Spatiotemporal variation in vegetation phenology and its response to climate change in marshes of Sanjiang Plain, China.

(3) θ slope = n × ∑ i = 1 n i × Mi − ∑ i = 1 n i × ∑ i = 1 n Mi n × ∑ i = 1 n i 2 − ∑ i = 1 n i 2 Here, M i refers to the variables value in the ith year; n means the period length and is 20 in this work; i refers the serial number of year; θ slope is the variation trend in variables of each pixel, if θ slope > 0, it means that the variables have an increasing trend, otherwise it is reduced. 2.3.4.

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The region with a decreasing trend was located in the middle and southeast of study region (Figure 2f ). 3.3.

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