Characteristics of Soil Properties to Land Use/Cover Change in Hongjiannao Watershed

Effects of land use/cover change on soil properties caused by water change were studied in Hongjiannao watershed in the sub-arid desert area. The results showed that land use/cover types in the watershed changed along with the water level,which were salt swamp,swampy meadow,grassland,sand grassland and sand. According to this trend,sand grains content in soil increased while clay and silt grains decreased,and soil moisture content reduced by 19.17% ~82.20%.Compared with salt swamp,soil organic matter in other land use types reduced by 7.73%,32.01%,52.32%,53.42%respectively,total N reduced by 2.05%,4.46%,31.56%,34.15% respectively,and total P reduced by 34.82%,36.80%,31.40%,47.25% respectively. Meanwhile,soil organic matter,total N and total P in underlying soil(30~50 cm)were more different than that in surface soils of various land cover types. Soil organic matter,total N and total P were significantly correlated with soil particle composition.