Spatiotemporal dynamics of coastal mangroves in Shenzhen （1986-2021）
WANG Denghui1, FU Junjie1, FENG Lian2
1.School of Environmental Science and Engineering， Southern University of Science and Technology， Shenzhen 518055， China 2.State Key Laboratory of Information Engineering in Surveying， Mapping and Remote Sensing， Wuhan 430079， China
Abstract：Mangroves are typical “blue carbon” ecosystems， playing vital roles in carbon sequestration， shoreline protection， and biodiversity maintenance. However， rapid urbanization has led to coastline development and land-use change， posing risks of habitat degradation. As a pioneer city of China’s reform and opening-up， the evolution of coastal mangroves in Shenzhen reflects the typical interactions between urbanization and ecosystems， and provides valuable insights for local conservation and restoration policies. Nevertheless， existing studies have mostly focused on the Shenzhen Bay mangroves， with a lack of long-term monitoring at the city scale. Based on Landsat imagery from 1986 to 2021， this study employed K-means clustering and random forest classification to systematically map and quantify the spatiotemporal patterns and aboveground biomass dynamics of mangroves along the Shenzhen coast. Results show that from 1986 to 2021， mangrove area increased from approximately 51.53 ha to 203.87 ha， while total aboveground biomass rose from 15，827.28 t to 56，674.79 t， indicating a consistent growth trend. Spatially， mangroves were mainly distributed in Shenzhen Bay， Qianhai Bay， the Maozhou River estuary， and Dongyong， showing typical estuarine and bay-area clustering characteristics. This study systematically reveals the long-term spatiotemporal dynamics of mangroves in Shenzhen， and provides data support for restoration potential assessment， differentiated conservation strategies， and carbon sink research.
2025, Vol. 59 
