Characteristics and Affecting Factors of Soil Organic Carbon under Land Uses: A Case Study in Houzhai River Basin
To study the relationship between the spatial distribution characteristics of soil organic carbon (SOC) and land use in karst river basins,22 057 soil samples from 2 755 soil profiles were collected with a grid-sampling method at a 150 m scale in the Houzhai River Basin.The SOC density characteristics under different land uses were analyzed.The results indicate that human disturbance,soil thickness and rock outcrop are critical factors to SOC density in the Houzhai River Basin.The land uses in the Houzhai River Basin with SOC density (0-100 cm) in descended order are paddy lands,arid lands,artificial fruit forestlands,garden lands,grasslands,abandoned lands,sloping croplands,arbor-shrub mixed forestlands,arbor forestlands,uncultivated lands,shrub lands and shrub-grass lands.The average SOC density in the top 1 m soil of Houzhai River Basin is 8.70 kg/m2 which is a little lower than the average SOC density in China (10.83 kg/m2),and the SOC storage in the Houzhai River Basin is 5.39 × 108 kg.In conclusion,scientific and reasonable rearrangement and management of land uses could enlarge the SOC storage capacity in a karst river basin.
karst basinland usesoil organic carbonHouzhai River Basin
NETL
NSTL
万方数据
维普
