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| Influencing Factors and Estimation of Total Phosphorus Runoff from Farmlands in China |
| Received:August 20, 2014 |
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| KeyWord:paddy field;upland field;influencing factor;TP runoff loss;model |
| Author Name | Affiliation | E-mail | | YANG Wang-xin | College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China
Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | XIA Yong-qiu | Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | yqxia@issas.ac.cn | | JIANG Xiao-san | College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China | gis@njau.edu.cn | | YAN Xiao-yuan | Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | |
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| Abstract: |
| Phosphorus(P) losses via runoff from farmlands to water not only decrease the efficiency of fertilizer P, but may also cause water pollution. In this paper, we identified the influencing factors and estimated the amount of P runoff losses from farmlands in mainland China via statistically analyzing the recent 10 year experimental results on P runoff losses in farmlands. Total P runoff losses were negatively correlated with soil TP and clay contents, but positively with P application rates and rainfall. According to the 2012 China Statistical Yearbook and the 2012 China Meteorological Yearbook, the TP runoff losses from paddy fields and upland fields for each province were estimated, and ranged from 0.585 kg·hm-2 to 3.015 kg·hm-2 in the paddy fields and 0.045 kg·hm-2 to 0.473 kg·hm-2 in the upland fields in 2011. The corresponding total amounts of TP runoff losses were from 0.036 Tg to 0.059 Tg, with a mean value of 0.047 Tg, and from 0.009 Tg to 0.024 Tg, with an average of 0.017 Tg. Our results show that the average content of TP runoff losses would be 0.064 Tg from farmland in China in 2011. |
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