Comparison of Methods of Estimating Leaf‐Area Index In Old‐Growth Douglas‐Fir
1986
Marshall, J. D. | Waring, R. H.
Leaf—area index (LAI, the projected total surface area of foliage per unit ground area) of an old—growth Douglas—fir stand in western Oregon was estimated from litterfall, light interception, sapwood cross—sectional area, and tree diameter. Estimates made by the first three techniques were similar, but the estimate based on tree diameter was twice as high as the others. For large trees with variable amounts of live crown, estimates of leaf area based on tree diameter appear to be inaccurate; therefore, the exceedingly high leaf—area indices previously reported for Douglas—fir forests are unreliable. Sapwood cross—sectional area varies in correspondence with the canopy area and therefore is a better estimator of leaf area on large trees. Maximum LAI estimates based on sapwood area are similar to those for other temperate coniferous forests.
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