Vegetation Growth Monitoring in Jiaozhou Bay Coastal Wetland Based on Multi-Source Remote Sensing Data

Abstract

Jiaozhou Bay coastal wetland, located in the mouth of the Dagu River, is an estuary wetland. In this wetland seawater blends with freshwater. It is a rare type of national wetland, a unique ecosystem on earth. It is of great research value, but there are few articles conducting multi-indicator studies about Jiaozhou Bay coastal wetland ecosystem. This paper helps to formulate wetland conservation measures comprehensively through multi-source remote sensing monitoring. Based on NDVI, FVC, LAI, NPP and the spatial distribution changes of land use, this paper is a synthetical exploration of the vegetation growth of Jiaozhou Bay coastal wetland. The results show that: 1) From 2013 to 2019, NDVI, LAI and NPP indices rose to varying degrees in the coastal wetlands of Jiaozhou Bay. FVC showed a broad downward trend, and its indicators are declining in the north-central region; 2) The major land types are impervious surface and grassland, where the decrease proportion of grassland is the largest, and the increase proportion of impervious surface is the largest in the study area; 3) Analytical results demonstrate that the overall vegetation situation of Jiaozhou Bay coastal wetland improved on the whole, but with local deterioration. So, ecological protection measures in the study area have begun to bear fruit.