水土保持通报2024，Vol.44Issue(3)：46-55,10.DOI:10.13961/j.cnki.stbctb.20240528.003
黄土坡面种植柠条对土壤团聚体稳定性和可蚀性的影响
Effects of Caragana Korshinskii Plantation on Soil Aggregate Stability and Erodibility on Loess Slopes
摘要
Abstract
[Objective]The effects of a long-term Caragana korshinskii plantation on the stability of soil aggregates and erodibility on loess hilly slopes were determined,in order to provide theoretical support for artificial vegetation construction and ecological restoration in the Loess Plateau region.[Methods]A barren grassy slope was compared with C.korshinskii plots of different plantation ages(15,25,35 years)along similar slope contour lines.the characteristics of changes in soil aggregate stability and erodibility due to a long-term C.korshinskii plantation was analyzed,as well as the main influencing factors.[Results]① The soil aggregate stability indicators[i.e.,mean weight diameter(MWD),geometric mean diameter(GMD),and the content of aggregates＞0.25 mm(WR0.25)]generally followed the order of 15-year C.korshinskii plantation＞barren grassy land＞25-year C.korshinskii plantation＞35-year C.korshinskii plantation.In terms of slope position,the order was bottom slope＞top slope＞mid-slope＞upper slope.Conversely,the soil erodibility K factor exhibited an opposite trend.② As C.korshinskii plantation age increased compared with barren grassy land,soil aggregate stability indicators initially increased and then decreased,while the stability of barren grassy strips continuously declined.The difference between the two became more pronounced after plantation age exceeded 15 years,especially at the bottom slope.③ Soil organic carbon and slope position were the main factors influencing soil aggregation stability and erodibility on the slope,explaining 38％and 4.1％of the variation,respectively,followed by plantation age and altitude.[Conclusion]Strip planting of C.korshinskii on loess hilly slopes affected the distribution of soil organic carbon,thereby influencing soil aggregate stability and erodibility.Plantations of less than 15 years contributed to an increase in soil aggregate stability and a reduction in erodibility,but a reverse trend gradually emerged with older plantations,particularly at the bottom slope locations.关键词
柠条/种植年限/土壤团聚体稳定性/土壤可蚀性Key words
Caragana korshinskii/plantation years/soil aggregate stability/soil erodibility分类
农业科技引用本文复制引用
杨璐,刘小芳,巨佳敏,张秀敏,常富强,赵勇钢..黄土坡面种植柠条对土壤团聚体稳定性和可蚀性的影响[J].水土保持通报,2024,44(3):46-55,10.基金项目
国家自然科学基金项目"黄土丘陵区植物根系与土壤大孔隙对优先流的影响"(42007064) （42007064）
山西省研究生教育创新项目"晋南黄土区灌草坡地土壤优先流形成的驱动机制"(2022Y486) （2022Y486）
山西省自然科学研究面上项目(202203021221133) （202203021221133）
