Study On Desert-steppe Eco-environment Quality Evaluation Of Inner Mongolia

Inner Mongolia desert grassland distributed scope is wide,area is large,it takes very special position at own court and even animal husbandry manufacture in our country. Therefore it takes more attention at its environment ecology.This paper roundly considered the complexity and particularity of ecological environment system, based on the survey of desert grassland vegetation and environment factors. By expert questionnaire, we selected 4 factors--weather,vegetation,soil,livestock and 20 indexes to composite quality evaluate system of desert grassland ecology, and calculated the weight of evaluate index by factor analysis in mathematic statistical method. This paper revealed the environment quality of vegetation and recent 20 years'changing condition with accurate quantitative analysis data.Through the evaluated index system of Inner Mongolia desert grassland, we obtained comprehensive index by comprehensive evaluation index calculation formula, and then we divided Inner Mongolia desert grassland into four ecological environment grade. The grades were excellent,better,general and poor. The results showed that the first grade region distributed mainly at the middle and north of Wulate Middle Banner,the east of dalad-qi,northern part of Zhungeer-qi and northwest and southeast of Hangjin-qi have partial distribution. The total area is 3051 km2. The second grade is mainly distributed at the middle and northwest of Wulat Middle Banner,the east and west of Hangjin-qi,the south of Damao-qi,the south of Wulate-houqi and the west and middle of Dalate-qi. The total area amounts to 6913 km2. The third grade mainly distributed at Siwang-qi,Etuoke-qi,Etuokeqian-qi, and the middle of Hangjin-qi and Dalate-qi had little distributions. The total area is up to 38175 km2. The fourth grade region mainly distributed Sunitezuo-qi,Suniteyou-qi,the east of Damao-qi,the middle of Wulateqian-qi,the south of Wulatezhong-qi,the east of Wulatehou-qi,the east of Wulatehou-qi,the middle of Dalate-qi and the south of Hangjin-qi. The gross area attains to 38170 km2. In a whole, the Eco-environment quality of Inner Mongolia desert grassland was poor and ecological environment was worse. This assessment is essential consistent with the actual eco-environment quality of Inner Mongolia desert grassland.By dynamic comparison in Inner Mongolia desert grassland environment between the 20th century 80s and early of the 21th century, It was found that the eco-environment quality of Inner Mongolia desert grassland have changed greatly. The area of theâ… grade reduced 4535 km², the reduced range was 28.3%; Theâ…¡grade region area is 8665 km² in 1980s, and there are 11440km² in early of the 21th century, it increased about 2700 km²; Theâ…¢grade region area approximately increased 8200 km² compared to the 20^th century 80s, the increased range was 56%;The Area ofâ…£grade, which is the worst, is 48897km² at 20^th century 80s,this century initial is 45691km²,it reduced about 3200km2.