雅砻江官地水电站生态护坡工程初期土壤肥力状况

Soil Fertility in Preliminary Stage of Ecological Slope Protection for Guandi Hydropower Station on Yalong River

以雅砻江官地水电站生态修复工程为例,对种植槽客土回填植草技术(ESS)和植被混凝土基材生态防护技术(CBS)在工程扰动区应用初期的土壤肥力状况进行了研究。通过选取4块具有一定代表性的生态恢复边坡样地及一块对照样地,对各样地的土壤肥力相关指标进行了测定,同时应用土壤标准综合级别法分析了土壤肥力的变化。结果表明,4块修复边坡样地土壤中有机质、全氮、全磷、速效氮、速效磷和速效钾含量均高于对照样地,同时土壤肥力水平亦显著高于对照边坡,其中右岸植被混凝土边坡肥力最高。说明生态护坡技术可有效改善官地水电站工程扰动区的土壤环境,其中以植被混凝土护坡技术效益最为显著。

Two ecological restoration technologies,i.e.,vegetation-growing concrete base material spraying technology（CBS）and the external-soil spray seeding technology（ESS）,were applied in ecological restoration area of the Guandi Hydropower Station on the Yalong River to study soil fertility in the preliminary stage of ecological restoration.Six soil fertility indexes were measured by selecting four ecological restoration slopes and one contrast slope.Then the method of standard comprehensive assessment on fertility grade was employed to analyze the variation of soil fertility.Results showed that the contents of soil organic matter,total nitrogen,total phosphorus,available nitrogen,available phosphorus and available kalium on the four ecological restoration slopes were larger than the contrast slope.The soil fertility on the four slopes was also significantly higher than the contrast slope.The slope on right riverbank with CBS applied had the highest soil fertility.Therefore,the two ecological restoration technologies can improve soil quality in the study area,but the benefits of using CBS were better than ESS.