Abstract：Samples of eroded sediments and storm runoff water were collected from 5 headwater ditches of forestry, agricultural, residential and mixed sub-catchment in a typical catchment of upper Yangtze River, located in hilly area of purple soil, Sichuan Basin. The Olsen P and degree of phosphorus saturation (DPS) of the eroded sediments and soluble reactive P (SRP) of runoff water were determined so as to evaluate potential of P release from eroded sediments. A significant split-line relationship of runoff water SRP between Olsen P and DPS of sediment was observed, and the changing points at 32mg/kg for Olsen P and 28% for DPS, respectively, were detected as critical values for evaluation of release risk of sediment P. If higher than the critical values, the risk of P release from the sediments would be greater. The P release risks of the eroded sediments originated from different land uses varied significantly. The sediment from residential area acted as a source of runoff water SRP, whereas, the sediments from forestry land and paddy field served as a sink of water P. The sediments from dry cropland and mixed sub-catchment acted as a potential source of water P. The potential for P release from the sediment was dependent on sediment sources and their physicochemical properties.
王振华, 朱波, 李青云. 不同土地利用方式下侵蚀泥沙中磷释放风险评价[J]. 中国环境科学, 2011, 31(3): 474-480.
WANG Zhen-Hua, ZHU Bo, LI Qing-Yun. Risk assessment on phosphorus release from eroded sediments in different land uses. CHINA ENVIRONMENTAL SCIENCECE, 2011, 31(3): 474-480.
