黄土坡面种植柠条对土壤团聚体稳定性和可蚀性的影响OA北大核心CSTPCD
Effects of Caragana Korshinskii Plantation on Soil Aggregate Stability and Erodibility on Loess Slopes
[目的]探究黄土丘陵区坡面长期种植柠条对土壤团聚体稳定性和可蚀性的影响,为黄土高原人工植被建设和生态环境恢复提供理论依据.[方法]以荒草坡地为对照,选取坡面沿等高线种植的不同年限(15,25,35 a)柠条地为研究对象,分析长期种植柠条对坡面土壤团聚体稳定性和可蚀性的变化特征的影响及其主要影响因素.[结果]①样地土壤团聚体稳定性指标中平均重量直径(MWD)、几何平均直径(GMD)和＞0.25 mm团聚体含量(WR0.25)总体表现为:15 a柠条地＞荒草地＞25 a柠条地＞35 a柠条地,在坡面位置上表现为:坡下＞坡顶＞坡中＞坡上.土壤可蚀性因子K值则有相反的趋势.②随着柠条种植年限的增加,相较于荒草地,各坡位柠条带土壤团聚体稳定性指标均呈先增后降的趋势,间隔荒草带则持续降低.两者的差值在柠条种植年限大于15 a后逐渐扩大,且在坡下位置最为明显.③土壤有机碳和坡位是影响坡面土壤团聚体稳定性与可蚀性的主要因素,分别解释了 38.0％和4.1％的变异,其次是种植年限和海拔高度.[结论]黄土丘陵区坡面带状柠条种植通过影响土壤有机碳分布,进而影响土壤团聚体稳定性和可蚀性.柠条种植小于15 a有助于土壤团聚体稳定性的提升和可蚀性的下降,但大于15 a后逐渐有相反趋势,尤其在坡下位置.
[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.
杨璐;刘小芳;巨佳敏;张秀敏;常富强;赵勇钢
山西师范大学生命科学学院,山西 太原 030031
农业科学
柠条种植年限土壤团聚体稳定性土壤可蚀性
Caragana korshinskiiplantation yearssoil aggregate stabilitysoil erodibility
《水土保持通报》 2024 (003)
46-55 / 10
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);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);山西省自然科学研究面上项目(202203021221133)
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