MODIS-based monitoring of spatial distribution of trophic status in 144 key lakes and reservoirs of China in summer of 2018

Abstract

随着经济社会的快速发展和进步，我国湖库水体富营养化情况越来越严重.卫星遥感在水体营养状态监测方面具有重要潜力，但基于卫星遥感的全国范围内湖库水体营养状态监测和分析方面还鲜有研究.本文基于2018夏季的MODIS卫星遥感数据生产FUI指数产品，构建基于FUI水色指数的湖库营养状态评价方法，监测全国范围内144个重点湖库水体的营养状态等级.结果表明：贫营养、中营养、富营养的湖库比例分别为16%、24%、60%；营养状态在空间上分布不均匀，总体上呈现东高西低的现象；东北山地与平原和东部平原湖区以富营养状态水体为主；西部湖库水体以贫到中营养状态为主，尤其是青藏高原湖区贫营养比例比较高；海拔和地表温度等自然因素与工业点源和农业面源污染等人为因素是湖库营养状态的重要影响因素.;With the rapid development of the economy and society, the eutrophication of lakes and reservoirs in China is becoming increasingly serious. Satellite remote sensing has a great potential in the monitoring of water nutrient status, but little research exists on the monitoring and analysis of the water trophic status of lakes and reservoirs on a nationwide scale based on satellite remote sensing. In this study, MODIS data from summer 2018 was used to produce FUI index products, construction of evaluation method of lake and reservoir nutrition state based on FUI water color index and monitored the trophic status of 144 key lakes and reservoirs in China. The results show that the proportion of oligotrophic, mesotrophic, and eutrophic lakes and reservoirs is 16%, 24%, and 60%, respectively. The proportion of eutrophication is very high; the spatial distribution of trophic status is uneven, and the overall eutrophication is higher in the east than the west. Most reservoirs and lakes in the northeast and the east are eutrophic. The water bodies of western lakes are mostly oligotrophic to mesotrophic, an especially high percentage of oligotrophic in the Qinghai Tibet Plateau. Natural factors such as altitude and surface temperature, industrial point source, and agricultural non-point source pollution are important factors influencing the trophic state of lakes and reservoirs.