Biological factors influencing nitrogen transformation in wheat fields of lime concreted black soils and their response to different nitrogen supplications Analysis of functional diversity of soil microbial communities under different cultivation patterns at different growth stages of maize Effects of phosphorus supply on microbial carbon source utilization and functional diversity of maize rhizosphere Research progresses of farmland microorganisms in fluvo-aquic soil of China Effects of continuous potato cropping on the diversity of soil microorganisms Effects of soil amendments on rhizosphere microbial number, soil enzyme activity and yield of continuous cropped American ginseng Effect of Ageratina adenophora (Spreng.) and Flaveria bidentis (Linn.) invasion on soil microbial community and Oryza sativa L. growth