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

Research output: Contribution to journalArticle

65 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)110-116
Number of pages7
JournalAgricultural and Forest Meteorology
Volume135
Issue number1-4
DOIs
Publication statusPublished - Dec 14 2005

Fingerprint

sap flow
Cryptomeria japonica
transpiration
effect
sampling
sapwood
sap
uncertainty
sensor

All Science Journal Classification (ASJC) codes

  • Forestry
  • Atmospheric Science

Cite this

Effects of tree-to-tree and radial variations on sap flow estimates of transpiration in Japanese cedar. / Kumagai, Tomo'omi; Aoki, Sayaka; Nagasawa, Hisami; Mabuchi, Tetsuya; Kubota, Katsuyoshi; Inoue, Sachiko; Utsumi, Yasuhiro; Otsuki, Kyoichi.

In: Agricultural and Forest Meteorology, Vol. 135, No. 1-4, 14.12.2005, p. 110-116.

Research output: Contribution to journalArticle

Kumagai, Tomo'omi ; Aoki, Sayaka ; Nagasawa, Hisami ; Mabuchi, Tetsuya ; Kubota, Katsuyoshi ; Inoue, Sachiko ; Utsumi, Yasuhiro ; Otsuki, Kyoichi. / Effects of tree-to-tree and radial variations on sap flow estimates of transpiration in Japanese cedar. In: Agricultural and Forest Meteorology. 2005 ; Vol. 135, No. 1-4. pp. 110-116.
@article{e89b85c0eaa4429fba64d0515ab1a1a5,
title = "Effects of tree-to-tree and radial variations on sap flow estimates of transpiration in Japanese cedar",
abstract = "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.",
author = "Tomo'omi Kumagai and Sayaka Aoki and Hisami Nagasawa and Tetsuya Mabuchi and Katsuyoshi Kubota and Sachiko Inoue and Yasuhiro Utsumi and Kyoichi Otsuki",
year = "2005",
month = "12",
day = "14",
doi = "10.1016/j.agrformet.2005.11.007",
language = "English",
volume = "135",
pages = "110--116",
journal = "Agricultural and Forest Meteorology",
issn = "0168-1923",
publisher = "Elsevier",
number = "1-4",

}

TY - JOUR

T1 - Effects of tree-to-tree and radial variations on sap flow estimates of transpiration in Japanese cedar

AU - Kumagai, Tomo'omi

AU - Aoki, Sayaka

AU - Nagasawa, Hisami

AU - Mabuchi, Tetsuya

AU - Kubota, Katsuyoshi

AU - Inoue, Sachiko

AU - Utsumi, Yasuhiro

AU - Otsuki, Kyoichi

PY - 2005/12/14

Y1 - 2005/12/14

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=33144469664&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33144469664&partnerID=8YFLogxK

U2 - 10.1016/j.agrformet.2005.11.007

DO - 10.1016/j.agrformet.2005.11.007

M3 - Article

AN - SCOPUS:33144469664

VL - 135

SP - 110

EP - 116

JO - Agricultural and Forest Meteorology

JF - Agricultural and Forest Meteorology

SN - 0168-1923

IS - 1-4

ER -