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[1]ZHAO Kui,DING Guo-dong,YUAN Peng-fei,et al.A Research on Stem Sap Flow Dynamics of Ulmus Pumila in Mu Us Sandy Area, Yanchi County[J].Research of Soil and Water Conservation,2008,15(06):85-88.

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A Research on Stem Sap Flow Dynamics of Ulmus Pumila in Mu Us Sandy Area, Yanchi County

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 15 Number of periods: 2008 06 Page number: 85-88 Column: Public date: 2008-12-20

Title:: A Research on Stem Sap Flow Dynamics of Ulmus Pumila in Mu Us Sandy Area, Yanchi County

Author(s):: 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

Keywords:: Mu Us Sandy Area; Ulmus pumila; thermal dissipation method; stem sap flow

CLC:: S792.19.02

DOI:: -

Abstract:: 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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