| 应用SWR技术研究垂柳茎体含水率 |
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| 引用本文： | 王海兰,鲍际平,赵燕东. 应用SWR技术研究垂柳茎体含水率[J]. 科技导报(北京), 2009, 27(8) |
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| 作者姓名： | 王海兰 鲍际平 赵燕东 |
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| 作者单位： | 北京林业大学工学院,北京,100083;北京林业大学工学院,北京,100083;北京林业大学工学院,北京,100083 |
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| 基金项目： | 国家自然科学基金,国家科技支撑计划,林业公益性行业科研专项基金 |
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| 摘 要： | 应用驻波率(SWR)技术对垂柳茎体含水率进行了较长期的监测,验证了SWR技术可以用来定量监测乔木茎体的含水率.实验结果如下:①对垂柳茎体含水率的日变化观测结果表明,在晴天茎体含水率呈下降趋势,下降范围为7%-4%,下午又基本恢复到起始状态;阴雨天茎体含水率的日变化范围较小,为4%-2%;②茎体含水率季节性变化观测结果表明,垂柳茎体含水率具有周期性变化的规律,变化范围为18%-10%;③受根部土壤水分和叶片蒸腾耗水的均衡作用,垂柳茎体含水率基本保持在一定的范围内变化;④不同深度的土壤水分变化情况不同,深度为35 cm的土壤传感器水分变化最剧烈,受降水、根系吸水和近地面空气层影响也最大,而离地表越深,土壤水分变化越小.
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| 关 键 词： | 茎体含水率 驻波率 介电常数 土壤含水率 |
Measurement of Stem Water Content of Salix Babylonica Using Standing Wave Ratio Principle |
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| WANG Hailan,BAO Jiping,ZHAO Y,ong School of Technology,Beijing Forestry University,Beijing ,China. Measurement of Stem Water Content of Salix Babylonica Using Standing Wave Ratio Principle[J]. Science & Technology Review, 2009, 27(8) |
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| Authors: | WANG Hailan BAO Jiping ZHAO Y ong School of Technology Beijing Forestry University Beijing China |
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| Affiliation: | WANG Hailan,BAO Jiping,ZHAO Y,ong School of Technology,Beijing Forestry University,Beijing 100083,China |
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| Abstract: | This paper studies the feasibility of measuring changes of the stem water content using SWR (Standing Wave Ratio, SWR) principle. In our experiment, salix babylonica tree was exposed to natural conditions. The results show that: (1) the diurnal change of the stem water content decreases from 7% to 4% in sunny days, and is recovered in the afternoon; while in rainy days the change is small, from 4% to 2%; (2) the seasonal change ranges from 18% to 10%; (3) the root-zone soil water content has a little influe... |
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| Keywords: | stem water content standing wave ratio dielectrics soil water content |
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