草业学报2025，Vol.34Issue(11)：40-52,13.DOI:10.11686/cyxb2024514
典型地表覆盖物对西南丘陵山区梯田边坎土壤可蚀性的影响
Effects of typical surface cover types on the soil erodibility of terrace risers in the hilly regions of southwestern China
摘要
Abstract
In the hilly and mountainous areas of southwest China,newly constructed terraced field embankments are highly susceptible to rainfall erosion,which can lead to the formation of eroded gullies and severe soil and water losses.In this study,we investigated the effect of different surface cover types on the soil erodibility of embankments.The study was conducted in a newly developed high-standard farmland area in Shizhu County,Chongqing,and soils from terraced embankments with herbaceous vegetation cover,biological crust cover,and bare land cover(control)were analyzed.The results demonstrated that,compared with soil from bare land embankments,soils from embankments with herbaceous vegetation cover and biocrust cover showed significantly increased saturated hydraulic conductivity,mean weight diameter of aggregates,average number of droplets,and soil cohesion,and significantly lower soil erodibility(K-factor),disintegration rate,maximum disintegration rate,and comprehensive soil erodibility index(CSEI).The CSEI of soils from embankments with herbaceous vegetation cover and biological crust cover was 57.7%and 35.6%lower,respectively,than the CSEI of soil from bare land embankments.The changes in the CSEI of soils from different types of embankments were monitored from mid-summer(July)to early winter(November).The CSEI of soils changed over time,and the pattern of change differed among the three types of embankments.The CSEI of soils from embankments with bare land cover and with herbaceous vegetation cover exhibited a gradually decreasing trend over time.The CSEI of soil from bare land embankments decreased from 0.82 to 0.60,and the CSEI of soil from embankments with herbaceous vegetation cover decreased from 0.45 to 0.14.In contrast,the CSEI of soil from embankments with biological crust cover first decreased(from 0.45 in July to 0.24 in August)and then increased(to 0.58 in November).Path analysis indicated that the changes in the CSEI of soil in embankments with herbaceous vegetation cover were mainly driven by soil structural changes due to vegetation growth;the changes in the CSEI of soil in embankments with biological crust cover were closely related to the consolidation effect of the biological crust;and the changes in the CSEI of the soil in bare land embankments were primarily influenced by changes in organic matter content.The results of this study reveal the mechanisms by which different cover types affect the erodibility of soils in terraced embankments,providing scientific technical data and practical guidance for improving the stability of these structures.关键词
土壤可蚀性/梯田边坎/地表覆盖物/水土流失Key words
soil erodibility/terrace ridges/surface cover/soil erosion引用本文复制引用
张胜辉,朱平宗,罗伏林,王定斌,陈晓燕..典型地表覆盖物对西南丘陵山区梯田边坎土壤可蚀性的影响[J].草业学报,2025,34(11):40-52,13.基金项目
重庆市技术创新与应用发展专项(CSTB2022TIAD-LUX0005),重庆市水利科技项目(CQSLK-2023016)和西南大学研究生科研创新项目(SWUS23088)资助. （CSTB2022TIAD-LUX0005）
