Dari County had 167 700 hm 2 BSTDG in 1985 and 575 000 hm 2 in 1994, which area increased by 14.75% average every year, and this trend damaged the ecological environment of the river source and the sustained development of the animal husbandry.

• 据统计，青海省达日县1985年“黑土型”退化草地为16.；77万hm2，1994年猛增到57