Articles
Diurnal changes in embolism and sap flow in living tree trunks
Article number
1419_11
Pages
81 – 86
Language
English
Abstract
In living tree trunks, cavitation occurs in the water-conducting tissue, leading to embolism.
The occurrence of embolism can be evaluated using the acoustic emission (AE) method, which detects and monitors ultrasonic stress waves released when cavitation occurs.
However, long-term measurements have rarely been conducted to understand the factors and patterns of embolism.
As tree sap is essential for the transport of nutrients and phytohormones within the tree, elucidating its variation is fundamental to understanding the physiological survival strategies of trees.
The aim of this study is to examine the variation of sap flow and embolism in a sapling.
We used an olive sapling in our experiment, which was conducted at Kobe University, Japan from May to December 2021. The number of AE events was recorded at 10-min intervals, and the sap flow velocity was measured using a heat flux sensor.
Both AE and heat flux sensors are non-destructive measurement methods.
In the olive sapling, few AE events were observed after the first irrigation, and the number of AE events gradually increased after 27 days.
When irrigation was applied during this period of AE generations, AE events decreased temporarily, but then reoccurred soon after.
As described above, we confirmed that the number of AE events in an olive sapling changes in response to irrigation.
The occurrence of embolism can be evaluated using the acoustic emission (AE) method, which detects and monitors ultrasonic stress waves released when cavitation occurs.
However, long-term measurements have rarely been conducted to understand the factors and patterns of embolism.
As tree sap is essential for the transport of nutrients and phytohormones within the tree, elucidating its variation is fundamental to understanding the physiological survival strategies of trees.
The aim of this study is to examine the variation of sap flow and embolism in a sapling.
We used an olive sapling in our experiment, which was conducted at Kobe University, Japan from May to December 2021. The number of AE events was recorded at 10-min intervals, and the sap flow velocity was measured using a heat flux sensor.
Both AE and heat flux sensors are non-destructive measurement methods.
In the olive sapling, few AE events were observed after the first irrigation, and the number of AE events gradually increased after 27 days.
When irrigation was applied during this period of AE generations, AE events decreased temporarily, but then reoccurred soon after.
As described above, we confirmed that the number of AE events in an olive sapling changes in response to irrigation.
Publication
Authors
T. Kogire, W.A. Azuma, H. Ishii, K. Kuroda
Keywords
embolism, cavitation, sap flow, field measurement, broad-leaved tree
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