The Impact on Vegetation Dynamic of Human Activities in the Southwest China Karst

Abstract

Recent trend analyses have indicated the spatial variations of vegetation dynamic in South China Karst region, such as growth in west and southwest, degradation in northwest and southeast. Whether the factories lead to vegetation degradation would be identical to the factories lead to growth was investigated in this study. The result shows that(1)about 11.5% of the total study areas have experienced a significantly decrease in the annual NDVI, and 7.8% was significant increase. The proportion of vegetation degradation was higher in spring and summer than in autumn and winter, vegetation growth were opposite. (2)The relation between NDVI and climate variation was weaker in the region scale. (3)The impact of human activities on vegetation dynamic was bidirectional. The negative influence was bigger than positive. Keywords—vegetation dynamic; NDVI; human activities; land cover; south China karst