Distribution of light fraction organic carbon under different land use types in the deep soil layer of hilly regions of the Loess Plateau,  China A Review on the Effect of Vegetation Rehabilitation on the Desiccation of Deep Soil Layer on the Loess Plateau Desiccation of deep soil layer and soil water cycle characteristics on the Loess Plateau Effect of revegetation on soil organic carbon concentration in deep soil layers in the hilly Loess Plateau of China Coexistence, biodiversity and roles of ammonia-oxidizing archaea and anaerobic ammonium-oxidizing bacteria in deep soil layer of high nitrogen loaded paddy field