西藏中部草地及农田生态系统的退化及其机制

Degradation and its mechanism of grassland and cropland ecosystem in the middle part of Tibet

西藏中部农田,特别是兼具草地与林地两大功能的草地生态系统对区域生态环境具有重要的调节和控制作用。近年来,草地及农田生态系统呈现出整体退化及日趋严重的态势,并逐步成为西藏风蚀沙化、水土流失等最为严重的地区。文章在阐述退化生态系统的内在特征及其环境效应的基础上,就草地及农田生态系统退化的发生机制进行了深入分析。

The cropland ecosystem, especially grassland ecosystem possessed important effect of regulation and domination in the ecology environment in the middle part of Tibet. In recent years, degradation of grassland and cropland ecosystem is increasingly serious which in whole affects and restricts the sustainable development of economy in the region, and progressively becoming the most serious section of weather arid, wind erosion and soil erosion. Degradation mechanism of grassland and cropland ecosystem is deeply analyzed on the basis of the discussion the internal characteristics, external obstructions and environment effect of degradated ecosystems.