In conclusion, grassland in Qilian Mountain National Park showed a trend of degradation based on distribution area, but showed a trend of restoration based on actual NPP.
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Quantitative analysis of the impact of climate variability and human activities on grassland productivity of the Qilian Mountain National Park, China.
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The average annual actual NPP was 163.8 g m -2 a -1 , with an average annual increase of 2.2 g C·m -2 Actual NPP showed an increasing trend from northwest to southeast ( Fig 6 ).