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Position: Home > Articles > A Research on Stem Sap Flow Dynamics of Ulmus Pumila in Mu Us Sandy Area,Yanchi County Research of Soil and Water Conservation 2008,15 (6) 85-88

盐池毛乌素沙地白榆树干液流研究

作  者：
赵奎;丁国栋;原鹏飞;张进虎;孙毅;刘楠
单  位：
北京林业大学水土保持学院水土保持与荒漠化防治教育部重点实验室
关键词：
毛乌素沙地;白榆;热扩散技术;树干液流
摘  要：
采用基于热扩散原理的ES-SF茎流测量系统,监测了盐池毛乌素沙地白榆树干液流的动态变化,同时用自动气象站记录附近的太阳辐射、最高与最低气温、空气相对湿度、风速等气象因子,探讨气象因子对树干液流的影响。结果表明:白榆树干液流日变化为多峰型,昼夜变化显著且夜间液流量小而稳定,晴天变化幅度最大,阴天变化幅度最小;树干液流主要集中在8:00-18:00,占全天液流总量的80%多;白榆树干液流变化趋势与环境因子变化趋势相吻合,相关性分析表明,影响液流变化的主要环境因子依次为太阳辐射、空气温度、空气相对湿度和风速。
译  名：
A Research on Stem Sap Flow Dynamics of Ulmus Pumila in Mu Us Sandy Area,Yanchi County
作  者：
ZHAO Kui,DING Guo-dong,YUAN Peng-fei,ZHANG Jing-hu,SUN Yi,LIU Nan(College of Soil and Water Conservation,Beijing Forestry University,Key Laboratory of Soil and Water Conservation and Desertification Combating,Ministry of Education,Beijing 100083,China)
关键词：
Mu Us Sandy Area;Ulmus pumila;thermal dissipation method;stem sap flow
摘  要：
The EC-SF Sap Flow Measuring System were applied to study the diurnal changes of stem sap flows for Ulmus pumila based on the thermal dissipation theory.At the same time,the circumstance factors around the Ulmus pumila were recorded by radiation,air temperature,air elative humidity and wind speed sensor,and relationship between the sap flow velocity and the circumstance factors were discussed.The results showed that the diurnal variations of sap flow velocity of the Ulmus pumila were as a multi-peaked curve;the stem sap flow varied regularly in the diurnal term and the sap flow velocity is little and standy;Magnitude of sap flow changed considerably between sunny and rainy days.The sap flow density between 8:00 and 18:00 was the major in one day,and it was more than 80%.The sap flow density of the Ulmus pumila was positively correlated with some ambient environmental factors.The order of their coefficient from correlation analysis was solar radiation >air temperature>air elative humidity>wind speed.

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