Through filed fixed-point monitor and vegetation investigation to the Haloxylon ammodendron plantations with no degradation(ND), slight degradation(SLD), moderate degradation(MD) and severe degradation(SD) growing in the dunes on the edge of Minqin oasis, the vegetation characteristics, species diversity and community similarity were analyzed by calculating the species diversity indices, evenness indices, dominance indices, age structure and similarity coefficient. The results indicated that: There were 4 kinds of shrubs in the regions of ND, SLD and MD respectively and 3 kinds of shrubs in the region of SD, and the replacement procedure of dominant species in shrub layer was H. ammodendron-H. ammodendron, Nitraria tangutorum and Reaumuria songarica-Reaumuria songarica. 9 kinds of herbs were growing in SLD, MD and SD woodland respectively and 6 kinds of herbs were growing in the ND, where the replacement procedure of herb dominant species was Bassia dasyphylla and Halogeton glomeratus-Eragrostis pilosa and Limonium aureum. With aggravating of degradation degree of H. ammodendron plantations, the dynamic changes of age structure of dominant species in shrub layer were as follows: H. ammodendron was stability type-recession type, N. tangutorum was growth form-stability form-recession form and R. songarica was sustainable growth. In the process of deteriorating of H. ammodendron plantations, most of plant community diversity indexes were changed, and overall vegetation of the plantations were changing for more stable trend. The plant community similarity coefficients of the forests had significantly difference each other, which the similar degree between ND and SD was the lowest and that between SLD and MD was the highest. It further indicates that the degradation essence of H. ammodendron plantations was the succession from psammophyte community to xerophyte community because of fixation of soil further result in habitat change. Therefore, R. songarica should be as one of main shrubs applied to restoring and reconstructing dune-fixing pantations on the edge of Minchin oasis.
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