The area change and succession of Dongtinghu wetland
洞庭湖湿地的面积变化与演替

Dongtinghu wetland is a great inner land freshwater wetland connecting with the Changjiang river. It has complex and various functions and values. This paper researchs the area change and succession rules of Dongtinghu wetland after 1949. The research is important for to protection, exploitation and utilizatiion of Dongtinghu Wetland, Major contents include: (1) To get the areas of different types of Dongtinghu wetland in different years and seasons by applying remote sensing and GIS technolgy. (2) To analyse seasonal and annual change of Dongtinghu wetland and succession rules of the wetland in recent years, based on classification results of multi phase satellite images combined with manifold literature information. The area of Dongtinghu wetland changes obviously between seasons and years. The annual change includes the change of the whole area of the wetland and the area of each wetland type. The area change and succession of different part of Dongtinghu wetland is different. (3) To analyse some major factors influencing the area change and succession of the wetland. These factors include two aspects: natural factors (hydrology, mud sand deposition, etc.) and human factors (embankment, reclamation, etc.). The dominant factors are human factors after 1949.