| Summary: | In order to comprehensively and accurately evaluate the adsorption effect of <i>Eichhornia crassipes</i> planting on algae in water, this study used 131 cloudless Sentinel-2 images to monitor the scale and growth dynamics of <i>Eichhornia crassipes</i> planting in Caohai and its surrounding waters. Based on the single and multi-peak histogram characteristics of the NDWI image in the study area, the empirical threshold and the optimized histogram slope adaptive threshold (OHSAT) segmentation methods were respectively used and manual inspection was added to accurately segment the water bodies and <i>Eichhornia crassipes</i>. The results of the analysis of <i>Eichhornia crassipes</i> area, growth status (NDVI), water body algae density (NDVI), and their spatial–temporal co-variation and trends show that the <i>Eichhornia crassipes</i> has a significant enrichment effect on algae, showing a significant decreasing trend of water bloom centered on it. The size and growth status of <i>Eichhornia crassipes</i> are inversely proportional to the water body NDVI, and reasonable harvesting plans based on these findings are expected to achieve optimized pollution control effects.
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