| 黑河下游天然胡杨树干液流特征的试验研究 |
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| 引用本文： | 张小由,康尔泗,张智慧,张济世.黑河下游天然胡杨树干液流特征的试验研究[J].冰川冻土,2005,27(5):742-746. |
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| 作者姓名： | 张小由 康尔泗 张智慧 张济世 |
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| 作者单位： | 中国科学院寒区旱区环境与工程研究所，中国科学院寒区旱区环境与工程研究所，中国科学院寒区旱区环境与工程研究所，中国科学院寒区旱区环境与工程研究所 甘肃兰州730000，甘肃兰州730000，甘肃兰州730000，甘肃兰州730000，兰州交通大学，甘肃兰州730070 |
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| 基金项目： | 国家自然科学基金
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中国科学院引进国外杰出人才基金 |
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| 摘 要： | 应用热扩散原理,采用ICT2000TE 研究了黑河下游25 a生天然胡杨(Populus euphratica)的树干液流特点及其与环境因子的关系.结果表明:1) 在整个生长季的晴天,胡杨树干液流的日变化呈现明显的单峰宽峰曲线.液流速率在6、7、8、9和10月分别为13.39、12.07、12.69和5.1 L·d-1;2) 胡杨在夜间有微弱上升液流,可能存在根压;3) 在生长季树干液流速率与环境因子逐步回归分析结果表明,树干液流受环境因子的综合影响,影响大小依次是空气温度、土壤含水量、相对湿度、总辐射、土壤温度和风速.
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| 关 键 词： | 热扩散法 胡杨 树干液流 环境因子 |
| 文章编号： | 1000-0240(2005)05-0742-05 |
| 修稿时间： | 2005年1月23日 |
A Study of the Stem Sap Flux of Populus euphratica in the Lower Reaches of Heihe River |
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| ZHANG Xiao-you,\ KANG Er-si.A Study of the Stem Sap Flux of Populus euphratica in the Lower Reaches of Heihe River[J].Journal of Glaciology and Geocryology,2005,27(5):742-746. |
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| Authors: | ZHANG Xiao-you \ KANG Er-si |
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| Institution: | ZHANG Xiao-you,\ KANG Er-si~ |
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| Abstract: | The stem sap flow characteristics of 25-year-old Populus euphratica trees and their relation to environmental factors were studied based on the heat diffusion principle and using ICT200TE.It is revealed that: 1) The daily variation of stem sap flow of P.euphratica on clear days in the whole growing season can be described with an evident unimodal curve.The sap flow rates in June,July,August,September and October are 13.39,12.07,12.69 and 5.1 L\5d~(-1),respectively.2) In the night there is a weak rising sap flow,suggesting a presence of root pressure.3) A stepwise regression analysis of the sap flow rate per hour and environmental factors shows that the stem sap flow can be affected by a number of environmental factors,which,in terms of the influential degree, can be arranged in the descending order: air temperature,soil moisture content,relative humidity,total solar radiation,soil temperature and wind velocity. |
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| Keywords: | heat diffusion method Populus euphratica stem sap flow environmental factors |
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