RESEARCH ON THE QUANTITATIVE ANALYSIS OF THE NATURAL GRASSLAND TYPES IN HUTUBI COW BREEDING FARM
新疆呼图壁种牛场天然草地类型数量分析研究

Hutubi Cow Breeding Farm is localed in the border of the alluvial fan and the paleo-alluvial plain of the northern slope of Tianshan Mountain,The zonal grassland type in this region is desert and the interzonal grassland typeis low land rneadow,The formation and distribution of grassland types aremainly controlled by topography,ground water and soil salinity.Using methods of TWINSPAN and polythetic hierarchical agglomerativeclassification, the grassland types are divided into 16 types and their hierar-chical classification system is formed. The ecological gradient in this regioncan be given by DCA ordination and the interpretation of its quantitative en-vironment can aslo be given after multivariate regression analysis. The resultshows that the grassland types and their distribution are strongly correlatedwith soil moisture,soil salinity and soil texture.