Results Trends of NPP A change In the study area, the model-simulated grassland NPP A shows an increasing trend over majority (69.7%) of the grassland in Xinjiang (Fig. 1a ).
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Grassland dynamics in response to climate change and human activities in Xinjiang from 2000 to 2014.
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The increase may be related to the fact that, in the past ten years, the average annual temperature and precipitation in Xinjiang have increased, showing an overall trend of warm - wet climate 17 .
Within the three types of grasslands in Xinjiang, the desert grassland showed the greatest NPP A increasing trend that mostly attributed to human activities; the meadow showed an overall NPP A decreasing trend that was mainly caused by human activities; the steppe showed similar NPP A decreasing and increasing trend in terms of area percentage.