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| The pollution risk assessment of nitrogen and phosphorus loss in surface runoff from farmland fertilizer |
| Received:June 06, 2017 |
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| KeyWord:agricultural non-point source pollution;fertilizer;nitrogen and phosphorus;environmental risk assessment |
| Author Name | Affiliation | E-mail | | SUN Cheng | Shool of Environment, Beijing Normal University, Beijing 100875, China | | | ZHOU Hua-zhen | Shool of Environment, Beijing Normal University, Beijing 100875, China | | | CHEN Lei | Shool of Environment, Beijing Normal University, Beijing 100875, China | chenlei1982bnu@bnu.edu.cn | | SHEN Zhen-yao | Shool of Environment, Beijing Normal University, Beijing 100875, China | |
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| Abstract: |
| Nitrogen and phosphorus loss in farmland fertilizer is the main cause of environmental water pollution.Using six provinces and one city in the middle and lower reaches of the Yangtze River as a study area,and by investigating on the data of fertilizer of 80 municipals,we estimated the loss of nitrogen and phosphorus in surface runoff from farmland fertilizer.Based on the combination of three factors,namely fertilizer loss,rainfall,and drainage density,we put forward a scheme to classify the pollution risk from fertilizer nitrogen and phosphorus,and identified the key areas of concern preliminarily.The results show that fertilizer application has increased during the past 20 years,and areas with high nitrogen loss and phosphorus surface runoff are concentrated in Hunan Province.The average nitrogen and phosphorus loss intensities were 2.41 and 0.61 kg·hm-2·a-1,respectively.The zone with a high risk of pollution was Hunan Province,Shanghai City was the low risk zone,and the other five provinces were dominantly middle-and low-risk areas.These results are beneficial to preventing risk from agricultural non-point source pollution and promoting the optimization of control measures in China. |
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