Variations of Vegetation Coverage and Its Relations to Global Climate Changes on the Tibetan Plateau during 1981-2005
Recent global climate changes have an important effect on vegetation coverage on the Tibetan Plateau.Based on the remote sensing images and the meteorological data during 1981-2005,as well as the model of extracting vegetation coverage,the spatial-temporal variations of vegetation coverage and its responses to global climate changes on the Tibetan Plateau were studied.The results revealed that,under the combination effects of the temperature rising and the precipitation increasing,vegetation coverage increased as a whole from 1981 to 2005,except some degradation in small regions of the Tibetan Plateau.The degraded vegetation regions were mainly distributed in the area of higher vegetation coverage,while the improved vegetation regions were in the area of lower vegetation coverage on the Tibetan Plateau.The responses of vegetation coverage to global climate changes varied with different vegetation types.The vegetation coverage of needle-leaved forest and broad-leaved forest were decreasing due to the serious destruction of woods,while the other vegetation types were increasing.Global climate changes have contributed to an increase of vegetation coverage on the Tibetan Plateau,and the vegetation coverage changes were positively correlated with the changes of precipitation and temperature during 1981-2005.The correlation between vegetation coverage changes and precipitation and temperature variations was obviously different in different regions.
vegetation coverage, Normalized Difference Vegetation Index (NDVI)climate changesthe Tibetan Plateau
NETL
NSTL
万方数据
维普
