科尔沁沙地奈曼旗固沙造林沙丘土壤微生物区系的变化

在科尔沁沙地西南部的流动沙丘上固沙造林,不同造林时间和不同造林树种的沙丘土壤中细菌、放线菌和真菌等类群和生理群的微生物生长情况不同、林地土壤中微生物都比流动沙丘中繁殖旺盛。造林时间长的沙丘又比造林时间短的沙丘土壤微生物增殖量大。有林木生长的沙丘上层土壤也比下层土壤微生物的数量大,沙丘结皮层中尤为明显。

Microf lora Variations of Afforested sand Dune Soil in Naiman Banner,Horqin Sandy Land

The studies conducted in afforested sand dunes of southwestern Horqin sandy land showde that the microbial population such as bacteria,actinomycst and fungi as well as their physiological groups in afforested sand dunes are more than in shifting sand dunes,and varied greatly with the forest ages and species.Their populations are higher in the old afforested sand dunes than in the new ones.Their amounts are more in upper layers of afforested sand dunes than in the subsoil layers.