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THE IMPACTS OF RAILROAD ENGINEERING ON THE ALPINE GRASSLAND ECOSYSTEM IN THE QINGHAI-TIBET PLATEAU |
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Abstract: The distribution characteristics and regional changing background of alpine cold ecosystem along the railroad, where the permafrost was located, are analyzed. Based on the comparison of the variation laws of the ecosystem along the Qinghai-Tibet highway line and the relationship between permafrost environment and various alpine ecosystem, the integrative disturbed degree index method and its quantitative assessment model, which comprised with the factors of engineering disturbed soil environmental change, permafrost condition change and the restoration degree and anti-disturbing capacity of the various alpine cold ecosystem, are put forward and used to estimate the impacts of railroad engineering on the alpine cold ecosystem in Tibetan plateau. According to the climate change scene in future 50 years and the construction measures of the Qinghai-Tibet railroad, the impacts estimating results show that the most serious disturbing construction actions have a middle degree of influence on ...更多ecosystem with maintaining the disturbed grassland coverage over 50%. Meanwhile, the influence on alpine steppe ecosystem will be in middle and light degree. For the middle and light disturbing construction actions, there will be slight influence on alpine ecosystems.
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Received: 19 August 2009
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