2025,32(5):1-10,10.基金项目
国家重点研发课题(2022YFF1300401) （2022YFF1300401）
国家自然科学基金项目(U2243202) （U2243202）
