Relationship between stem diameter and transpiration for Japanese cypress trees: Implications for estimating canopy transpiration

Previous studies reported relationships between stem diameter at breast height (DBH) and whole‐tree transpiration (Qt) across a variety of species and locations. It might be possible to develop a relationship between DBH and Qt with smaller variations when we focused on a single species. We attempte...

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Bibliographic Details
Published in:Ecohydrology 2019-07, Vol.12 (5), p.n/a
Main Authors: Tsuruta, Kenji, Komatsu, Hikaru, Kume, Tomonori, Otsuki, Kyoichi, Kosugi, Yoshiko, Kosugi, Ken'ichiro
Format: Article
Language:English
Subjects:
Agriculture
Chamaecyparis obtusa
Correlation
Evergreen trees
Fluctuations
Flux density
Forest management
Herbivores
Plant cover
Plantations
sap flow
sapwood area
Species
Transpiration
tree age
tree size
Trees
Vapor pressure
Vapour pressure
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Summary:Previous studies reported relationships between stem diameter at breast height (DBH) and whole‐tree transpiration (Qt) across a variety of species and locations. It might be possible to develop a relationship between DBH and Qt with smaller variations when we focused on a single species. We attempted to develop such a relationship for Japanese cypress (Chamaecyparis obtusa), which is one of the major plantation species in Japan. We collated Qt for 51 Japanese cypress trees from nine different‐sized and different‐aged stands using the sap flux method. We found a strong linear correlation between DBH and the reference value of Qt at a vapour pressure deficit of 1 kPa (R = .883). This was a consequence of a strong correlation between DBH and sapwood area (AS_tree; R = .973) and the absence of a correlation between DBH and sap flux density (R = −.043). We confirmed that using the relationship between DBH and AS_tree, while assuming typical responses of sap flux density to meteorological factors, provides reasonable Qt estimates. This study also demonstrated how the DBH–Qt relationship can be applied to estimate changes in EC with changing forest management.
ISSN:1936-0584
1936-0592
DOI:10.1002/eco.2097