科研之友
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摘要
The water quality evolution characteristics and its influencing factors of Poyang Lake were studied by using the WQI method based on the monitoring data of 2003-2016. The results show that the WQI value of water quality was 37.61±7.71 in average from 2003 to 2016. TN and TP has higher pollution level compared with other indexes. The changes of WQI values can be divided into two stages, a great variation period between 2003 and 2010, with the WQI (TP) values decreased from 70.7 to 65.2 whereas WQI (TN) values increased from 59.4 to 67.4. The pollution level of P was higher than N during this period of time. In addition, the WQI values were gradually stable from 2011 to 2016. However, the WQI(TN) and WQI(TP) values increased significantly, and the pollution level of N exceeded that of P in this period. Statistic analysis suggests that the increase of TN concentration was closely related to industrial and domestic wastewater discharge, and the decrease of TP was largely attributed to the enhanced P load control in the watershed from 2003 to 2010. From 2011 to 2016, the increasing of TN and TP concentrations were closely related to the rapid increasing of domestic wastewater and tourism pollution. The water quality in northern area was better than other areas. TP concentration exceeds the standard in the southwest lake area, and the TN pollution in the southeast lake area was the highest. Overall, the spatial distribution of water quality in Poyang Lake was closely related to the N and P loads from the "Five river".
