Characteristics of soil seed bank and standing vegetation change in sandy grasslands along a desertification gradient Seedling banks and their relationship with the standing vegetation under different erosion environments in the hill-gully Loess Plateau region The characteristics of soil seed bank and standing vegetation in differently degraded areas in the lower reaches of Tarim river COMPARISON ON THE DIFFERENCE IN SOIL SEED BANK BETWEEN GRAZED AND ENCLOSED GRASSLANDS IN HORQIN SANDY LAND Relationship between standing vegetation and soil seed bank in Water-level-fluctuating Zone of Three Gorges Reservoir at the beginning after charging water