Title: Measuring Stem Sap Flow and Simulating Transpiration of Populus euphrtaicr by Heat Pulse Technique
Abstract: It is very and necessary important to research water consumption of natural vegetation and its characteristics in arid zone in order to maintain and revive ecological system of oasis especially in Tarim river basin.The heat pulse method for measuring sap flow in plants stem was developed and tested to provide a means for investigating transpiration of single plants under conditions without disturbing the environment.In this paper,the heat-pulse technique was applied to study the stem sap flow of Populus euphrtaicr in water-balance station in Akesu.We investigated the diurnal variation of stem sap flow,the variation of sap flow with different diameters of cross section and the variant characteristics of stem sap flow of Populus euphrtaicr in different areas.The experimental results show that,in the natural conditions,the intensity of sap flow of Populus euphrtaicr was 0.450 L/(cm2·d).During the growth season from April to August,the water consumption of Populus euphrtaicr is 78.335 L/d.Daily changes of stem sap flow of Populus euphrtaicr in this study obviously have a temporal regularity.In daytime,the diurnal variation of sap flow of Populus euphrtaicr shows dual-peaks characteristics.While at night,the speed of sap flow is steadily lower.It has two peaks at 10:00 and 18:00 respectively.For different diameters of cross section of Populus euphrtaicr,the speed of stem sap flow is different.The diurnal change of volume of sap flow showed minor fluctuations closely related to the change of micrometeorological factors.Moreover,it established the mathematical model being verified by the data of actual measurement.Among the transpiration models of Populus euphrtuicr, semi-experiential model is the most ideal.
Publication Year: 2007
Publication Date: 2007-01-01
Language: en
Type: article
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