Pachmeter

Japanese: pachmeter
Pachmeter

... Water balance can be determined by filling a sealed container with water and placing the roots of a plant inside it, and measuring the decrease in the weight of the entire device (transpiration) and the decrease in the height of the liquid column in the L-shaped tube, which is read as the decrease in water in the container (water absorption). Also, by using a pachymeter to measure minute changes in leaf thickness, it is possible to determine whether the leaf's moisture content has increased or decreased within a short period of time. Changes in water balance throughout the day are usually negative during the day and positive from evening to night. ...

*Some of the terminology that mentions "pachmeter" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

… 細いL字管をつけた密閉した容器に水を満たし植物の根の部分を入れ,この装置全体の重量の減少(蒸散)とL字管の液柱の高さの低下から読み取られる容器中の水の減少(吸水)を測定することにより水の収支を知ることができる。また,葉の厚さの微小な変化を測定するパキメーターpachmeterを用いれば,短時間内に葉の水分が増加したか減少したかを知ることができる。 一日中の水収支の変化は,ふつう日中は収支が負となり,夕方から夜間にかけて正となる。…

※「pachmeter」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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