Study on the Dynamic Monitoring and Succession Analysis of Wetland Types in Dongting Lake Area
In this paper, three period times (1987, 1996, 2004) of Landsat TM remote sensing images data are chosen to monitor the main wetland types changes in Dongting Lake area. According to the main wetland types distribute in Dongting Lake area, a classification system of wetland types is build at first. Then the software of Erdas Images and Fragstats are used to process remote sensing images and statistical analysis. After comparison of landuse types, landscape pattern indices and transfer matrixes among three period times, the result is that the area of the wetland types decreased heavily, especially mudflat and paddy field from 1987 to 1996 because of the history “reclaiming the land from the lake, but some wetland types change and trend presented a turning point around 1996, which effected by the national policy of “returning farmland to lake launched in 1998. From 1987 to 1996, the main succession of wetland in Dongting Lake was lake water→ mudflat→ sedge land→ reed flat→forest. However, from 1996 to 2004, the natural wetland types presented the change in jumps from other various wetland types directly to forest land. The major factors influencing the wetland changes in Dongting Lake are human activities, sediment accumulation and local policies etc. Among them, the implementation of “returning land to the lake has relieved the shrink of lake and promotes the renewal of natural wetland to a certain extent.
Dongting Lake Wetland Remote sensing monitoring Returning Farmland to Lake
Zhang Huaiqing Zhu Xiaorong
Research Institute of Resource Information Techniques Chinese Academy of Forestry (CAF) Beijing, China
国际会议
北京
英文
1549-1553
2009-08-08（万方平台首次上网日期，不代表论文的发表时间）