秦岭火地塘林区油松林土壤热通量  

Soil Heat Fluxes in Pinus tabulaeformis Forest at Huoditang Forest Region in the Qinling Mountains

作　　者：胡兆永 陈书军[1] 庞军柱[1] 张硕新[1] 

机构地区：[1]西北农林科技大学,杨凌712100

出　　处：《东北林业大学学报》2014年第6期53-57,共5页Journal of Northeast Forestry University

基　　金：国家林业局林业公益性行业科研专项(201004036)

摘　　要：以2012年1月1日-12月31日土壤热状况的实测数据为基础，研究了秦岭火地塘林区油松林土壤热通量的变化特征及其与净辐射的关系。结果表明：10和20cm层土壤非生长季和生长季热通量的日变化均呈“S”型，且前者振幅较大；两层土壤3—8月的热通量月累计均为正值，其它月份累计均为负值．月总值占净辐射的比例变动范围分别为-17．50％～3．11％和-18．61％～3．72％：10和20cm层土壤年总热通量分别为-2．33、-2．16MJ·m-2，说明就全年尺度而言，土壤是热源；在日尺度和月尺度水平上，土壤热通量和净辐射均为极显著正相关：土壤热通量对净辐射的反馈存在延时效应，10cm层在非生长季反馈要延滞3h，生长季为4h：而20cm层的反馈延滞在非生长季为5h，生长季为7h。With the soil thermal measurements from January 1 to December 31,2012, we studied the characteristics of soil heat fluxes and the relationship between soil heat fluxes and solar net radiation in Pinus tabulaeformis forest at Huoditang forest region in the Qinling Mountains. The diurnal changes of soil heat fluxes at 10 cm depth and 20 cm depth have an ＂S＂ shape both in the growing season and non-growing season. The fluctuation of soil heat at 10 cm depth is stronger than that at 20 cm. The value of monthly accumulation of soil heat fluxes from March to August at 10 cm and 20 cm depth are positive, while there is negative value in other months. The proportion of monthly soil heat fluxes to the net radiation at the two depth ranges from -17.50% to 3.11% and -18.61% to 3.72% , respectively. The total soil heat fluxes in a year at 10 cm and 20 cm depth are -2.33 and -2.16 MJ m-2, respectively, indicating that the soil is a heat source at the annual temporal scale. Significant correlations between the soil heat fluxes and net radiation were observed at both 10 cm and 20 cm depth at daily and monthly annual temporal scales. There is time-lag effect in soil heat fluxes to net radiation, with three hours＇ time-lag in growing season and four hours＇ time-lag in non-growing season at 10 cm depth and five hours＇ time-lag in growing season and seven hours＇ time-lag in non-growing season at 20 cm depth.

关 键 词：秦岭 油松 土壤热通量 净辐射 

分 类 号：S152.8[农业科学—土壤学] S718.5[农业科学—农业基础科学]