Research on the temporal and spatial changes of vegetation coverage in Qinling mountains based on Google Earth Engine platform

doi:10.13474/j.cnki.11-2246.2022.0140

Abstract

Abstract: The dynamic change of vegetation cover in Qinling mountains has an important impact on its ecological environment. Based on the Google Earth Engine cloud platform, this paper selects the Landsat TM/OLI surface reflectance data from 1986 to 2019, combines with the dimidiate pixel model to estimate the fractional vegetation cover (FVC) in Qinling mountains. The spatiotemporal variation, stability and persistence of FVC are analyzed by using the slope of interannual variation, coefficient of variation and Hurst index. In addition, the coupling relationship between FVC and temperature and rainfall is explored,and the impact of land use change on FVC is analyzed. The results shows that:during the 34 years, FVC in Qinling region is in a good condition, with 73.11% vegetation coverage of medium, high and above; FVC will increase from 62.86% in 1986 to 70.01% in 2019, and vegetation activity will continue to increase; the mean coefficient of variation of FVC is 0.34, the standard deviation is 0.45, and its stability is highly autocorrelated with its spatial distribution; vegetation cover change in Qinling mountains is affected by climate change and human factors.

Key words: GEE cloud platform, Qinling mountains, fractional vegetation cover, temporal and spatial changes

CLC Number:

P237

ZHAO Kan, SHI Yun, NIU Minjie. Research on the temporal and spatial changes of vegetation coverage in Qinling mountains based on Google Earth Engine platform[J]. Bulletin of Surveying and Mapping, 2022, 0(5): 49-55.

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