【摘要】 土壤温度是森林气候的重要因素,与植物的生长关系密切。不同坡度和坡向的林分,光照条件的差异使林内的土壤温度和土壤热通量发生相应的变化。为研究试验区不同林分水热平衡规律,本试验监测了林木生长季土壤和大气温度。结果表明:整个生长季的平均地温林外>阳坡>阴坡,6-10月不同土层温度的变化规律是先下降后上升;土壤不同土层间温度极差值随气温的增高而减小;土壤容积比热容和土壤体积含水量呈直线型递增关系;表层土壤典型天气土壤热通量日变化规律总体趋势一致,呈单峰曲线,变化幅度晴天>阴天、林外>林内,随着气温的降低,土壤热通量的交换由表层向下传导转变为由下层向地表传导,土壤热通量值逐渐降为负值,阴天的降幅较大。更多还原

【Abstract】 Soil temperature is an important factor in the forest climate,and closely related to the growth of plants.Soil temperature and soil heat flux vary with different slopes,aspect of stands,and different lighting conditions.In order to study the heat balance of different forest watershed rule,the experiment monitors the forest soil and atmospheric temperature in the growing season.The results show that the average geothermal outside of stands >sunny slope>shady slope during the whole growing season.A different variation of soil temperature first decreased and then increased from June to October.The range of temperature in different soil layers decreased with increased temperature.Volumetric heat capacity of soil and soil volumetric water content showed a linear increase relationship.Typical weather in the surface soil on soil heat flux variation of the same overall trend showed a single peak curve.The magnitude of changes sunny >cloudy,forest outside >the forest.With the temperature reduced,the exchange of soil heat flux from the surface down to the lower conduction changed into ground to surface conduction.Soil thermal flux gradually reduced to a negative value,more pronounced on cloudy days.更多还原