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GEOGRAPHICAL RESEARCH >

2010 , Vol. 29 >Issue 8: 1439 - 1451

DOI: https://doi.org/10.11821/yj2010080009

Environment and Ecology

The characteristics of land cover and macroscopical ecology changes in the source region of three rivers on Qinghai-Tibet Plateau during last 30 years

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  • 1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2009-11-30

  Revised date: 2010-04-12

  Online published: 2010-08-25

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Abstract

Based on field investigations we obtained four phase land cover spatial data sets by interpreting MSS images of the mid- and late 1970s and three phase TM images of the late 1980s, 2004 and 2008 in the Three Rivers’ Source Regions. We defined the relation between land cover type and ecological grade, land cover change index and land cover condition index to characterize the trends of land cover and macroscopical ecological changes in this region. By calculating the direction and extent of land cover change, land cover change index and land cover condition index, we analyzed temporal and spatial characteristics of land cover change and macro ecological condition change in the source region of three rivers on the Qinghai-Tibet Plateau since the mid- and late 1970s. The results showed that the average land cover condition index of the Three Rivers’ Source Region was 38.20, being the fourth grade in the last 30 years. The Yellow River basin had the best land cover condition, followed by the Lancang River basin, and the Yangtze River basin had the worst. Land cover type with high ecological grade transforming to that with low grade was the main phenomena during the 1970s to 1990s and the 1990s to 2004. Land cover with low grade transforming to that with high grade was the main phenomena during 2004 to 2008. Indicated by land cover condition index change rate and land cover change index, land cover and macro ecological condition degenerated (7090 period Zc-0.63, LCCI -0.58)-obviously degenerated(9004 period, Zc-0.94, LCCI -1.76)-slightly meliorated(0408 period, Zc 0.06, LCCI 0.33). This course was jointly driven by climate change, grassland stocking pressure and implementation of ecological construction project.

Key words： land cover condition index; land cover condition change index; direction and extent of land cover change; source region of three rivers

Cite this article

SHAO Quan-qin, ZHAO Zhi-ping, LIU Ji-yuan, FAN Jiang-wen . The characteristics of land cover and macroscopical ecology changes in the source region of three rivers on Qinghai-Tibet Plateau during last 30 years[J]. GEOGRAPHICAL RESEARCH, 2010 , 29(8) : 1439 -1451 . DOI: 10.11821/yj2010080009

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