杉木采伐对集水区土壤热状况的影响  

THE EFFECT OF FOREST HARVEST ON THE SOIL THERMAL REGIME IN THE WATERSHED OF CHINESE FIR

作　　者：康文星[1] 闫文德[1] 

机构地区：[1]中南林学院生态教研室,株洲412006

出　　处：《林业科学》2003年第5期156-160,共5页Scientia Silvae Sinicae

基　　金：国家重点野外站资助项目 ( [2 0 0 0 ]国科基便字第 0 76号 ) ;科技部基础研究快速反应支持项目 ( 2 10 2 ) ;国家林业局森林生态系统定位研究项目 ( 2 0 0 1-0 7)部分内容

摘　　要：The soil thermal regime and the effect of forest harvest in the watershed were studied in virtue of thermal conductivity equation in soil and physical principle by 6 years data in Chinese Fir plantation. The results showed that the content of water in the soil determined the change of the thermal capacity, thermal diffusivity and thermal conductivity according to the time in the watershed. With the increasing of soil thermal capacity, the percent of solid and the decreasing of porosity, all thermal factors increased. After forest harvesting, the surface soil became more tighten because of the artificial strong disturbing. So the ratio of solid, liquid and?gas in the soil was changed and the soil thermal regimes were changed, especially the thermal diffusivity and thermal conductivity in 0～5?cm depth soil increased more than one times. The soil thermal regimes were affected by the soil structure and the soil components. But for the each factors of soil thermal regimes, the effect of each components was different, especially to the interaction of each components, which made the thermal diffusivity and thermal conductivity more complex. Therefore, it was very difficult to evaluate the effect of every soil structure and every component.The soil thermal regime and the effect of forest harvest in the watershed were studied in virtue of thermal conductivity equation in soil and physical principle by 6 years data in Chinese Fir plantation. The results showed that the content of water in the soil determined the change of the thermal capacity, thermal diffusivity and thermal conductivity according to the time in the watershed. With the increasing of soil thermal capacity, the percent of solid and the decreasing of porosity, all thermal factors increased. After forest harvesting, the surface soil became more tighten because of the artificial strong disturbing. So the ratio of solid, liquid and?gas in the soil was changed and the soil thermal regimes were changed, especially the thermal diffusivity and thermal conductivity in 0～5?cm depth soil increased more than one times. The soil thermal regimes were affected by the soil structure and the soil components. But for the each factors of soil thermal regimes, the effect of each components was different, especially to the interaction of each components, which made the thermal diffusivity and thermal conductivity more complex. Therefore, it was very difficult to evaluate the effect of every soil structure and every component.

关 键 词：杉木采伐 集水区 土壤热状况 影响因素 容积热容量 热扩散率 导热率 

分 类 号：S782.1[农业科学—木材科学与技术]