JOURNAL OF NATURAL RESOURCES ›› 2015, Vol. 30 ›› Issue (2): 235-247.doi: 10.11849/zrzyxb.2015.02.007

• Resource Evaluation • Previous Articles     Next Articles

Geo-Spectrum Based Analysis of Crop and Forest Land Use Change in the Recent 20 Years in the Three Gorges Reservoir Area

WANG Jin-liang1, SHAO Jing-an1,2, LI Yang-bing1   

  1. 1. College of Geographical Science, Chongqing Normal University, Chongqing 400047, China;
    2. Institute of Mountainous Ecology and Regional Development in the Three Gorges Reservoir Area, Chongqing Normal University, Chongqing 400047, China
  • Received:2013-09-10 Revised:2014-05-22 Online:2015-02-20 Published:2015-02-10
  • About author:10.11849/zrzyxb.2015.02.007

Abstract:

The Geo-spectrum unit of land use change can unify "the map expressing the spatial cells" and "the spectrum expressing the starting point and the process of phenomena" , and can establish the integrated space-property-process information. Supported by 3S technology, this paper built Geo-spectrum information of crop and forest land use change in the Three Gorges Reservoir Area at two stages (1990-2000, 2000-2010) based on TM/ETM images and auxiliary image interpretation, and also built Geo-spectrum of crop and forest land use change model which combined land use information of three periods (1990, 2000, 2010). Then the change trajectories, characteristics and laws of crop and forest land use in the Three Gorges Reservoir Ar-ea are discussed. The results showed that: 1) The interchange among crop land, forest land, and grass land, the crop land and forest land occupied by building land were the main ways of cropforest land use conversion throughout the 1990-2000 phases in the Three Gorges Reservoir Area. The change of crop land to building land (code 15)" , "grassland to forest land (code 32)" and "forest land to grassland (code 23)" were the most marked types in spatial differences, and the spatial isolation of them were low. 2) The isolation of Geo-spectrum unit of crop and forest land use change increased during 2000-2010, and the spatial scale of Geo-spectrum unit of crop and forest land use change further enlarged during 2000-2010. The most marked types were the change of "crop land to forest land (code 12)" and "crop land to building land (code 15)" . The second marked types were that of crop and forest land use flooded by water body (code 14 and 24). The area of this type enlarged. 3) The change in earlier stage and later stage were the main ways of crop and forest land use change in the Three Gorges Reservoir Area, so the transformation of crop and forest land use have obvious characteristics of stages.

Key words: Geo-spectrum characteristics, spatial isolation, crop and forest land, the Three Gorges Reservoir Area

CLC Number: 

  • F301.24