Title

Bias in Leaf Area -- Sapwood Area Ratios and Its Impact on Growth Analysis in Lodgepole Pine

Authors

T J. Dean

Document Type

Article

Journal/Book Title/Conference

Trees - Structure and Function

Publication Date

1988

Volume

2

Issue

2

Abstract

Two alternative estimators of individual tree leaf area (A1) area are used to derive estimates of leaf-area index (L) for 40 plots in Pinus contorta Dougl. stands. One estimator of A1 is based on the common assumption of a constant ratio between A1 and sapwood cross-sectional area at breast height (As). The second estimator of A1 accounts for tree-to-tree variation in the relation between A1 and As. The apparent relationship between stand growth and leaf-area index is strongly dependent on the way leaf area is estimated. When L is derived from a constant A1ratioAs ratio, stand growth appears to be strongly correlated with L. However, when L is based on estmates of A1 that account for tree-to-tree variation in the A1 — As relation, stand growth is seen to be only weakly related to L. Stand structure, quantified as percent live-crown, accounts for a great deal of the observed variation in leaf-area efficiency. These contrasting relationships illustrate the importance of unbiased estimates of L in interpreting the link between stand-level processes and leaf area.

Comments

Originally published by Springer Verlag. Abstract and limited preview available through remote link. Subscription required to access article fulltext.

First Page

104

Last Page

109

DOI

10.1007/BF00196756