塔克拉玛干沙漠腹地多枝柽柳茎干液流及耗水量  

Stem sap flow and water consumption of Tamarix ramosissima in hinterland of Taklimakan Desert

作　　者：许浩[1] 张希明[1] 闫海龙[1] 姚世军[1] 

机构地区：[1]中国科学院新疆生态与地理研究所

出　　处：《应用生态学报》2007年第4期735-741,共7页Chinese Journal of Applied Ecology

基　　金：中国科学院知识创新工程重要方向项目(KZCX3-SW-342-02);国家科技部"西部开发科技行动"重大资助项目(2004BA901A21-1)

摘　　要：2005年4—11月,利用植物茎流计研究了塔克拉玛干沙漠腹地沙漠公路防护林植物多枝柽柳的茎干液流特性和耗水量.结果表明:在极端干旱的沙漠腹地,土壤水分充足时,直径为3.5和2.0cm的多枝柽柳在整个生长季的日平均耗水量分别为6.322和1.179kg;多枝柽柳的茎干液流呈单峰曲线型,有明显的昼夜变化规律,茎干液流随环境因子变化而波动;在土壤水分充足的条件下,总辐射、风速、温度是影响茎干液流变化的主要环境因子,可以用总辐射和风速的线性回归模型预测茎干液流的变化.沙漠腹地多枝柽柳的蒸腾耗水量相对较高,是因为在较为充足的水分供应条件下,多枝柽柳通过大量的水分消耗来抵御干燥高温的沙漠环境.From April to November 2005, the stem sap flow and water consumption of Tamarix rarnosissima in the hinterland of Taklimakan Desert was measured by Flow-32 System. The results showed that, in the extremely arid hinterland of Taklimakan Desert and under enough water supply, the average daily water consumption of T. rarnosissima with a stem diameter of 3.5 cm and 2. 0 cm was 6. 322 kg and 1. 179 kg, respectively in one growth season. The stem sap flow of T. ramosissima presented a single-peaked curve, with an obvious day and night vm-iation rhythm and fluctuated with environment factors. Under enough water supply, the environmenal factors such as total radiation, wind speed and air temperature were the main factors affecting the stem sap flow, and the dynamics of stem sap flow could be predicted by the liner regression model based on total radiation and wind speed. Because of the extremely arid environment and enough water supply, T. rarnosissima had a relatively higher stem sap flow rate and a great water consumption.

关 键 词：塔克拉玛干 多枝柽柳 茎干液流 蒸腾耗水量 

分 类 号：S793.5[农业科学—林木遗传育种]