Water Relations Characteristics of Cryp tomeria japonica D. Don.(VI) : A Simulation Model of Water Regime Using the Parameters Obtained by the P-V Curve Technique
Year: 1987
Type: article
Abstract: A simulation model on water regime of trees was constructed with a use of equations concerning some water relations parameters of leaves measured by pressure-volume (P-V) curve technique and was used to compare the effects of parameters on water regime among 8 cultivars of Cmtomeria japonica under some assumptions. Simulated results showed as follows : owing to the function of leaves as a water reservoir water flow from soil to leaves occurred behind the transpiration and time lag increased when the water flow resistance increased and the pattern of changes of water potential, transpiration, and water flow, respectively, differed between the forenoon and afternoon even though the environments were set symmetrical between them. The drier soil became, i. e. the more negative the soil water potential was, the greater a cultivar Urasebaru, the leaves of which had the higher osmotic potential at full turgor, and Kumotooshi decreased the transpiration rate compared to the other cultivars such as Kijin, Yabukuguri, Iwao, and Yaichi. The simulated effect of the drought on the transpiration was approximately supported by the another experiment. The low resistance to drought of Urasebaru approximately agreed with the growth response in practical fields which is reportedly very sensitive to the site quality. The model could contribute to early test in tree breeding.
DOI: 10.5109/23847
Author: Hisashi Yahata
Institution: Kyushu University
Language: English
Subfield: Global and Planetary Change
Field: Environmental Science
Domain: Physical Sciences
SDG: Zero hunger
Open Access status: green
OpenAlex ID: W2394750466