A study on dividing the ecological environmental area for the northwest dry grasslands of China

摘要

The author successfully established the drought-resistance forage seeds base during the National Fifteenth Plan. The fruitful achievements include a wide investigation of dry grasslands in northwest China, the introduction, domestication, and propagation of more than 30 kinds of drought-resistance forages, and the quantitative definition of ecological types of stress-resistance forages. The four indices (geographical position, water and warm conditions, soil texture, and the plant communities), suggests that the northwest dry grasslands can be divided into four ecological areas: the plateau basin of extreme dry desert grassland; the arid and semiarid area of the Loess Plateau; the farm pasture intersected belt of the Tibet and the Loess Plateau; and the man-made grasslands. On the basis of the ecological types of stress-resistance forage, the article, puts forwards the view that forage seeds should be planted in the ecological area to which they are adapted in order to best implement ecological environmental reconstruction in West China.