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| Spatio-temoral changes of fertilization environmental risk of China |
| Received:October 29, 2016 |
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| KeyWord:intensity of fertilization;environmental safety threshold;environmental risk index;spatio-temporal change;China |
| Author Name | Affiliation | | LIU Qin-pu | School of Environmental Science, Nanjing Xiaozhuang University, Nanjing 211171, China |
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| Abstract: |
| It is very important for non-point source pollution control to evaluate the risk of non-point source pollution from fertilization.Studies on the spatio-temporal changes of environmental risk of fertilization in China were carried out in order to fully recognize the differences in environmental risk of fertilization at national and provincial levels to accelerate eco-agriculture construction of China.Models of fertilization environmental threshold and risk assessment were established to calculate the fertilization thresholds and assess the fertilization environmental risk of China.Results showed that,the thresholds of fertilization safety were between 200~300 kg·hm-2 over past 25 years with an average of 243 kg·hm-2.The fertilization risk changed from safety to low risk degree in 1994;the risks of nitrogen,phosphorus and potash changed to low risk from safety in 1988,1999,2008,respectively;the environmental risk of fertilization has been decreasing since 2006.The environmental risk was at low degree in 2014 with averages of fertilization environmental safety thresholds and risk index of 285 kg·hm-2 and 0.54,respectively.The risk indexes of nitrogen,phosphorus and potash were 0.54,0.53,0.49,respectively.The environmental risks at provincial level showed great differences,and the types of risks were aggregately distributed in 2014.There were 11 provincial areas at environmental safety degree,16 areas at low risk degree,three areas of Henan,Hainan and Tianjin at medium risk degree,and the area of Shaanxi at serious risk degree. |
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