西南亚高山森林土壤表层温度变化特征及拟合模型  

Annual Temperature Dynamic Characteristics and Modeling of Subalpine Forest Topsoil in Southwestern China

作　　者：李沙[1] 刘冬梅[2] 孙辉[1] 

机构地区：[1]四川大学环境科学与工程系,四川成都610065 [2]四川省环境保护科学研究院,四川成都610041

出　　处：《西北林学院学报》2013年第3期34-39,共6页Journal of Northwest Forestry University

基　　金：国家自然科学基金(40871124;41271094);中央高校基本科研业务费项目(2010SCU22007)

摘　　要：为探索土壤温度时间动态特征与导温率及土壤深度之间的关系,以西南亚高山森林表层土壤温度为研究对象,分析了2009—2010年每月28日或29日不同土层土壤温度的日变化特征,并对不同月份不同深度温度日变化建立数学模型并进行数据拟合。结果表明,亚高山森林0～40cm土壤温度日较差随着土壤深度的增加逐渐减小,其中0～20cm土壤温度日较差明显,20～40cm的深层土壤温度日较差很小;40cm深度土壤温度日进程基本上处于稳定状态,在冬季30cm以下深度土壤温度都基本上处于稳定状态;随着深度的增加,土壤温度最高值和最低值出现滞后时间延长的趋势,而且同一土壤深度滞后时间在不同月份差异很大;非冻融季节土壤温度日变化用土壤温波方程来拟合是有效的;在低温季节(9月至次年3月),10cm以下土壤剖面温度用土壤温波方程拟合误差较大,显示土壤冻结对土壤热量传输影响显著,温波方程不适于拟合冻融期土壤温度日动态。In order to understand the relationships between dynamic characteristics of soil temperature（ST） and the rate of thermal conductivity,as well as the soil depth,taking the facial soil in subalpine coniferous forest in southwestern China as research object,daily variation characteristics of ST in different layers in the day of 28th or 29th each month during 2009 to 2010 were examined.Daily dynamic changes of ST in different months and different layers were modeled and simulated.The results demonstrated that daily relative differences（DRD） of ST of subalpine forest in the soil profiles of 0 to 40 cm decreased with the increase of soil depth,in which DRD of ST in the depths of 0 to 20 cm was significant,while not significant in the depths of 20 to 40 cm.In addition,daily ST in the soil depth of 40 cm was stable,and also stable in the soil depths over than 30 cm in winter.Data regression showed that lag time of ST increased with soil depth and could be characterized with a temporal variance,and soil daily temperature process could be regressed well by initial soil temperature model only in freeze-free season,which indicated that freeze-thaw patterns impacted soil thermal processes and temperature dynamics in cold season from September to next March.

关 键 词：亚高山森林 森林土壤 土壤温度 温度模型 低温生态系统 

分 类 号：S714.2[农业科学—林学]