向家坝水电站不同修复模式边坡土壤生物量研究

以向家坝水电站工程扰动区2处不同修复模式样地以及1处天然林样地土壤为对象,研究了不同修复模式边坡土壤理化性质及微生物量,以揭示该工程扰动区不同修复模式对土壤质量的影响。结果表明,天然林样地土壤微生物量和有机碳含量均高于人工修复边坡;土壤p H值从大到小为植被混凝土基材、客土喷播、天然林。相关分析显示,土壤微生物量与有机碳呈相关性,表明向家坝工程扰动区边坡土壤微生物量与土壤有机质紧密相关;土壤C/N与有机碳呈显著正相关,说明向家坝水电站坝址扰动区不同边坡土壤C/N的变化主要由有机碳决定。

Research on soil microbial biomass on slope of Xiangjiaba Hydropower Station under different conservation modes

Two different conserved plots and a natural soil plot at Xiangjiaba Hydropower Station disturbed area in Sichuan Province are taken as example to study the physicochemical properties and microbial biomass of slope under different conservation mode and reveal the influence of different conservation modes on soil quality. The result show that the microbial biomass and or-ganic carbon content of natural forest slope was higher than that of conservation slope;the pH of vegetation concrete substrates is the largest, followed by foreign-soil spraying and natural forest. The correlation analysis showed that the organic carbon related with microbial biomass, suggesting that the microbial biomass and soil organic matter of slope soil in the disturbed area are closely related;the soil C/N and organic carbon was positively correlated, indicating that the changes of slopes C/N under various con-servation modes is primarily determined by the organic carbon.