JOURNAL OF NATURAL RESOURCES ›› 2013, Vol. 28 ›› Issue (12): 2068-2080.doi: 10.11849/zrzyxb.2013.12.005

• Resources Ecology • Previous Articles     Next Articles

Changes in Dongting Lake Wetland Landscape Pattern Related to Pre- and Post-Construction of the Three Gorges Dam

YANG Li1,2, XIE Bing-geng2, QIN Jian-xin2, ZHANG Meng2   

  1. 1. College of Tourism, Hunan Normal University, Changsha 410081, China;
    2. College of Resource and Environmental, Hunan Normal University, Changsha 410081, China
  • Received:2013-01-27 Revised:2013-07-27 Online:2013-12-20 Published:2013-12-19
  • Contact: 谢炳庚,教授。

Abstract: Taking six periods of TM images of Dongting Lake area in 1987, 1993, 1998, 2003, 2004 and 2008 as data source, with the aid of geographic information system software and the landscape pattern software, extraction data on Dongting Lake wetland landscape pattern, using landscape pattern indices and the transfer matrix model methods, this paper focuses on the analysis of the pre- and post-construction of the Three Gorges project and its operation, dynamic change characteristics of landscape pattern in the Dongting Lake wetland, and the main influence on the evolution of the Dongting Lake wetland. The results show that: 1) The whole landscape fragmentation degree increases, the landscape heterogeneity decreases, and landscape shape tends to be complicated. 2) The fragmentation degree of water body increased, and the combination degree between patches reduced; the sediment beach fragmentation degree increased first and then reduced, the biggest patch area increased; the broken degree of moss grass and reeds has gone through an increase, decrease and increase process; the broken degree of protection forest beach experienced a reduction to increase to increase again process; the broken degree of cultivated land (paddy field and dry land) is increasing gradually, the patches of construction land increased the most; the structure of forest land is relatively stable. 3) Change in water and sediment and sediment deposition of the Dongting Lake wetland has taken place under the operation of the Three Gorges project, leading to a positive succession of wetland and a reduction of natural wetland area.

Key words: wetland landscape, Dongting Lake wetland, landscape pattern index, the Three Gorges project

CLC Number: 

  • Q149