3 , where it can be seen that the NPP presents a regular spatiotemporal distribution, and shows a decreasing trend from southeast to northwest.
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Assessing the Spatiotemporal Variation and Impact Factors of Net Primary Productivity in China.
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The sentences
The NPP in the north of China has shown an increasing trend in spring over the 12 years, while the NPP in northeastern China ( Fig. 1 , area 6) has shown a decreasing trend.