Sources of error in estimating stand transpiration using allometric relationships between stem diameter and sapwood area for Cryptomeria japonica and Chamaecyparis obtusa

Tomo'Omi Kumagai, Hisami Nagasawa, Tetsuya Mabuchi, Shigeru Ohsaki, Katsuyoshi Kubota, Kimio Kogi, Yasuhiro Utsumi, Shinya Koga, Kyoichi Otsuki

研究成果: ジャーナルへの寄稿学術誌査読

58 被引用数 (Scopus)

抄録

Estimations of stand sapwood area (A S_stand) are among the most critical factors for determining stand transpiration (E) using sap flux measurements. A S_stand is generally estimated using stem diameter (DBH) data measured for all trees in a stand and an allometric equation that describes the relationship between DBH and sapwood area (A S_tree) based on available allometric data. To examine the errors in E that are generated when using the allometric equation with a small sample size, the Monte Carlo sampling technique was used with an original allometric data set. In this study, all trees (921 Cryptomeria japonica and 1226 Chamaecyparis obtusa) in the studied stands provided the original allometric data (DBH and A S_tree). Monte Carlo simulations allow the number of sample trees required for an appropriate E estimate to be derived. The results revealed that potential errors in the E estimate were almost stable with a sample size of over 20 for both Cr. japonica and Ch. obtusa. This implies that at least, but not more than, 20 trees are necessary for the allometric equation when estimating E for both species.

本文言語英語
ページ(範囲)191-195
ページ数5
ジャーナルForest Ecology and Management
206
1-3
DOI
出版ステータス出版済み - 2月 15 2005

!!!All Science Journal Classification (ASJC) codes

  • 林業
  • 自然保全および景観保全
  • マネジメント、モニタリング、政策と法律

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