The effects of site, stand density, and sapwood permeability on the relationship between leaf area and sapwood area in loblolly pine (Pinus taeda L.)

The relationship between total leaf area (LA) and sapwood area (SA) was studied in four stands of approximately 30-year-old loblolly pine (Pinus taeda L.) representing extremes of stand basal area and site index. Nine trees (three dominant, three intermediate, and three suppressed) were randomly sel...

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Bibliographic Details
Published in:Forest ecology and management 1993-05, Vol.58 (3-4), p.193-209
Main Authors: Shelburne, V.B. (Clemson Univ., Clemson, SC (USA). Dept. of Forest Resources), Hedden, R.L, Allen, R.M
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
ALBURA
AUBIER
Biological and medical sciences
CARACTERISTICAS DEL SITIO
Dendrometry. Forest inventory
FACTEUR LIE AU SITE
Forestry
Fundamental and applied biological sciences. Psychology
LEAF AREA
PERMEABILIDAD
PERMEABILITE
PERMEABILITY
PINUS TAEDA
PLANT POPULATION
POBLACION VEGETAL
POPULATION VEGETALE
SAPWOOD
SITE FACTORS
SUPERFICIE FOLIAR
SURFACE FOLIAIRE
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Summary:The relationship between total leaf area (LA) and sapwood area (SA) was studied in four stands of approximately 30-year-old loblolly pine (Pinus taeda L.) representing extremes of stand basal area and site index. Nine trees (three dominant, three intermediate, and three suppressed) were randomly selected from each stand for determination of LA and SA. Sapwood permeability with respect to height in stem and radial distance from the pith was determined from one other tree from each dominance class in each stand. Stem cross-sectional SA at breast height, mid-stem and base of live crown were linearly related to LA. SA at the base of live crown was a better predictor of LA on some sites than SA at breast height. The effect of including sapwood permeability (average sapwood permeability x area of sapwood) in the LA prediction equations was minimal. Regression equations for LA had different slopes between basal area classes but not between sites. Because of the larger regression slope of the LA prediction from SA in the low basal area stands (more leaf area per unit of sapwood), it is hypothesized that carbohydrate production in low basal area stands is allocated proportionally more to leaf or root tissue than sapwood at breast height and mid-stem. This implies that leaf area is the controlling factor in the LA-SA relationship.
ISSN:0378-1127
1872-7042
DOI:10.1016/0378-1127(93)90145-D