Remote sensing monitoring of mangrove wetland changes combined with tidal level correction in the Leizhou Peninsula
Mangrove wetlands provide important ecological support for ecological security,social and economic growth.In this paper,we discuss the temporal and spatial changes of mangrove wetlands in the Leizhou Peninsula during 1995-2020 by decision tree classification combined with the tidal pattern in different regions,based on Landsat Thematic Mapper(TM)and Operational Land Imager(OLI)sensing images.Improving the precision of mangrove information extraction is combined with artificial correction.Using high-resolution Google Earth remote sensing data,the classification accuracies in 1995,2005,2015,and 2020 were 99.79％,98.95％,99.45％,and 99.15％,and the corresponding Kappa coefficient of those years were 0.9913,0.9642,0.9624,and 0.9766.Over the past 25 years,mangrove wetland areas show a trend of early decrease followed by subsequent increase.The results were summarized as follows:(1)the Leizhou Peninsula's mangrove wetlands are concentrated in wave sheltering bay or estuary,such as the Yingluo Port,Anpu Port,Qishui Port,Haikang Port,Wushi Port,Liusha Port,Wailuo Port,Leizhou Bay,Tongming Sea and Zhanjiang Bay,where silt deposits and tidal flats distribute widely.Lack of the above conditions,there is none of mangrove distribution in the seaboard of the Hai'an town of Xuwen county to the Jinhe town and east of the Wuyang town of Wuchuan county;(2)mangrove uniformly distributes all cities and counties of the Leizhou Peninsula.In early years,the Mazhang town has the largest mangrove,followed by Leizhou and Lianjiang,and Chikan has the least mangrove.Currently,Lianjiang has the largest proportion of mangrove forests;(3)the decreasing mangrove area is more than the increasing mangrove area,and half of area is lost in the Mazhang town;(4)the conversion of mangrove forest and non-mangrove mutual landscape occurrs to water,beach and mariculture.The monitoring analysis of regional mangrove forest provides a basis for the protection of mangrove wetland and the sustainable development of ecological resources.
mangrovetidal rhythmdecision tree classificationLandsatLeizhou Peninsula
万方数据
维普
