Analysis the influence of grassland degradation in Du Meng County of Heilongjiang Province

In recent 50 years, because of the interference of natural factors and human activities, the quality, productivity and the carrying capacity were decreased of Dumeng Country grassland in Heilongjiang Province.According to the division of county, Dumeng County township is determined disturbed grassland and none disturbed grassland in this study.Using sensing data of satellite remote, which is getting unit NDVI integral of every land.Analyzing the influence of human factors on grassland productivity by calculating the grassland relative degradation index.Finally, the relative degradation index and climate of the grassland productivity and human influence factors were analyzed.According to the result of grassland degradation index, combined with the villages and towns cultural statistics, found out the main human factors and affected the grassland productivity.Results show that the main human factors affect the Dumeng county grass productivity is the total population and the number of large livestock.And the principal component analysis results show that the load of the first and second principal components reached 71.635%;The correlation coefficient of Dumeng county total population and relative grass degradation index reached 0.733.The correlation coefficient of the number of large livestock and relative grass degradation index reached 0.603.The correlation level both reached 0.01 level.According to two regression methods based on the relative degradation index comparison, found that the curve regression method for Dumeng county each villages and towns of grassland degradation index of fitting effect is good, the main human factors affecting the majority of villages and towns grassland productivity is the total population.