Spatially, the HDD appeared a decreasing trend from Henan to Hunan, while the CDD showed an opposite character.

HDD由河南向湖南基本上呈现递减的趋势，CDD与HDD呈相反的变化特征。

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Spatially, the HDD appeared a decreasing trend from Henan to Hunan, while the CDD showed an opposite character.

HDD由河南向湖南基本上呈现递减的趋势，CDD与HDD呈相反的变化特征。

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