基于Landsat影像的长寿湖水体营养状态时空变化遥感研究  

Trophic status mapping for Changshou Lake from time series landsat images

作　　者：张辰[1] 夏婧 闵天 梁思 田婧怡 ZHANG Chen;XIA Jing;MIN Tian;LIANG Si;TIAN Jingyi(State Key Laboratory of Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan 430079,China;Changjiang Spatial Information Technology Engineering Co.Ltd,Wuhan 430010,China;Hubei Institute of Photogrammetry and Remote Sensing,Wuhan,430074,China)

机构地区：[1]武汉大学测绘遥感信息工程国家重点实验室,武汉430079 [2]长江空间信息技术工程有限公司(武汉),武汉430010 [3]湖北省航测遥感院,武汉430074

出　　处：《华中师范大学学报(自然科学版)》2025年第1期135-144,共10页Journal of Central China Normal University:Natural Sciences

基　　金：国家自然科学基金项目(42071325);湖北省重点研发计划项目(2021BCA220);武汉大学测绘遥感信息工程国家重点实验室专项科研经费;武汉大学“985计划”;国家重点实验室装备专项基金项目(2023)

摘　　要：湖泊的营养状态和变化趋势研究对科学认知湖泊水质演变规律和治理湖泊生态环境具有重要意义.水体颜色指数(FUI)与湖泊的营养程度密切相关,是评估湖泊营养状态及其变化规律的有效指标.本研究以重庆市长寿湖为研究区,利用1986-2022年间的Landsat5/7/8系列遥感数据,计算水体的FUI指数,由此评价水体营养状态,并结合变异系数、Sen斜率及Mann-Kendall(M-K)参数检验变化趋势分析法,探讨长寿湖及其不同功能分区近40年间水体营养状态的时空变化.结果表明:1)长寿湖水体多年来主要处于中营养状态,2002年后水质持续稳定好转;富营养水域主要集中于西部生态养殖区;2)西部生态养殖区FUI值变异系数最大(0.17),自2002年后营养状态趋于稳定改善,水质明显好转的区域多分布于湖区的中部和西北部;3)中部生态旅游区FUI值变异系数最低(0.10),营养状态多年较为稳定,水质好转和恶化的区域共存,其湖区中西部FUI值呈显著下降趋势,富营养化等级明显降低;4)东部湿地保护区的营养状态以中营养向富营养转变为主,水体富营养化风险加剧.研究结果为长寿湖水环境监测与评价提供了重要参考.Investigating the trophic status and changing trends of lakes is of great importance for understanding the evolution of lake water quality and managing lake ecosystems.The Forel-Ule Index(FUI),an index of water color,is closely related to the trophic level of lakes and can be used to evaluate the trophic status and analyze its changing patterns.This study focused on Changshou Lake in Chongqing,using a series of Landsat 5/7/8 remote sensing data from 1986 to 2022 to calculate the FUI index,thereby assessing the lake's trophic status.Spatial and temporal changes in trophic levels over the past 40 years were analyzed using the coefficient of variation(CV),Sen's slope estimator,and the Mann-Kendall(M-K)test for the whole lake and its functional zones.Results are shown as follows.1)The trophic state of Changshou Lake has primarily been mesotrophic over the years,with significant improvements in water quality since 2002;the water quality in the western ecological aquaculture zone was the poorest.2)The western ecological aquaculture zone showed the highest FUI CV of 0.17,with stable increase in trophic conditions after 2002,and the areas with notable water quality improvement were mainly distributed in the central and northwestern parts.3)The central ecotourism zone had the lowest FUI CV at 0.10,indicating relatively stable trophic conditions over the years.The middle-western area in this zone showed a strong decreasing trend in FUI values with a significant reduction in eutrophication levels.4)The eastern wetland protection zone exhibited a shift from mesotrophic to eutrophic conditions,with an increasing risk of eutrophication.These results play a crucial role in monitoring and assessing the water environment in Changshou Lake.

关 键 词：水体颜色指数 富营养化 遥感提取 Landsat影像 长寿湖 

分 类 号：P237[天文地球—摄影测量与遥感] TP79[天文地球—测绘科学与技术]