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Nitrogen cycle and content in plowable soil layer under different land-use types in Dongting Lake region Effects of different land-use types on soil enzyme activity in karst mountain areas of Southwest Guangxi The effects of different land-use types on quality of urban soils Study on the Regularities of Wind-Erosion of Different Land-Use Types in Yongding River Sand Land,Beijing Characteristics of Soil Water Stable Aggregates under Different Land-Use Types Effects of land use types on particle size distribution of reclaimed alluvial soils of the Yangtze Estuary Soilmicrobial biomass and active characters under different land-use types in karst mountain areas of southwest Guangxi