【摘要】 人工植被的固定沙丘结皮层土壤微生物数量多,土壤酶活性强,结皮层较厚,韧性也强,其次是半固定沙丘结皮层.流动沙丘表层较差.固定沙丘和半固定沙丘相同土层土壤微生物数量、土壤酶活性强度虽然不同,但其消长以及土壤理化性质变化趋势基本相同.流动沙丘各土层则明显不同于前者。更多还原

【Abstract】 The research showes that in the sand dunes which were fixed with artificial vegetation and had formed a thick and tenacious crust, the soil microbe population was in large amounts, and enzyme activity was strong. In the shifting sand dunes, however, there existes a small quantity of soil microorganisms. Although the soil microbe population and enzyme activities in the fixed sand dunes and the fixing ones, were different, their tendencies of growth it, upward or downward, were basically similar bacause of similer physicochemical properties in the identical layers of soil. Nevertheless, the results sharply contrasted with those in the shifting sand dunes.更多还原