Dynamic processes of two-way succession of natural and man-made wetlands in Sanjiang Plain
ZHANG Su-mei1,2, WANG Zong-ming1, ZHANG Bai1, SONG Kai-shan1, LIU Dian-wei1, ZHANG Shu-qing1, LI Fang1, REN Chun-ying1, HUANG Ni1,2, ZHANG Chun-hua1，2
1. Institute of Northeast Geography and Agricultural Ecology, Changchun 130012, China; 2. Graduate University of Chinese Academy of Science, Beijing 100039, China
Based on remote sensing and GIS technology,the authors analyzed two-way succession processes of natural and man-made wetlands and impacts of natural environmental features on the processes in Sanjiang Plain during 1986-2005.Results showed that two-way succession processes of wetland in Sanjiang Plain were characterized with mutual transformation between marsh and paddy field from 1986 to 2005.During the periods of 1986-1995,1995-2000 and 2000-2005,ratios of transformation area from marsh to paddy field to total area of transformed marsh were 7.61%,37.99% and 28.81%,respectively,while ratios of transformation area from paddy field to marsh to total area of transformed paddy field were 4.83%,13.69% and 4.84% respectively.Main natural environmental features in relation to two-way succession between marsh and paddy field in Sanjiang Plain were characterized by being the regions of meadow soil and marsh soil,elevation of 0-100 m,slope gradient of 0-1°,physiognomies of low flood plain,high flood plain,depression and first terrace.
