西藏高寒地区不同边坡生态修复类型土壤的肥力变化

目的]对西藏DG水电站6种不同边坡生态修复类型土壤的肥力变化进行对比研究,为西藏水电工程扰动区生态环境的修复提供理论依据和技术支撑.方法]采用实地测量和室内试验等方法,分析不同边坡生态修复类型的肥力变化特征及植被生长情况,并用相关性分析确定边坡土壤肥力时空变化与植被生长情况之间的相关性,探讨影响边坡植被生长土壤的肥...

Soil Fertility Changes of Various Slope Ecological Restoration Types in Tibet Alpine Region

Objective] A comparative study of the fertility changes in six different slope ecological restoration types was conducted, in order to provide theoretical basis and technical support for the ecological environment restoration in the DG hydropower project disturbed area, Tibet, China. Methods] Field measurement and laboratory tests were conducted to analyze the fertility change characteristics and vegetation growth status in different types of slope ecological restoration. The spatio-temporal changes of soil fertility and its correlation with vegetation growth were determined by the correlation analysis method, and the main control factors of the fertility in vegetation growth were discussed as well. Results] The fluctuation of organic matter and nitrogen elements changed greatly in the six types of slope ecological restoration, which decreased first, then increased, and decreased finally with the seasonal change, while the change of pH value, available phosphorus and available potassium were relatively small. From the comparison of different slopes, the soil fertility from high to low showed as: spoil ground > soil slope > general construction site > earth rock mixed slope > rock slope > construction hardened surface. The vegetation restoration and growth status of different slopes showed the same order as the soil nutrient content. The ammonia nitrogen, nitrate nitrogen and available phosphorus had the highest correlation with vegetation growth, followed by available potassium and organic matter, while pH value had the lowest correlation, indicating that ammonia nitrogen, nitrate nitrogen and available phosphorus had the greatest impacts on slope vegetation growth. Conclusion] Among the fertility conditions of different slopes, the performance of spoil ground is the best, while the restoration of rock slope and construction hardened surface is the poorest, and the contents of ammonia nitrogen, nitrate nitrogen and available phosphorus in fertility are closely related to vegetation growth.