紫色土区植物篱对坡面土壤微生物特性的影响OA北大核心CSCDCSTPCD

As a significant constituent part,soil microbe,an important index of soil fertility and environment change,has a positive effect on formation of soil fertility and transformation of plant nutrition.On the basis of determination of soil microbial biomass,effect of Leucaena leucocephala hedgerows on 0-20 cm soil microbial characteristics under cropland and economic forest land,10° and 15° in the purple soil area were investigated.Research showed that： Leucaena leucocephala hedgerows obviously increased quantities of bacteria,actinomycetes and fungi,soil microbial biomass carbon and soil microbial biomass nitrogen content.On the whole,the effects of hedgerows on quantities of bacteria,actinomycetes and fungi,soil microbial biomass carbon and soil microbial biomass nitrogen contents under economic forest land were more great than those of cropland,meanwhile,the effects of hedgerows on soil microbe quantities,microbial biomass carbon and microbial biomass nitrogen content in 10° cropland were more great than those of 15° cropland.Moreover,quantities of bacteria,actinomycetes and fungi,soil microbial carbon average contents and soil microbial nitrogen average contents on downhill were significantly more than those of uphill,and quantities of bacteria,actinomycetes and fungi,soil microbial carbon,nitrogen contents of the nearest sampling point to the hedgerows on downhill were much more than others.The results indicated that Leucaena leucocephala hedgerows planting was beneficial to reducing soil fertility decline,immobilization of soil carbon,nitrogen immobilization.