Effects of tree-to-tree and radial variations on sap flow estimates of transpiration in Japanese cedar

Tomo'omi Kumagai, Sayaka Aoki, Hisami Nagasawa, Tetsuya Mabuchi, Katsuyoshi Kubota, Sachiko Inoue, Yasuhiro Utsumi, Kyoichi Otsuki

研究成果: ジャーナルへの寄稿学術誌査読

74 被引用数 (Scopus)

抄録

To scale sap flux density (Fd) measurements of individual trees to stand level transpiration (E), the mean stand Fd (JS) is among the most important factors, because E is frequently estimated as a product of JS and stand sapwood area. Major uncertainties in J S estimations are caused by tree-to-tree and radial variations in Fd. Thus, by using the Monte Carlo sampling technique with original tree-to-tree Fd data measured at several depths, we examined how many trees and radial depths need to be sampled for calculation of appropriate JS. In this study, Fd was measured in 14 mature Japanese cedar (Cryptomeria japonica) trees at several radial depths, 0-2, 2-4 and 4-6 cm, using Granier-type sensors. The results revealed that the potential error in JS with the largest available sample size was not stable even though radial profiles in Fd for all sample trees were measured. They also showed that to consider radial variation in Fd it might be necessary to sample at least six trees, but not necessarily more than this. The results imply that, for E estimations, there is more tree-to-tree variation in F d than in radial variation in Fd.

本文言語英語
ページ(範囲)110-116
ページ数7
ジャーナルAgricultural and Forest Meteorology
135
1-4
DOI
出版ステータス出版済み - 12月 14 2005

!!!All Science Journal Classification (ASJC) codes

  • 林業
  • 地球変動および惑星変動
  • 農業および作物学
  • 大気科学

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