Influences of vertical differences in population emigration on mountainous vegetation greenness: A case study in the Taihang Mountains.

From the perspective of the annual variation trend, NDVI showed a significantly increasing trend during 2000–2004 at all regions with different elevations and, subsequently, a decreasing trend in the lower- and middle-elevation regions, but a stable level in the higher-elevation regions during 2004–2006.

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Overall, the factors affecting the variation trend of vegetation greenness in Taihang Mountains showed a clear trend: at lower elevations, vegetation greenness was mainly influenced by population emigration; with the rise of elevation, the influences of natural factors become more and more significant, while the factor of population emigration began to recede.

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The NDVI values in about 92.3% of the Taihang Mountains showed an increasing trend, in which the area of the regions with Slope values between 0 and 0.006 accounted for about 30.6% and that of the regions with Slope values between 0 and 0.012 accounted for about 76.7%.

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