Study on the Change of Landscape Patterns of Wetlands in the Middle Reaches of the Huaihe River Basin Based on the Secondary Wetlands Classification

This article adopted the model of transformation probability matrix to analyze the change of wetland landscape in the middle reaches of the Huaihe River basin based on the secondary wetlands classification.We mainly analyzed the transformation course between dry land,residential land,and forest land to all kinds of wetlands,also between all kinds of wetlands each other from 1950s to 1980.Results showed that wetlands shrinked in the area,although the reduction of wetlands area was small,internal structural changed significantly.The main changes of the wetland landscape patterns in the middle reaches of the basin are: a great deal of wetlands transformed to paddy field and non-wetland,and some transformed to constructed wetland.River and lake reduced mostly and there was the changing process of river and lake to floodland to non-wetland.