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Journal of Geo-information Science >

2011 , Vol. 13 >Issue 5: 594 - 600,610

DOI: https://doi.org/10.3724/SP.J.1047.2011.00594

ARTICLES

Distribution and Potential Degradation Risk Evaluation of Marsh Wetland in the Mt. Qomolangma National Nature Reserve

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  • 1. Sichuan Spatial Information Industry Development Co. Ltd, Chengdu 610041, China;
    2. Tibet Autonomous Region Science & Information Technology Institute, Lhasa 850001, China;
    3. College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China;
    4. Key Lab. of Geo-detection & Information Techniques of Ministry of Education, Chengdu University of Technology, Chengdu 610059, China

Received date: 2011-03-09

  Revised date: 2011-09-21

  Online published: 2011-10-25

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Abstract

The Mt. Qomolangma National Nature Reserve was established on 18 March, 1989. In March 2005, it was listed in the global biosphere protected area network, for the marsh wetland there is very important to the environment of this region. In this paper, we took the Mt. Qomolangma National Nature Reserve as the study area, selected all 23 MODIS NDVI images of 2009, used the HANTS algorithm based on Fourier transform to remove the interference of the cloud and reconstruct NDVI time series images. The spectral angle mapper (SAM) was used to extract marsh wetland of the study area according to the different phenological characters between marsh wetland and other surface features. The area of marsh wetland is 2481.13km2, which account for 6.88% of the total study area. Its distribution in Tingri County was the most abundant, which account for 36.85% of the total marsh wetland area|followed by Dingjie, Nyalam and Gyirong counties, the proportions are 25.79%, 24.5% and 12.86% respectively. According to the characteristics of the study area, we evaluated the potential degradation risk of marsh wetland in the study area by selecting annual mean temperature linear trend as natural risk factor, influences of settlements and roads as artificial risk factors which are based on distance decay theory. This paper divided general risk assessed results mainly into five grades, that is, the lowest risk, lower risk, moderate risk, higher risk, and the highest risk. The proportions of the total marsh wetland area in the study area are 7.39%, 13.61%, 24.72%, 31.43% and 22.84% respectively.

Key words： The Mt. Qomolangma Nature Reserve; marsh wetland; spectral angle mapper; distance decay; potential degradation risk evaluation

Cite this article

MA Fei, KAN Aike, LI Jingji, GUAN Lei, CHEN Xiaoqin . Distribution and Potential Degradation Risk Evaluation of Marsh Wetland in the Mt. Qomolangma National Nature Reserve[J]. Journal of Geo-information Science, 2011 , 13(5) : 594 -600,610 . DOI: 10.3724/SP.J.1047.2011.00594

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