摘要
星云湖位于云南省玉溪市江川区,为云南九大高原湖泊之一,属于富营养化湖泊,由于藻类水华的发生发展变化很快,对藻类水华开展高时间频率、高空间分辨率的监测显得非常有必要。本研究基于GF-1 WFV影像,分析了2017年2月至2018年6月星云湖的藻类水华变化特征,主要研究结果表明:星云湖大部分时间都有藻类水华聚集,3至4月是藻类水华的起始和萌发时期,5至12月是蓝藻水华的大规模爆发期,到下一年1至3月是衰退期。本研究还2次观测到了水华的快速衰退,持续时间仅仅不到一个星期。此外,藻华面积与NDVI最大值和平均值有显著的正相关,污染指数与藻华面积最大时的NDVI均值呈显著的正相关。本研究为掌握星云湖藻类水华的发生发展规律,进而提高预警能力提供了一定的借鉴。
Xingyun lake is located in Jiangchuan district, Yuxi city, Yunnan province. It is one of the nine major plateau lakes in Yunnan province. It is very necessary to monitor the high time frequency and high spatial resolution of algae bloom because of the rapid development of algae bloom. Based on the GF-1 WFV image, this study analyzed the characteristics of algae bloom changes in the Xingyun lake from February 2017 to June 2018. The main results of the study showed that the Xingyun lake had algae bloom aggregation most of the time, March-April is the germination period of algal blooms, May-December is the large-scale outbreak of algae blooms, and January-March is the decline period of the following year. The study also observed two rapid declines of algae for less than a week. In addition, there was a significant positive correlation between the algal bloom area and the Maximum NDVI and the Average NDVI, and the pollution index showed a significant positive correlation with the MEAN NDVI mean when the algal bloom area was the largest. This study pro-vides some references for understanding the occurrence and development law of algae bloom in Xingyun lake and then improving the early warning ability.
基金
云南省地方本科高校(部分)基础研究联合专项项目(编号2017FH001-100,2018FH001-067,2018FD094,2017FD161)和云南省教育科学规划项目(编号GJZ171813)联合资助。
