镜泊湖水体富营养化空间分布特征与影响因素分析

Spatial distribution characteristics and impact factors of eutrophication in Jingpo lake

利用2015年9月镜泊湖实测叶绿素a浓度与同步Landsat8 OLI数据建立了叶绿素a浓度波段组合模型,根据拟合度和验证精度最优原则,确定最优反演模型为(B4+B5)/B3。通过Carlson营养状态指数法分析可知,镜泊湖水体营养化状态在空间上存在差异,其中湖区大部分地区属于中营养状态,南部地区湖心位置为贫营养状态,镜泊乡附近湖区处于富营养化状态。

Based on the chlorophyll a concentration and synchronous Landsat 8 OLI data of Jingpo lake in September2015, a combined band model of chlorophyll a concentration was established. According to the principle of goodness of fit and validation accuracy, the optimal inversion model was determined as(B4+B5)/B3. The results showed that the spatial distribution of eutrophication in Jingpo lake is different by Carlson index method. Among them, most parts of the lake area belonged to the state of medium nutrition, the south part of the lake was in the state of poor nutrition, and the lake area near Jingbo township was in the state of eutrophication.