|
| Analysis of temporal and spatial variation characteristics of phosphorus in Erhai Lake basin from 1998 to 2016 based on export coefficient model |
| Received:April 10, 2019 |
| View Full Text View/Add Comment Download reader |
| KeyWord:Erhai Lake basin;point source pollution;nonpoint source pollution;export coefficient model;sub-basin |
| Author Name | Affiliation | E-mail | | WEI Xiao-xue | Wetlands College, Southwest Forestry University, Kunming 650224, China
National Plateau Wetlands Research Center, Southwest Forestry University, Kunming 650224, China | | | LI Xiao-lin | College of Ecology and Environment, Southwest Forestry University, Kunming 650224, China | | | ZHENG Yi | College of Ecology and Environment, Southwest Forestry University, Kunming 650224, China | zhengyi-64@163.com |
|
| Hits: 3393 |
| Download times: 2591 |
| Abstract: |
| In order to analyze the temporal and spatial variations of phosphorus in Erhai Lake basin from 1998 to 2016, the phosphorus pollution load in Erhai Lake in 1998, 2005, 2010, and 2016 was calculated by output coefficient model. The results show that from 1998 to 2016, the total phosphorus pollution load in Erhai Lake had an upward trend, in which the point source pollution in the basin increased while the nonpoint source pollution decreased. However, nonpoint source pollution is still the main source of pollution. The total phosphorus pollution load in Erhai Lake basin was 390.273 t in 1998, 402.150 t in 2005, and 398.879 t in 2010; the highest value was 429.451 t in 2016. Agricultural nonpoint sources, livestock and poultry manure, and domestic sewage of urban residents were the three major sources of pollution in Erhai Lake basin, accounting for an average of 48%, 18%, and 15% of the total phosphorus pollution load, respectively. The total phosphorus pollution load in Eryuan County is 205.608 t, which is larger than that in Dali City. The unit area load of total phosphorus in the sub-basin of Erhai Lake is 86.027~540.519 kg·km-2·a-1, and the sub-basin 1~14 changes significantly. In future lake basin treatment, the discharge of phosphorus into water can be reduced by improving the efficiency of sewage treatment, realizing the scientific return of livestock and poultry manure to the field, and the rational application of chemical fertilizers to realize the reasonable circulation of phosphorus in the basin. |
|
|
|
