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《Journal of Arid Land Resources and Environment》 2018-12
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Dynamics of sap flow rates in stems of typical desert shrub Tamarix ramosissima and its responses to the environmental factors

LI Shuang;DU Jiankuo;XIAO Honglong;School of History and Tourism,Shaanxi University of Technology;Key laboratory of Ecohydrology of Inland River Basin,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences;  
To explore the relationships between sap flow velocity and main environmental factors in arid desert areas without irrigation condition,the Flow 32 heat balance gauge was used to monitor the sap flow of T. ramosissima during June to September of 2013. The environmental factors were also monitored simultaneously. The results showed that:( 1) the diurnal variations of stem sap flow rate differed with weather conditions. The partial correlation analysis revealed that the order of the main meteorological factors affecting the sap flux of T. ramosissima were: solar radiation vapor pressure deficit air temperature air relative humidity wind speed.( 2) The relationship between stem sap flow rate and solar radiation displayed evident and asymmetric variations in the morning and afternoon,and their relationships reached a high significant level( P 0. 01) with large determination coefficients( R2) over 0. 930.( 3) There was still little sap flow at night. Nighttime sap flow was typically 3. 92% ~ 13. 53% of daytime rates. The stomata of the plant was not completely closed at night,and about 50% of sap flow contributed to transpiration during nighttime.
【Fund】: 国家自然科学基金重大研究计划项目(91125025);; 陕西理工大学人才启动项目(SLGQD-06);; 横向项目(208020957)资助
【CateGory Index】: S793.5
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