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| Spatial differences in non-point source particle phosphorus loads and critical influence factors in the Chaohu Basin |
| Received:February 03, 2018 |
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| KeyWord:land use;particulate phosphorus loading modulus;Chaohu Basin;sediment delivery distributed model |
| Author Name | Affiliation | E-mail | | WANG Zhao-fei | Key Laboratory of National Mapping Geographic Information Bureau of Watershed Ecology and Geographic Environmental Monitoring, School of Surveying and Mapping Engineering, East China University of Technology, Nanchang 330013, China
Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China | | | LIN Chen | Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China | clin@niglas.ac.cn | | XU Jin-duo | Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China | | | JIN Ping-hua | Jiangsu Institute of Land Surveying and Planning, Nanjing 210017, China | | | XIONG Jun-feng | Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | MIN Min | Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | MA Rong-hua | Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China | |
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| Abstract: |
| In this study, we selected seven sub-basins of the Chaohu Basin as the target area. Furthermore, county-level administrative division data were used to refine the units of the study area to ensure more reliable results. A sediment delivery distribution model was then established to quantitatively estimate the particulate phosphorus loading modules (PPLM) of the Chaohu Basin in 2015. Finally, multiple factors, including the geographical location, resource conditions, and socio-economic indicators, are comprehensively integrated to determine the differences in the loss of particulate phosphorus and their causes under different land use patterns. The main conclusions are as follows:The average PPLM of the entire Chaohu Basin is 0.308 t·km-2·a-1, while, among the different land-use types, the lowest level is observed in construction land (0.138 t·km-2·a-1), which is lower than that of woodland (0.759 t·km-2·a-1) and cultivated land (0.256 t·km-2·a-1). This differs from previous studies, demonstrating that subdividing the research units can improve the reliability of the results. There are spatial differences in PPLM. High-value areas are concentrated in the Hangbu River Basin (Yuexi, Huoshan, and Shucheng counties), with steep slopes and abundant rainfall, while low-value regions are distributed in the flat terrain and developed economic basins, such as the Paihe (Feixi County) and Nanfei River basins (Hefei City and Changfeng County). Steep slopes and abundant rainfall could be the main reasons for the higher PPLM in woodland and cultivated land, and the unsustainable use of chemical fertilizers, pesticides, and plastic film pollution have led to higher arable land loadings. In addition, the breeding of livestock and poultry increases the loadings of construction land, and the distribution of phosphorite also increased the background phosphorus values. |
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