生态退化得到有效控制

　　高寒草地是青藏高原最主要的生态系统类型，发挥着重要的生态安全屏障功能，也是高原畜牧业的基础。由于气候变化和超载过牧等原因，高寒草地不断退化，至20世纪80年代中期，西藏自治区和青海省的草地面积为82万平方公里。此后，随着退牧还草、草原生态保护补助奖励政策以及草原鼠虫害防治等一系列草地生态保护建设工程的陆续实施，青藏高原草地保育成效逐步显现。研究表明，1982－2009年，青藏高原草地覆盖度和净初级生产力总体呈增加态势，草地覆盖度增加的区域约占草地总面积的47%，净初级生产力明显增加的面积达32%以上。近十年来，草地生态系统稳定向好。

Ecological degradation is under control.

Alpine grassland is a major ecosystem on the Qinghai-Tibet Plateau, playing an important role as an eco-safety barrier, and serving as the basis of highland animal husbandry. Climate change, overgrazing and some other reasons caused continuous degradation of alpine grasslands. By the mid-1980s, the grassland area in Tibet Autonomous Region and Qinghai Province had been reduced to 820,000 sq km in total. Later, due to the implementation by the government of such policies as issuance of allowances for restoring grazing land to grassland and protecting the grassland ecosystem, and the undertaking of a number of grassland ecological conservation projects, such as pest and rodent prevention and control, progress was made in grassland ecosystem conservation on the Qinghai-Tibet Plateau. According to research, from 1982 to 2009 the grassland coverage rate of Qinghai-Tibet Plateau and its net primary productivity (NPP) showed an overall increase, with newly-added grassland coverage accounting for 47 percent of the total, and the area with a dramatic NPP increase reaching more than 32 percent of the total. In the recent decade, the local grassland ecosystem has maintained steady and positive improvement.