Changes in Soil Microbial Amount and Biomass During the Development of Chinese Fir Plantation Effect of incorporating corn residues into soil on nitrogen transformation in soil-plant ecosystem TURNOVER OF MICROBIAL BIOMASS IN RHIZOSPHERE SOILS OF CLOVER AND RYEGRASS Seasonal dynamics of soil microorganisms and soil nutrients in fast-growing Populus plantation forests of different ages in Yili, Xinjiang, China Impacts of biological soil crusts on soil nitrogen in different rainfall regions in hilly areas of the Loess Plateau, China Effects of Astragalus sinicus manure and fertilizer combined application on biological properties of soil in Anhui double cropping rice areas along the Yangtze River