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不同土地利用方式下侵蚀泥沙中磷释放风险评价
Risk assessment on phosphorus release from eroded sediments in different land uses

查看参考文献27篇

王振华 1   朱波 1   李青云 2  
文摘 采集紫色土丘陵区典型小流域不同土地利用方式(包括林地,水田,旱地,农村居民点等)下的侵蚀泥沙和降雨径流样,测定泥沙的生物有效磷(Olsen P),磷吸持饱和度(DPS)和降雨径流的溶解性活性磷(SRP).结果表明,泥沙Olsen P和DPS与降雨径流SRP平均浓度呈显著的折线关系.通过折线模型计算出侵蚀泥沙磷释放的风险阈值为Olsen P 32mg/kg和DPS28%.当泥沙Olsen P和DPS大于其阈值时,磷向水体释放的环境风险大大增加.不同土地利用方式下侵蚀泥沙中磷的释放环境风险差异显著.农村居民点沟渠泥沙的磷释放风险较大,是径流水体的磷源,林地和水田沟渠泥沙是径流水体的磷汇,旱地和综合沟渠泥沙属于潜在的磷释放源.泥沙磷的释放潜力取决于泥沙来源和泥沙理化性质
其他语种文摘 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
来源 中国环境科学 ,2011,31(3):474-480 【核心库】
关键词 土地利用 ; 泥沙 ; 磷 ; 释放阈值 ; 风险评价
地址

1. 中国科学院成都山地灾害与环境研究所, 四川, 成都, 610041  

2. 长江科学院流域水环境研究所, 湖北, 武汉, 430010

语种 中文
文献类型 研究性论文
ISSN 1000-6923
学科 环境质量评价与环境监测
基金 中国科学院知识创新工程项目 ;  国家重大科技专项
文献收藏号 CSCD:4153938

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引证文献 3 篇

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被引 8 次

2 马东 强降雨下农田径流中溶解态氮磷的输出特征——以崂山水库流域为例 中国环境科学,2012,32(7):1228-1233
被引 10 次

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