滇池蓝藻水华时空变化特征及环境影响因素OA北大核心CSTPCD

[Objective]The objectives of this study are to clarify the evolution characteristics of eutrophication and the status of comprehensive treatment of water in Dianchi Lake as well as the main driving factors,so as to provide scientific support for water pollution control and ecological restoration in Dianchi Lake.[Methods]The Dianchi Lake was taken as the research object.GEE and remote sensing monitoring were used to analyze the spatiotemporal variation of cyanobacteria bloom in Dianchi Lake during 2002-2021 and the relationship between cyanobacteria bloom and environmental factors.[Results]The variation of cyanobacteria bloom area showed significant interannual characteristics during 2002-2021,and the peak values of cyanobacteria bloom area in 2006,2013 and 2016 were 1.952×107,2.010×107 and 1.743×107 m2,respectively.The valley values of cyanobacteria bloom area in 2005,2010 and 2014 were 1.243×107 m2,1.156×107 m2 and 1.163×107 m2,respectively.After 2016,it fluctuated steadily and had no obvious change trend on the whole.In 2021,the area was 1.709 × 107 m2.At the monthly scale,the bloom of cyanobacteria mainly occurred from July to December,and reached its peak in August.It continued to decrease from November to February,and reached its trough in February.Through statistical analysis of the characteristics of cyanobacteria bloom and environmental factors in Dianchi Lake,the results showed that the cyanobacteria bloom had a positive correlation with temperature and precipitation,a significant negative correlation with wind direction(p＜0.05),and the closest significant correlation with wind direction(p＜0.05).Among the four meteorological factors,the wind direction was the most important,and the easterly wind direction had a significant promoting effect on the coverage of cyanobacteria bloom in Dianchi Lake.[Conclusion]The overall fluctuation of cyanobacteria in Dianchi Lake remained stable without significant evolution trend,and the important driving role of wind direction and wind speed on cyanobacteria outbreak should be further considered in the future in term of water ecological restoration of Dianchi Lake.