Mapping global lake aquatic vegetation dynamics using 10-m resolution satellite observations  

全球湖泊水生植被高分辨率遥感制图研究

作　　者：Xuejiao Hou Jinying Liu Huabing Huang Yunlin Zhang Chong Liu Peng Gong 侯雪姣;刘金英;黄华兵;张运林;刘冲;宫鹏

机构地区：[1]International Research Center of Big Data for Sustainable Development Goals,Beijing 100094,China [2]School of Geospatial Engineering and Science,Sun Yat-sen University,Guangzhou 510275,China [3]Key Laboratory of Comprehensive Observation of Polar Environment(Sun Yat-sen University),Ministry of Education,Zhuhai 519082,China [4]Taihu Laboratory for Lake Ecosystem Research,State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China [5]University of Chinese Academy of Sciences,Beijing 100049,China [6]University of Chinese Academy of Sciences,Nanjing,Nanjing 211135,China [7]Department of Geography,and Department of Earth Sciences,The University of Hong Kong,Hong Kong 999077,China

出　　处：《Science Bulletin》2024年第19期3115-3126,共12页科学通报（英文版）

基　　金：supported by the Open Research Program of the International Research Center of Big Data for Sustainable Development Goals(CBAS2022ORP04);the National Natural Science Foundation of China(42301392);the Fundamental Research Funds for the Central Universities,Sun Yat-sen University(23qnpy08)。

摘　　要：Aquatic vegetation is crucial for improving water quality,supporting fisheries and preserving biodiversity in lakes.Monitoring the spatiotemporal dynamics of aquatic vegetation is indispensable for the assessment and protection of lake ecosystems.Nevertheless,a comprehensive global assessment of lacustrine aquatic vegetation is lacking.This study introduces an automatic identification algorithm(with a total accuracy of 94.4%)for Sentinel-2 MSI,enabling the first-ever global mapping of aquatic vegetation distribution in 1.4 million lakes using 14.8 million images from 2019 to 2022.Results show that aquatic vegetation occurred in 81,116 lakes across six continents over the past four years,covering a cumulative maximum aquatic vegetation area(MVA)of 16,111.8 km^(2).The global median aquatic vegetation occurrence(VO,in%)is 3.0%,with notable higher values observed in South America(7.4%)and Africa(4.1%)compared with Asia(2.7%)and North America(2.4%).High VO is also observed in lakes near major rivers such as the Yangtze,Ob,and ParanáRivers.Integrating historical data with our calculated MVA,the aquatic vegetation changes in 170 lakes worldwide were analyzed.It shows that 72.4%(123/170)of lakes experienced a decline in aquatic vegetation from the early 1980s to 2022,encompassing both submerged and overall aquatic vegetation.The most substantial decrease is observed in Asia and Africa.Our findings suggest that,beyond lake algal blooms and temperature,the physical characteristics of the lakes and their surrounding environments could also influence aquatic vegetation distribution.Our research provides valuable information for the conservation and restoration of lacustrine aquatic vegetation.

关 键 词：LAKES Aquatic vegetation identification Sentinel-2 MSI Vegetation occurrence Remote sensing 

分 类 号：X87[环境科学与工程—环境工程] X835[天文地球—地图制图学与地理信息工程] P283.8[天文地球—测绘科学与技术]