盐渍化沙地土壤旱化过程中植被的变化

利用地下水位高低不同地区所形成的不同立地类型水平空间上的分布来代表盐渍化土壤沙化旱化过程时间分布上的发展,分5种立地类型探讨盐渍化土壤干旱沙化过程中植被的演变特征.随着地下水位的降低,各立地类型土壤上植物种类减少,植被盖度降低,相邻植物群落中共有种逐渐增加,变异性减少,植被演变趋势从湿生-中生耐盐-沙生旱生植物过渡.

The change of vegetation during soil aridity in saline land

Using the horizontal spatial distribution of different land types which is formed in areas with different underground water table, to present the time development of the process of sand desertification and soil aridity, the characters of the succession of vegetative community on 5 land types were studied during the process of sand desertification and soil aridity of salinized soil. With the fall of underground water table, number of plant species of all land types decreased; vegetative cover reduced~ the common species of neighboring vegetative communities gradually increased; variation decreased; the succession trend transited from hygrophyic to mesophyic to psamophyic and xerophyic vegetations.