VEGETATION COVER AND ITS RELATIONSHIP WITH ENVIRONMENTAL FACTORS AT DIFFERENT SCALES IN THE ORDOS REGION OF CHINA The impact of interannual climate variability on mean global vegetation distribution Research on effects of soil erosion on vegetation development and succession of plant resistance to erosion The climate change and alpine grassland on the Tibetan Plateau Analysis of Vegetation Character in Kumtag Desert Application of Adaptive Cluster Sampling in Multi-Resource Inventory