Study on the spatio-temporal distribution of Cladophora in the Shaliu River estuary of Qinghai Lake and its response to the lake area and meteorological elements

doi:10.13474/j.cnki.11-2246.2026.0309

Abstract

Abstract: As China's largest inland saltwater lake,the distribution of Cladophora in Qinghai Lake has shown dynamic changes in response to climate change.This study selected the estuarine area of Shaliu River in Qinghai Lake to carry out detailed research.Based on the Google Earth Engine (GEE) platform,monthly cloud-free Sentinel-2 images during the non-icing period from 2022 to 2024,as well as TerraClimate and ERA5-Land meteorological data,were acquired.For the RGB-NDWI fused images,the WEU-Net model and the CSI method were used to identify Cladophora.Additionally,the spatiotemporal distribution characteristics of Cladophora and its response relationships with lake water area and meteorological factors were analyzed.The results show that there is a significant positive correlation between the area of Cladophora and the lake area,with a Pearson correlation coefficient of 0.76.Both the area of Cladophora and the lake area increase from April to September,and then decrease after reaching the peak in September.Cladophora is mainly distributed at the edge of the lake area and in the bays,and its outer boundary is consistent with the lake boundary.There are significant positive correlations between the area of Cladophora and precipitation,air temperature,and lake mixed layer temperature,and a significant negative correlation with wind speed.The order of the correlation intensity is lake mixed layer temperature,wind speed,air temperature,precipitation.This study reveals the synergistic driving mechanism of hydrometeorological factors on the distribution of Cladophora.

Key words: Qinghai Lake, Cladophora, lake water area, meteorological elements, Sentinel-2

CLC Number:

P237

YIN Wanling, ZHANG Zhijun, ZHANG Yin, YUAN Shuai, HU Qingwu, XU Wenting, LI Zhijun. Study on the spatio-temporal distribution of Cladophora in the Shaliu River estuary of Qinghai Lake and its response to the lake area and meteorological elements[J]. Bulletin of Surveying and Mapping, 2026, 0(3): 51-56.

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