石家庄冻土变化特征与气候因子的关系分析

探讨石家庄冻土变化特征与气候因子的关系,以期作好土壤冻融预测.利用石家庄地区5个观测站1981—2010年逐日地温、降水量、蒸发量和冻土观测数据,采用线性趋势、完全相关系数和多元回归方法,分析讨论了该地区冻土变化特征与地温、降水量、蒸发量的变化关系.结果表明:石家庄地区土壤表面始冻期呈现明显推迟趋势,土壤表面解冻期呈现明显提前趋势,其中,中部地区始冻期推迟,解冻期提前趋势最为明显;11—12月平均地面最低温度与土壤表面始冻期正相关明显,2—3月平均地面最低温度与土壤表面解冻期负相关明显;秋季降水量和蒸发量对土壤表面始冻期推迟,冬季降水量和蒸发量对土壤表面解冻期提前影响较小.

Relational analysis between variation characteristics of frozen soil and influencing climatic factors in Shijiazhuang

Relationship between variation characteristics of frozen soil and the influencing climatic factors were analyzed for the prediction of soil freezing and thrawing in Shijiazhuang.Based on the daily observation data of ground temperature,precipitation,evaporation capacity and frozen soil archived by 5 stations in Shijiazhuang from 1981 to 2010 and methods such as linear trend,multiple regression and complete correlation coefficient,variation relation between characteristics of frozen soil and the influencing climatic factors was analyzed.The results show that,the first freezing date of surface soil had a significant deterring trend while the first thrawing date of surface soil had a significant advancing trend with the middle area having the most significant trend.An obvious positive correlation existed between the average lowest ground temperature during November to December,and the first freezing date of soil surface,while an obvious negative correlation between the average lowest ground temperature during February to March and the first thrawing date of soil surface.Precipitation and evaporation capacity in autumn had weak effect on deterring the first freezing date of soil surface,so is the precipitation and evaporation capacity in winter effect on advancing the first thrawing date of soil surface.