THE EVALUATION OF QINGHAI NATURAL GRASSLAND PRODUCTIVITY

By means of statistic analysis of the grass production,the edible grass production and these grass distribution in time and space in 9 class grasslands,the results show below: the main type grassland belongs to the alpine type which makes up of 85.83% in the whole natural grasslands in Qinghai,the total grass production and the edible grass production respectively take up of 85.54%,83.99% in total production of Qinghai natural grassland.In the last 40 years,the alpine steppe class,the alpine meadow class and the temperature desert steppe all show different degradation,the alpine meadow class,the temperature desert steppe class and the alpine steppe class in orders.Form the view of the spatial distribution,the total edible grass production is 206.06×108kg in the 6 tibetan prefectures,which occupy 91.67% of the total Qinghai province.The results prove that the main natural grassland distributes in the 6 tibetan prefectures in Qinghai province,and the alpine grasslands play the basic role in animal husbandry production.