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| Analysis of nitrogen and phosphorus pollution loads from agricultural non-point sources in the Three Gorges Reservoir of Hubei Province from 1991 to 2014 |
| Received:April 25, 2017 Revised:September 27, 2017 |
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| KeyWord:agricultural non-point source pollution;export coefficient model;loss coefficient;TN;TP;spatial and temporal distribution |
| Author Name | Affiliation | E-mail | | WANG Meng | Beijing Collaborative Innovation Center for Eco-environmental Improvement with Forestry and Fruit Trees, Beijing University of Agriculture, Beijing 102206, China | | | WANG Jing-xian | Beijing Collaborative Innovation Center for Eco-environmental Improvement with Forestry and Fruit Trees, Beijing University of Agriculture, Beijing 102206, China | 18611384068@163.com | | LIU Yun | Beijing Collaborative Innovation Center for Eco-environmental Improvement with Forestry and Fruit Trees, Beijing University of Agriculture, Beijing 102206, China | housqly@126.com | | LI Chun-lei | Institute of Forest Ecological Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China | | | XIAO Wen-fa | Institute of Forest Ecological Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China | |
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| Abstract: |
| To study the temporal and spatial distribution characteristics of nitrogen and phosphorus pollution loads from agricultural non-point sources and analyze the main agricultural pollution sources and key control regions in the Three Gorges Reservoir Area(TGRA) of Hubei Province, the improved export coefficient model combined with the loss coefficient method was applied. This was based on agricultural data from 1991 to 2014 to estimate total nitrogen(TN) and total phosphorus(TP) pollution loads and emission intensities from different sources(rural life, livestock breeding, and planting) and different districts(Yiling, Zigui, Xingshan, and Badong). Spatial and temporal distribution characteristics were analyzed at the same time. The results showed that from 1991 to 2014, the annual average TN pollution load was 2 132.10 t·a-1, the annual average TP pollution load was 222.64 t·a-1, and the annual average TN emission intensities was 1.85 kg·hm-2·a-1, the annual average TP emission intensities was 0.19 kg·hm-2·a-1. Before 2006, TN and TP pollution loads reduced year by year, and then slowly increased. Compared with 1991, the annual TN pollution loads in 2014 decreased by 4.22% and the annual TP pollution loads increased by 12.30%. Dry land and rural population were the main sources of TN pollution loads, while dry land and pig raising were the main sources of TP pollution loads. Badong was the major source of TN and TP pollution loads spatially, followed by Yiling. Based on the spatial distribution of emission intensity, Badong had the highest emission intensity, followed by Zigui. The study found that farmland planting and livestock breeding were the main sources of TN and TP pollution loads, Badong was the key control region of agricultural non-point source pollution, and prevention and control efforts for agricultural non-point source pollution at TGRA of Hubei Province are still required. |
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