Spatial variation characteristics of water quality and analysis of pollution sources in Bosten Lake based on multivariate statistical analysis

HU Congqiao; DILINUER·Aji

doi:10.13984/j.cnki.cn37-1141.2025.05.023

Abstract：Correctly identifying the spatial variation characteristics of lake water quality and analyzing the pollution sources are the basis for scientific and efficient comprehensive lake management,monito-ring and management.Based on the multivariate statistical analysis method,the spatial variation char-acteristics of water quality in Bosten Lake were explored and the main pollution sources of the lake were analyzed.The results showed that the chemical oxygen demand and suspended solids in Bosten Lake were highly variable(coefficient of variation＞1),indicating that the two indicators were uneven in spa-tial distribution and highly sensitive in characterizing the spatial variation of water quality in the lake.The other water quality indicators were of medium variability(0.1＜coefficient of variation＜1).The sampling points were divided into two groups by Q-type cluster analysis:the sampling points of group I basically covering the large lakes(except sampling point N19)and the southern part of the small lakes,and the sampling points of group Ⅱ mainly located in the northern part of the small lakes.Dur-ing the study period,group Ⅰ was class Ⅲ water and met the objectives of class Ⅱ water function zone,and group Ⅱ was class Ⅳ water,which was inferior to the objectives of water function zone.The water quality in the great lakes region and the southern part of the small lakes region was relatively good,while the water pollution in the northern part of the small lakes region was relatively serious,mainly organic pollution,nitrogen and phosphorus nutrient salt pollution and physical pollution.The sources of pollutants were urban domestic sewage,farmland drainage and industrial wastewater.This study can provide reasonable guidance for the prevention and control of targeted pollution in Bosten Lake.