河北省活动积温时空分布规律研究

Study on the Temporal and Spatial Distribution of Active Accumulated Temperatures in Hebei Province

为了解河北省作物生长发育和产量形成的热量条件,利用1961～2009年河北省139个观测站的逐日气温资料,应用线性趋势分析、样条函数插值等方法分析河北省≥0℃、≥10℃活动积温的时空分布特征.结果表明：（1）49年来河北省大部分地区≥0℃（≥10℃）活动积温的最小值出现在20世纪70年代,≥0℃（≥10℃）活动积温的最大值出现在1991年之后.从整体看,河北省≥0℃（≥10℃）活动积温在增加.（2）1961～2009年的河北省≥0℃（≥10℃）活动积温空间差异较大,大部分地区介于2700～5016℃·d（2185～4526℃·d）,其中冀南平原地区活动积温最大,沿海地区活动积温居中,冀北高原地区活动积温最小.（3）1961～2009年的河北省≥0℃（≥10℃）活动积温的相对变率南北差异较大,冀北高原活动积温相对变率明显大于冀南平原;≥0℃活动积温比≥10℃活动积温稳定.

In order to study the thermal conditions on crop growth and agricultural production in Hebei Province,based on the daily temperature data from 139 stations in Hebei Province from 1961 to 2009,linear trend analysis,spline function interpolation and other methods were used to study the temporal and spatial distribution characteristic of active accumulated temperatures above 0℃ and 10℃.The results showed that：（1） In most parts of Hebei Province in recent 49 years,the minimum of active accumulated temperatures above 0℃ （≥10℃） appeared in the 1970s,and the maximum appeared after 2001.In overall,the active accumulated temperature over 0℃ （≥10℃） is increasing in Hebei Province.（2） active accumulated temperatures over 0℃ （≥10℃） had a large spatial difference in Hebei Province from 1961 to 2009,most regions were between 2700～～5016℃ · d（2185～～4526℃ · d）.The south Hebei plain had the largest active accumulated temperature,coastal region was following,and the north plateau of Hebei had the least active accumulated temperature.（3） The relative change rate of active accumulated temperatures over 0℃ （≥10℃） had large spatial differences in Hebei Province from 1961 to 2009,and was obviously greater than that of the south Hebei plain.The active accumulated temperatures over 0℃ were more stable than that above 10℃.