A GAUGE TO MEASURE THE MASS-FLOW RATE OF WATER IN TREES

被引：6

作者：

CHANDRA, S ^{[1
]}

LINDSEY, PA ^{[1
]}

BASSUK, NL ^{[1
]}

机构：

[1] CORNELL UNIV,INST URBAN HORT,ITHACA,NY 14853

来源：

PLANT CELL AND ENVIRONMENT | 1994年 / 17卷 / 07期

关键词：

HEAT BALANCE; SAP FLOW; TRANSPIRATION; WATER USE;

D O I：

10.1111/j.1365-3040.1994.tb00182.x

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

A gauge that measures the mass flow rate of water in a growing tree is described. The gauge consists of an electric band heater wrapped around a section of the stem, a temperature controller that switches the current to the heater on and off so as to maintain a constant temperature rise across the heated section, and a timer to record the total time for which the heater is switched on. An energy balance shows the mass flow of water to be proportional to the time of operation of the heater. The magnitude of measurement errors is estimated using dimensional analysis and a numerical model. Experimental measurements of the flow rate of water in a tree using the gauge agree well with its recorded loss of weight.

引用

页码：867 / 874

页数：8

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