scholarly journals Morphological and moisture availability controls of the leaf area‐to‐sapwood area ratio: analysis of measurements on A ustralian trees

2015 ◽  
Vol 5 (6) ◽  
pp. 1263-1270 ◽  
Author(s):  
Henrique Furstenau Togashi ◽  
Iain Colin Prentice ◽  
Bradley John Evans ◽  
David Ian Forrester ◽  
Paul Drake ◽  
...  
Keyword(s):  
Leaf Area ◽  
Area Ratio ◽  
Ratio Analysis ◽  
Sapwood Area ◽  
Moisture Availability

Climate influences the leaf area/sapwood area ratio in Scots pine

1995 ◽  
Vol 15 (1) ◽  
pp. 1-10 ◽  
Author(s):  
M. Mencuccini ◽  
J. Grace
Keyword(s):  
Leaf Area ◽  
Scots Pine ◽  
Area Ratio ◽  
Sapwood Area ◽  
Climate Influences

The relationship between tree height and leaf area: sapwood area ratio

Oecologia ◽  
2002 ◽  
Vol 132 (1) ◽  
pp. 12-20 ◽  
Author(s):  
N. McDowell ◽  
H. Barnard ◽  
B. Bond ◽  
T. Hinckley ◽  
R. Hubbard ◽  
...  
Keyword(s):  
Leaf Area ◽  
Tree Height ◽  
Area Ratio ◽  
Sapwood Area ◽  
The Relationship

scholarly journals Restoration thinning and influence of tree size and leaf area to sapwood area ratio on water relations of Pinus ponderosa

2006 ◽  
Vol 26 (4) ◽  
pp. 493-503 ◽  
Author(s):  
K. Simonin ◽  
T. E. Kolb ◽  
M. Montes-Helu ◽  
G. W. Koch
Keyword(s):  
Leaf Area ◽  
Water Relations ◽  
Pinus Ponderosa ◽  
Area Ratio ◽  
Tree Size ◽  
Sapwood Area

The influence of thinning and tree size on the sapwood area / leaf area ratio in coigue

2005 ◽  
Vol 35 (7) ◽  
pp. 1679-1685 ◽  
Author(s):  
Pablo A Gajardo-Caviedes ◽  
Miguel A Espinosa ◽  
Urcesino del T González ◽  
Darcy G Ríos
Keyword(s):  
Leaf Area ◽  
Specific Leaf Area ◽  
Regression Models ◽  
Area Ratio ◽  
Destructive Sampling ◽  
Cross Sectional ◽  
Sapwood Area ◽  
Nothofagus Dombeyi ◽  
The Relationship ◽  
Best Fit

The effect of thinning and crown class on the projected leaf area, specific leaf area, and projected leaf area / sapwood area ratio was evaluated in a 48-year-old even-aged stand of coigue (Nothofagus dombeyi (Mirb.) Oerst.). The data were collected through destructive sampling of 27 trees and analyzed with analysis of variance and regression models. The projected leaf area was greater in trees from more intensely thinned stands. The specific leaf area and the projected leaf area / sapwood area ratio did not vary between treatments. The sapwood cross-sectional area at breast height (1.3 m) and at the base of the live crown provided the best fit for the relationship between projected leaf area and sapwood area. The current sapwood area provided the worst fit, suggesting that at an early age, coigue sapwood does not present permeability problems associated with tyloses.

A leaf area – sapwood area ratio developed to rate loblolly pine tree vigor

1985 ◽  
Vol 15 (6) ◽  
pp. 1181-1184 ◽  
Author(s):  
C. A. Blanche ◽  
J. D. Hodges ◽  
T. E. Nebeker
Keyword(s):  
Leaf Area ◽  
Loblolly Pine ◽  
Dry Weight ◽  
Area Ratio ◽  
Cross Sectional ◽  
Sapwood Area ◽  
Breast Height ◽  
Pine Tree ◽  
Individual Trees ◽  
The Relationship

Stem cross-sectional sapwood area was linearly related to leaf area in loblolly pine. A better relationship was obtained using cross-sectional sapwood area taken at crown base than at breast height. The relationship was affected by time of sampling, with time of maximum needle biomass giving the best correlation. Specific leaf area (area in square centimetres per gram dry weight) was variable, but the mean of 95.32 cm2/g is comparable to reported values for other species. The leaf area – sapwood area ratio at breast height varies only slightly among individual trees so that a mean ratio of 0.29 can be utilized to accurately predict leaf area. The ratio between curent-year or previous-year sapwood production and leaf area (grams per square metre of foliage) was used as an indicator of tree vigor. Tree vigor values varied greatly (21 – 180 g/m2), but were normally distributed within this range.

Relationships between stem diameter, sapwood area, leaf area and transpiration in a young mountain ash forest

1995 ◽  
Vol 15 (9) ◽  
pp. 559-567 ◽  
Author(s):  
R. A. Vertessy ◽  
R. G. Benyon ◽  
S. K. O'Sullivan ◽  
P. R. Gribben
Keyword(s):  
Leaf Area ◽  
Stem Diameter ◽  
Sapwood Area ◽  
Mountain Ash

Characterizing the light environment in Sierra Nevada mixed-conifer forests using a spatially explicit light model

2004 ◽  
Vol 34 (6) ◽  
pp. 1332-1342 ◽  
Author(s):  
Rolf Gersonde ◽  
John J Battles ◽  
Kevin L O'Hara
Keyword(s):  
Leaf Area ◽  
Sierra Nevada ◽  
Forest Type ◽  
Individual Species ◽  
Spatially Explicit ◽  
Conifer Forests ◽  
Prediction Equations ◽  
Mixed Conifer ◽  
Sapwood Area ◽  
Mixed Conifer Forests

The spatially explicit light model tRAYci was calibrated to conditions in multi-aged Sierra Nevada mixed-conifer forests. To reflect conditions that are important to growth and regeneration of this forest type, we sampled a variety of managed mature stands with multiple canopy layers and cohorts. Calibration of the light model included determining leaf area density for individual species with the use of leaf area – sapwood area prediction equations. Prediction equations differed between species and could be improved using site index. The light model predicted point measurements from hemispherical photographs well over a range of 27%–63% light. Simplifying the crown representation in the tRAYci model to average values for species and canopy strata resulted in little reduction in model performance and makes the model more useful to applications with lower sampling intensity. Vertical light profiles in managed mixed-conifer stands could be divided into homogeneous, sigmiodal, and continuous gradients, depending on stand structure and foliage distribution. Concentration of leaf area in the upper canopy concentrates light resources on dominant trees in continuous canopies. Irregular canopies of multiaged stands, however, provide more light resources to mid-size trees and could support growth of shade-intolerant species. Knowledge of the vertical distribution of light intensity in connection with stand structural information can guide regulation of irregular stand structures to meet forest management objectives.

The effect of local stand structure on growth and growth efficiency in heterogeneous stands of ponderosa pine and lodgepole pine in central Oregon

2004 ◽  
Vol 34 (11) ◽  
pp. 2217-2229 ◽  
Author(s):  
Douglas B Mainwaring ◽  
Douglas A Maguire
Keyword(s):  
Leaf Area ◽  
Ponderosa Pine ◽  
Lodgepole Pine ◽  
Volume Growth ◽  
Basal Area ◽  
Growth Efficiency ◽  
Projection Area ◽  
Sapwood Area ◽  
Negative Effect ◽  
Crown Projection Area

Basal area and height growth were analyzed for individual trees in uneven-aged ponderosa pine (Pinus ponderosa Dougl. ex Laws.) and lodgepole pine (Pinus contorta Dougl. ex. Loud.) stands in central Oregon. Basal area growth was modeled as a function of other stand and tree variables to address three general objectives: (1) to compare the predictive ability of distance-dependent versus distance-independent stand density variables; (2) to determine the degree to which small trees negatively affect the growth of overstory trees; and (3) to test for differences in growth efficiency between species and between indices of spatial occupancy used to define efficiency (area potentially available, crown projection area, and a surrogate for total tree leaf area). Distance-dependent variables were found to improve growth predictions when added to models with only distance-independent variables, and small trees were found to have a quantifiably negative effect on the growth of larger trees. While volume growth efficiency declined with increasing levels of spatial occupancy for lodgepole pine, ponderosa pine volume growth efficiency was greatest at the highest levels of crown base sapwood area and crown projection area. The behavior in ponderosa pine resulted from the previously recognized correlation between tree height and total leaf area or crown size. The final statistical models distinguished between the positive effect of relative height and the negative effect of increasing tree size.

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