Stand sapwood basal area : an indicator of tree vigor Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/rb68xf79p

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  • The control that stand leaf area exerts upon individual tree vigor was tested on a heterogeneous, even-aged Douglas-fir stand infected by Phellinus root rot. Tree vigor, or growth efficiency ratio, was defined as the current basal area growth per unit of leaf area. Because of a close relationship between sapwood basal area and tree leaf area, stand sapwood basal area was used as an indirect estimator of competing leaf area to test changes in growth efficiency at different levels of canopy density. It was hypothesized that the growth efficiency ratio would decrease linearly with increasing stand sapwood basal area. No significant relationships were found between stand sapwood basal area and either average or individual tree growth efficiency. However, the maximum efficiency of trees recorded under specified levels of canopy competition (upper boundary) did follow the expected trends. No significant difference was found between the slope of the upper boundary linear equation and the slope of the line which described the relationship between mean growth efficiency and stand sapwood basal area in another homogeneous stand in the Oregon Coastal Range. Several explanations for the lack of the general hypothesized relationship were offered, including the need for more refined measurement methods of sapwood basal area and basal area growth. Still, the most reasonable explanation is that root rot continued to reduce growth below the potential and induced unmeasured continuous changes in the canopy which affected individual tree response differently.
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