SIMPLE AUTOMATIC SCANNING AND RECORDING SYSTEM FOR MEASUREMENT OF WATER POTENTIALS WITH DROPLET THERMOCOUPLE PSYCHROMETERS

被引：5

作者：

BARRS, HD

机构：

[1] Botany Department, Duke University, Durham, North Carolina

来源：

NEW PHYTOLOGIST | 1969年 / 68卷 / 04期

关键词：

D O I：

10.1111/j.1469-8137.1969.tb06504.x

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

A simple, automatic scanning and recording system designed specifically to receive the output from up to twenty‐five droplet thermocouple psychrometers is described. Essential components are a solenoid‐operated, low‐level switch, a high grade preamplifier and a potentiometric chart recorder capable of remote operation. Chart traces show noise level is low even on a 10 μV range. Provision is made to correct psychrometer readings for temperature effects due to heat of respiration. Statistical comparison of psychrometer calibrations obtained with this system and with manual switching into a reflecting galvanometer show the former system is at least as accurate as the latter. Parallel leaf water potential measurements made with the two systems agreed closely. Copyright © 1969, Wiley Blackwell. All rights reserved

引用

页码：1041 / &

共 11 条

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