土壤学报2025，Vol.62Issue(5)：1259-1270,12.DOI:10.11766/trxb202407080276
三峡库区紫色土不同植被类型土壤抗蚀性能差异研究
Differences in Soil Erosion Resistance Between Different Vegetation Types of Purple Soil in the Three Gorges Reservoir Area
摘要
Abstract
[Objective]Soil erosion resistance reflects the vulnerability or sensitivity of soil to erosion,which is a critical parameter utilized for soil erosion prediction and is of significant importance for predicting regional soil erosion and adjusting land use patterns.Nevertheless,the potential effect as well as their driving mechanism of vegetation types on soil erosion resistance is still scarce in the purple soil of the Three Gorges Reservoir Area.Therefore,this study aimed to explore the potential effect of vegetation types on soil erosion resistance and decipher the influencing mechanisms of purple soil in the Three Gorges Reservoir area.[Method]Based on a full field investigation in the Qinling watershed of Zhongxian County in the Three Gorges Reservoir area,seven typical vegetation types of the coniferous forest of Cupressus funebris Endl.(CF)and Pinus massoniana Lamb.(PM),broadleaf forest of Eucalyptus spp.(E),Citrus reticulata Blanco.(CR),shrub(S),grassland(G)and maize(M)were selected.Combined with the field sampling and indoor analysis,difference analysis,correlation analysis,redundancy analysis and path analysis,the differences as well as the main influencing factors of soil erosion resistance between different vegetation types were comprehensively analyzed.[Result]The comprehensive soil erosion resistance index(CSRI)varied from 0.05 to 0.72 between different vegetation types,among which maize had the minimum CSRI,then followed by CR,G,E,PM,S and CF.Moreover,CSRI varied significantly between different vegetation types with the CSRI of SL and CR being significantly lower than that of other vegetation types.Compared to M,CSRI of CR,G,E,PM,S,and CF increased by 210%,407%,779%,816%,1095%and 1217%,respectively.Differences in CSRI between different vegetation types were closely related to near-surface soil properties and vegetation characteristics.Correlation analysis indicated that CSRI was significantly positively correlated with organic matter content,water-stable aggregates content,total porosity,clay content,litter weight of the semi-decomposed layer,and root mass density,whereas significantly negatively correlated with bulk density(P<0.05).The results of redundancy analysis showed that water-stable aggregates,clay,and organic matter contents were the main factors controlling the differences in CSRI between different vegetation types,which could explain 64%of the total differences.However,the influencing mechanism of vegetation types on CSRI in purple soil was different from most previous studies carried out in other regions.Influenced by the formation process of purple soil,variation in CSRI between different vegetation types was dominantly controlled by clay content via its direct effect and indirect effect through increasing organic matter and water-stable aggregates contents.[Conclusion]Sloping land and orchard land are still the potential areas of soil erosion in the Three Georges Reservoir area since it has the minimum CSRI.Cupressus funebris Endl land can be promoted as soil and water conservation species in the reservoir area.The relevant research results can provide a scientific basis for the adjustment of land use structure and the selection of tree species for soil and water conservation,to realize the green and sustainable development of the Three Georges Reservoir area.关键词
土壤抗蚀性能/植被类型/紫色土/三峡库区Key words
Soil erosion resistance/Vegetation type/Purple soil/Three Gorges Reservoir area分类
农业科学引用本文复制引用
冯滔,陈晓燕,朱平宗,潘振桦,杨澜,王定斌..三峡库区紫色土不同植被类型土壤抗蚀性能差异研究[J].土壤学报,2025,62(5):1259-1270,12.基金项目
国家自然科学基金项目(42307422)、中央高校基本业务费项目(SWU-KQ22039)和西南大学研究生科研创新项目(SWUS23090)共同资助 Supported by the National Natural Science Foundation of China(No.42307422) （42307422）
Central University Basic Operating Expenses(No.SWU-KQ22039)and Postgraduate Research Innovation Project of Southwest University(No.SWUS23090) （No.SWU-KQ22039）
