期刊
ECOLOGICAL INDICATORS
卷 60, 期 -, 页码 483-494出版社
ELSEVIER
DOI: 10.1016/j.ecolind.2015.07.023
关键词
Non-point source pollution; Phosphorus loads; Soil erosion; Critical soil properties; Taihu Lake
资金
- National Natural Science Foundation of China [41301227]
- Research Fund of State Key Laboratory of Soil and Sustainable Agriculture, Nanjing Institute of Soil Science, Chinese Academy of Science [Y412201427]
Effectively identifying soil properties in relation to non-point source (NPS) phosphorus pollution is important for NPS pollution management. Previous studies have focused on particulate P loads in relation to agricultural non-point source pollution. In areas undergoing rapid urbanization, dissolved P loads may be important with respect to conditions of surface infiltration and rainfall runoff. The present study developed an integrated model for the analysis of both dissolved P and particulate P loads, applied to the Meiliang Bay watershed, Taihu Lake, China. The results showed that NPS P loads up to 15 kg/km(2) were present, with particulate P loads up to 13 kg/km(2). The highest loads were concentrated in the south-eastern region of the watershed. Although particle P was the main contributor to NPS P loads state, the contribution of dissolved P was significant, especially in sub-basins with significant amount of artificial land cover. The integration of dissolved P and particulate P loads provided more accurate evaluation of NPS P pollution. NPS P loads were found to correspond to specific soil properties. Soil organic matter and total nitrogen were shown to influence dissolved P loads, while total phosphorus and soil particle composition proportion were more closely related to particulate P loads. (C) 2015 Elsevier Ltd. All rights reserved.
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