Water Quality Evaluation and Pollution Source Analysis of Lhalu Wetland in Xizang
Taking the Lhalu wetland and the main canals of replenishment and drainage as the research object,the water quality of 8 points in the Lhalu wetland system was monitored in the dry period and the wet season,and the wa-ter quality of the two periods was comprehensively evaluated by the single factor index method.The results showed that there were different degrees of pollution in the water system of Lhalu wetland in different seasons.During the dry season,the water quality of Lhalu wetland system was worsen into ClassⅢ,CassⅣand inferior ClassⅤ.The main pollution factors were TN,TP and NH3-N,and the maximum exceedance multiples were 11.20 times,2.67 times and 1.29 times,respectively.During the wet season,the water quality of the Lhalu wetland system was ClassⅣ,CassⅤand inferior ClassⅤ.The main pollution factors were TN,petroleum and TP,the exceedance multiples of which reached 6.90 times,2.80 times and 1.10 times,respectively.Through the analysis of pollution sources,it was deter-mined that the main source of pollution was the discharge of domestic sewage from urban residents into the upper reaches of the Lhalu Wetland.In addition,the dissolved oxygen in the water body of the Lhalu Wetland decreased se-riously during the dry season and the wet season,which was mainly caused by the consumption of aquatic animals,plants and microorganisms in the wetland.
Lhalu WetlandWater quality evaluationSingle factor index methodPollution source
NETL
NSTL
万方数据
