Acta Geographica Sinica ›› 2006, Vol. 61 ›› Issue (1): 26-34.doi: 10.11821/xb200601003

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Mangrove Wetland Changes in the Pearl River Estuary Using Remote Sensing

LI Xia1,3, LIU Kai2,3, WANG Shugong4   

  1. 1. School of Geography and Planning, Sun Yat-sen University, Guangzhou 510275, China;
    2. Guangzhou Institute of Geochemistry, CAS, Guangzhou 510640, China;
    3. Guangzhou Institute of Geography, Guangzhou 510070, China;
    4. Institute of Environmental Science, Sun Yat-sen University, Guangzhou 510275, China
  • Received:2005-04-10 Revised:2005-08-02 Online:2006-01-25 Published:2006-01-25
  • Supported by:

    Natural Science Foundation of Guangdong, No. 031647; National Outstanding Youth Foundation of NSF of China, No.40525002; 985 Project of GIS and Remote Sensing for Geosciences from the Ministry of Education of China

Abstract:

Guangdong in South China has the largest area of mangrove wetlands in China. Mangrove forests have important ecological functions in protecting the environment. However, the mangrove wetlands have been largely lost because of intensified human activities in the study area. Remote sensing can be conveniently used to inventory mangrove forests because field investigation is very difficult. In this study, a knowledge-based system is developed to retrieve spatio-temporal dynamics of mangrove wetlands using multi-temporal remote sensing data. Radar remote sensing data are also used to provide complementary information for the quantitative analysis of mangrove wetlands. Radar remote sensing is able to penetrate mangrove forests and obtain the trunk information about mangrove structures. The integration of radar remote sensing with optical remote sensing can significantly improve the accuracies of classifying mangrove wetland types and estimating wetland biomass.

Key words: Pearl River Estuary, mangrove, wetlands, radar remote sensing, monitoring, classification