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Ground-Based Estimation of Leaf Area Index and Vertical Distribution of Leaf Area Density in a Betula ermanii Forest

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Title: Ground-Based Estimation of Leaf Area Index and Vertical Distribution of Leaf Area Density in a Betula ermanii Forest
Authors: Sumida, Akihiro Browse this author →KAKEN DB
Nakai, Taro Browse this author
Yamada, Masahito Browse this author
Ono, Kiyomi Browse this author →KAKEN DB
Uemura, Shigeru Browse this author →KAKEN DB
Hara, Toshihiko Browse this author →KAKEN DB
Keywords: leaf area density
leaf inclination angle
MacArthur–Horn method
pipe model
Betula ermanii
Issue Date: 2009
Publisher: Finnish Society of Forest Science
Journal Title: Silva Fennica
Volume: 43
Issue: 5
Start Page: 799
End Page: 816
Abstract: We developed a ground-based method for estimating leaf area index (LAI) and vertical distribution of leaf area density (LAD) for two Betula ermanii plots, combining an allometric method for tree leaf area with the MacArthur–Horn (MH) method using a portable laser rangefinder, including a correction for changes in leaf inclination angle along the vertical gradient measured with a portable digital protractor from a canopy access tower in each plot. Vertical distribution of projected leaf area density obtained by the MH method (LADMH) was transformed to relative distribution for allotting fixed LAI to different heights. Hence, we first developed an allometric method for estimating tree leaf area for LAI determination. Trunk cross-sectional area at branching height (AB) was accurately estimated (r2 = 0.97) from ground-based measurements of tree dimensions. We used this method to apply pipe model allometry between tree leaf area and AB, and estimated LAI (4.56 and 4.57 m2 m–2). We then examined how leaf inclination angle affected estimation of the vertical distribution of actual LAD. Leaf inclination angle measurements revealed that actual LAD in the upper canopy was 1.5–1.8-times higher than LADMH, because of steep leaf inclination, while the correction factor was 1.15–1.25 in the lower canopy. Due to the difference among heights, vertical distribution of LAD estimated with correction for vertical change in leaf inclination was more skewed to the upper canopy than that without correction. We also showed that error in LAD distribution can result if horizontal canopy heterogeneity is neglected when applying the MH method.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 隅田 明洋

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