The Coupling Relationship Between Micro Topography And Vegetation In The East Edge Of Hunshandake Sandland

Because of the long serious desertification on Hunshandake Sandy, it restricted the sustainable development of the ecological environment, so the sand governance is urgently needed. This paper, we studied the trees, shrubs and herbaceous vegetation, by studying the CCA ordination between environmental factors and vegetation, all levels of vegetation niche and interspecies affinity, the findings of a study of forest and grass, analysis of coupling relationship between the microtopography and vegetation in the eastern margin of Hunshandake Sandy. The results showed:(1)The trees, shrubs and herbaceous layer vegetation distribution and micro topography have a significant correlation in the eastern margin of Hunshandake Sandy. Terrain factor, soil factor and disturbance factor have combined effects on the number of vegetation community characteristics and species diversity characteristics. Aspect was the dominant factor of leading to vegetation and soil small-scale spatial variation.(2) There are 7 kinds of trees in the leeward slope, only 3 kinds of trees in the windward slope and inter-dunes in the east edge of HunShanDaKe sand; shrubs and herbs are the most species in the leeward slope. At the same time, the ecological niche and interspecific affinity of arbor, shrub and herb layer has obvious differentiation in different site resources. Among them, the tree species of Ulmus pumila in three stand conditions have broad niche and adaptability.(3) The growth of White birch have bigger influence on the shrub and herb which growing in forests. When the proportion of White birch account for tree layer reaches 20%～25%, the species, coverage and diversity of shrub and herb layer were large.