Abstract
Abstract. Wetland is an important land and natural resources with many functions. It is closely related to the survival, reproduction and development of human beings, as well as one of the most important living environments of human beings. Hainan Province, which is located in the northern edge of the tropics with the tropical monsoon climate and covers a variety of wetland types. In this paper, in order to investigate the change of wetland distribution and the variations of area in study region, the remote sensing data of GF-1 and GF-2 from 2009 to 2015 were used. The method used in this study was automatic information extraction and human-computer interaction. The wetland types in study area mainly was divided into three level-1 classes, including coastal wetland, river wetland and lake wetland, and was also divided into eight level-2 classes at the same time. The results showed that the total area of wetland increased 9.13 km2 in study area from 2009 to 2015, in which the area of constructed wetland increased 6.29 km2, the natural wetland increased only 2.83 km2. The area of natural wetland has not changed much, but its proportion has been reduced. This reflected that the wetland in the research area has been more artificially intervened since 2009, which caused the increasing of the area of constructed wetland. As the wetland resources can coordinate the sustainable benefit of the society, the protection of natural wetland should be strengthened and valued.
Highlights
As one of the most significant natural resource, wetland play an important role in water withdrawals, land conversion to agriculture, shoreline and waterfront development, and a key habitat within the domestic biodiversity hotspot and provide important ecosystem services for human well-being (Craft, 2016; Perennou et al, 2018)
The wetland types in study area mainly was divided into three level-1 classes, including coastal wetland, river wetland and lake wetland, and was divided into eight level-2 classes at the same time
GIS and remote sensing provides an effective method for monitoring wetland changes in area
Summary
As one of the most significant natural resource, wetland play an important role in water withdrawals, land conversion to agriculture, shoreline and waterfront development, and a key habitat within the domestic biodiversity hotspot and provide important ecosystem services for human well-being (Craft, 2016; Perennou et al, 2018). There are different rules about wetland classification in different countries The systematic classification such as the U.S fish and wildlife service system are widely used in the United States. This classification divided wetlands into 5 systems as sea, estuaries, rivers, lakes and swamps (Cowardin, L.M., et al, 1979). The wetland classification system developed by the Canada national wetland working group divided the wetlands into 5 types Such as bog, fen, swamp, marsh and shallow water (National Wetlands Working Group et al, 1997). Jiangsu province established coastal wetland classification system which divided wetland into coastal, rivers, pond, reservoir and estuary wetland (Zhu et al, 2007a). Fujian province divided their wetlands into offshore wetland, inland wetland and constructed wetland (Chen, 2007)
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