Processes and mechanisms of vegetation ecosystem responding to climate and ecological restoration in China.

Identifying the forces driving the interannual NDVI variation Based on pixels, the absolute interannual change rate of NDVI was calculated by the unitary linear regression analysis method: the computation equation is expressed as (2) θ slope = n × ∑ i = 1 n ( i × N D V I i ) − ∑ i = 1 n i ∑ i = 1 n N D V I i n × ∑ i = 1 n i 2 − ( ∑ i = 1 n i ) 2 where n is for times; NDVI i is the interannual NDVI of one pixel in time i ; θ slope > 0 indicates an increasing trend, and the converse denotes a decreasing trend; and | θ slope | ≈ 0 shows that there is almost no change in the interannual NDVI.

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Of the area before the breakpoint, 45.4% showed a trend of vegetation decrease, which was concentrated mainly in east China, while 43% of the area after the breakpoint also showed vegetation degradation, mainly in northwest China.

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