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4 中国境内近地表土壤冻结天数的距平气候基准值：1971#cod#x02014;2000年的平均值 点线为逐年的距平值,阴影部分为1个标准差的置信区间；虚线是零值参考线,实线为趋势线
Fig.4 Departures of the number of near-surface soil freezing days from the 1971-2000 mean across China Solid circle represents departures, the shadow region is 1 standard deviation; Dashed line represents the zero reference line, solid line is linear trend