中国1956—2006年地表土壤冻结天数时空分布及其变化特征
王康1, 张廷军2,3,*

Spatial and Temporal Distribution and Variations in the Near-surface Soil Freezing Days across China, 1956-2006
Wang Kang1, Zhang Tingjun1,2,*
图5 中国境内近地表土壤冻结天数与气温的关系 点线为近地表土壤冻结天数逐年的距平值相对于1971#cod#x02014;2000年的均值；直方线为计算的中国境内站点观测的气温变化
Fig.5 Relationship between the number of near-surface soil freezing days and the long-term air temperatures over China Solid closed circles line represents the departures of number of near-surface soil freezing days from the 1971-2000 mean, the histogram is departure of mean annual air temperatures from stations across China