土壤温度对油松(Pinus tabulaeformis)树干液流活动的影响  

Influence of soil temperature on sap flow of Pinus tabulaeformis

作　　者：徐军亮[1,2] 马履一[2] 

机构地区：[1]河南科技大学林学院,河南洛阳471003 [2]北京林业大学省部共建森林培育与保护教育部重点实验室,北京100083

出　　处：《生态学报》2008年第12期6107-6112,共6页Acta Ecologica Sinica

基　　金：国家自然科学基金资助项目(30371147);国家教育部高等学校博士点基金资助项目(20030022009);北京市自然科学基金资助项目(6052016);北京林业大学省部共建重点实验室基金资助项目(JD100220535)~~

摘　　要：为了弄清土壤温度对油松树干边材液流活动的影响作用,利用热扩散式边材液流测定系统(TDP-30)和自动气象站对油松边材液流速率和土壤温度等环境因子进行了为期一年的同步测定。结果表明,土壤温度对树干液流活动的影响,一方面与靠近植物最适吸水温度的土层有关,另一方面,与树种的根系分布特征有关。春季表层土壤温度对液流速率的影响最为显著,夏季深层土壤最大,秋季的最大影响土层间于春夏之间。10.0～14.9℃的土壤温度对油松树干边材液流活动的作用最为明显。土壤温度开始对油松液流活动起显著作用的温度阈值约为10℃左右。Studies on the relationship between sap flow activities and major environmental factors have mainly focused on solar radiation; air temperature, air moisture, soil moisture and vapor pressure deficit, however, the effect of soil temperature were usually neglected. In fact, soil water may not be available to trees and thus leading to the potential loss of forest yield due to reduction of transpiration and photosynthesis by low soil temperature. Therefore quantified studies on the influence of soil temperature on sap flow are necessary. Accordingly, the sap flow velocity of Pinus tabulaeformis, soil temperature and other environmental factors were synchronously measured in one year with Thermal Dissipation Probe systems （TDP-30） and an automatic weather station. The results show that the soil layers in which soil temperature has strong effect on sap flow velocity are related with root distributions, and soil temperature conditions at which water could be easier absorbed. Soil temperature of surface layer has the most significant influence on sap flow activities in spring while that of deep layer in summer and middle layer in autumn. Furthermore, the effect of soil temperature on sap flow is most significant at 10.0 -- 14.9℃, and the soil temperature threshold is about 10℃.

关 键 词：油松 土壤温度 边材液流速率 温度阈值 

分 类 号：S791.254[农业科学—林木遗传育种]