Detection of sensitive soil properties related to non-point phosphorus pollution by integrated models of SEDD and PLOAD |
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Institution: | 1. Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, Hunan 410125, China;2. Huanjiang Observation and Research Station for Karst Ecosystems, Chinese Academy of Sciences, Huanjiang, Guangxi 547100, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;4. Southwest Watershed Research Center, USDA-ARS, Tucson 85719, USA;5. Key Laboratory of Mountain Environment Evolvement and Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Sichuan 610041, China;1. Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China;2. China Institute of Water Resources and Hydropower Research, Beijing 100048, China |
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Abstract: | 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/km2 were present, with particulate P loads up to 13 kg/km2. The highest loads were concentrated in the southeastern 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. |
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Keywords: | Non-point source pollution Phosphorus loads Soil erosion Critical soil properties Taihu Lake |
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