Some troubles on the measurement of physiological status in field trees : trans-root electric potential and sap-flow measurement

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  • 樹木の野外計測で遭遇した諸問題—根の電位計測と樹液流計測についての検討—
  • 樹木の野外計測で遭遇した諸問題--根の電位計測と樹液流計測についての検討
  • ジュモク ノ ヤガイ ケイソク デ ソウグウ シタ ショ モンダイ ネ ノ デンイ ケイソク ト ジュエキリュウ ケイソク ニ ツイテ ノ ケントウ

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Abstract

In order to get quantitative information on the physiological status of field trees, we tried for 3 years simultaneous and continuous measurement of trans-root electric potential (TRP) by means of the electro-radicograph system which is developed by ourselves and sap-flow by means of the Granier type sap-flow-meters, in the field trees in a mountain area. We had accumulated ample experience on the electro-radicograph, but on the sap-flow system, we had no experience except model experiments in our laboratory. Under the very hard conditions in the mountain area, we met a number of unexpected troubles, to find finally the main obstacle was the bad insulation in the electric circuits caused by the invasion of rain water. Besides, a fundamental technical error in constructing the circuit was discovered in the most of the sap-flow meters imported. Here reported the process how to conquer the difficulties and the final solutions of the problems were.

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