Asymmetric seasonal daytime and nighttime warming and its effects on vegetation in the Loess Plateau.

Among them, the NDVI and T max showed an extremely significant positive correlation in spring and winter ( p < 0.01), a significant positive correlation in autumn ( p < 0.05), and no correlation in summer ( p > 0.05).

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T max in summer had a significant increasing trend is 85.5% ( p< 0.05) of the area, among which 47.8% had a highly significant increasing trend ( p <0.01) ( Fig 3 ).

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In autumn, T max in most areas showed an increasing trend, among which of 18.8% was a significant trend ( p < 0.05), mainly in west of the area.

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Only 3% of the regions showed a decreasing trend ( p> 0.05), mainly in the northeast of the area ( Fig 4A ).

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T max of the Loess Plateau in spring showed an increasing trend from 1982 to 2015 and 99.1% of the area showed a significant increasing trend ( p< 0.05), among which 90.9% showed the highest and most significant increasing trend ( p <0.01) ( Fig 2A ).

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