In different seasons, both spring and summer minimum temperatures showed an increasing trend, but minimum temperatures in autumn and winter decreased during the study period ( Table 3 ).
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Spatiotemporal Change of Net Primary Productivity and Its Response to Climate Change in Temperate Grasslands of China.
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In recent decades, human activities have caused grassland degradation and a decreasing trend in NPP of temperate grasslands ( Jiang et al., 2021 ).