关键词: 青藏高原, 沙漠化, 成因与防治

Abstract: The Three Rivers Drainage Basins,including Jinsha River,Lanchang River and Nujiang River in eastern Tibetan,are the main compositions of River Source and Ecological Source.Precipitation,snow-cover,climate and vegetation as well as ecological change in resources developing process in this area have great effect on the environment of the neighboring regions.In recent years,influenced by global warming and human irrational development to natural resources land desertification is becoming serious,which directly threaten the local ecology and the economy.This paper has proposed the countermeasures of desertification control based the background investigation and the forming causes analysis.In order to protect the ecological environment of the Three Rivers Discharge Basins the main measures to combat desertification are the following:(1) close sandy ground to fertilitate grasses,control the number of animal husbandry,scientifically rotation pasturing for lightening the pressure of grassland according to its capacity;(2) establish and improve the farmland protecting system,adopt scientific cultivating ways for decreasing soil erosion;(3) plant ecological forest according local conditions.

Key words: Qinghai-Tibetan plateau, desertification, causes and control