内蒙古查干淖尔湖东湖水体富营养化特征及其影响因素

Eutrophication Characteristics of the East Chagannaoer Lake in Inner Mongolia and Their Influencing Factors

为了探究内蒙古查干淖尔湖东湖水体富营养化特征及影响因素,于2011年至2021年每年的2月10日、5月10日、8月10日和10月5日,对查干淖尔湖东湖水体水质指标进行监测,采用综合营养状态指数法,对查干淖尔湖东湖水体富营养化程度进行评价,采用冗余分析法,确定影响查干淖尔湖东湖水体富营养化的主要因素。研究结果表明,2011年至2021年查干淖尔湖东湖水体整体属于中度富营养化,水体中总氮质量浓度为0.14~5.81 mg/L,总磷质量浓度为0.15~0.80 mg/L,高锰酸盐指数为6.56~39.52 mg/L,叶绿素a质量浓度为0.63~7.66 mg/L;水体富营养化程度随季节变化明显,冬季查干淖尔湖东湖水体为重度富营养,夏季和秋季水体为中度富营养,春季水体为轻度富营养;气温和湖泊水量是影响查干淖尔湖东湖水体富营养化的主要因素。

In order to study the eutrophication characteristics and influencing factors of the water of the east Chagannaoer Lake in Inner Mongolia,the water quality indexes were monitored on February 10,May 10,August 10 and October 5 every year from 2011 to 2021.The comprehensive nutrient status index and redundancy analysis methods were applied to evaluate the eutrophication state and determine the main affecting factors of the lake.The results showed that the lake was averagely at middle eutropher from 2011 to 2021.Contents of total nitrogen,total phosphorus,permanganate indexes and chlorophyll a were 0.14 mg/L to 5.81 mg/L,0.15 mg/L to 0.80 mg/L,6.56 mg/L to 39.52 mg/L and 0.63 mg/L to 7.66 mg/L respectively.However,the eutrophication status of the lake varied in different seasons.It was hyper eutropher in the winter,middle eutropher in the summer and the autumn,and light eutropher in the spring.Air temperature and lake storage were the main affecting factors of the lake’s eutrophication status.