Leaf/sapwood area ratios in Scots pine show acclimation across Europe

Mencuccini, Maurizio; Bonosi, Lorenzo

doi:10.1139/x00-173

Cited by 92 publications

(51 citation statements)

References 39 publications

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“…Our observations on HV at breast height were in line with the values reported for Scots pine from a range of various sites (Mencuccini and Bonosi 2001;Poyatos et al 2007) and were closer to drier sites (Martínez-Vilalta et al 2009). The HV values for the base of the crown and for branches were slightly higher than HV reported by Mencuccini and Grace (1994) and Mencuccini and Bonosi (2001). In trees of a different social status, the HV is a measure of their investment into the conductive pathways per unit of the leaf area fed by these pathways (Tyree and Ewers 1991).…”

Section: Individual Tree Levelsupporting

confidence: 90%

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Above- and below-ground biomass, surface and volume, and stored water in a mature Scots pine stand

2014

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This study describes the amount and the spatial distribution of the above-and below-ground tree skeletondefined as the woody structure of stem, branches and rootsin a mature Scots pine (Pinus sylvestris L.) stand in Belgium. Tree skeleton data were linked to the respective needle area, and as such, this work provides the background framework for modeling the tree hydraulic architecture and the carbon balance of the forest stand. Using validated allometric equations, we were able to calculate the amount of the volume, of the biomass and of the corresponding surface areas of individual trees in the stand. Total woody biomass of the 66-year-old forest stand was 155 Mg ha -1 , i.e., 126 Mg ha -1 above ground and 29 Mg ha -1 below ground. The total bio-volume of the woody mass of the stand was 314 m 3 ha -1 . The highest fraction of this value was the stem bio-volume, i.e., 236 m 3 ha -1 or 75 % of the total. The total volume of all roots was 57 m 3 ha -1 (18 % of the total volume), and the volume of branches was 20 m 3 ha -1 (7 % of the total volume). The surface area of the roots ranged from 38,000 m 2 ha -1 in the winter to 68,000 m 2 ha -1 in the spring. The surface area of the stems was 2,700 m 2 ha -1 , and the surface area of all branches reached 4,400 m 2 ha -1 . The total above-ground water storage in the xylem was 94 m 3 ha -1 (or 9.4 mm), while the accessible stored water was 2 mm of that quantity. A comparative analysis of the biometric parameters showed the balance between the different functionally connected, operational surface areas of the trees. The needle surface area was similar to the root surface area and in the same order of magnitude as the surface area of woody cambium. The results allow to link water uptake with transpiration and assimilation with respiration.

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Section: Individual Tree Levelsupporting

confidence: 90%

“…From the approach used in this contribution, the units of HV therefore were cm 2 kg -1 . Some authors (e.g., Mencuccini and Grace 1994; Mencuccini and Bonosi 2001;Sellin and Kupper 2006) prefer to express the Huber value as the needle area to the sapwood area ratio (m 2 cm -2 ). We therefore also calculated HV in this way.…”

Section: Huber Valuesmentioning

confidence: 99%

Above- and below-ground biomass, surface and volume, and stored water in a mature Scots pine stand

2014

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“…Using 3PG model to assess growth decline processes to forest decline (McDowell et al, 2008). On decline trees, values of stem partitioning ratio (pFS 20 ), maximum litterfall rate (γ Fx ), maximum canopy conductance (g Cx ), specific leaf area for mature aged stands (σ 1 ), age at which specific leaf area = ½ (σ 0 + σ 1 ), age at full canopy cover (t c ), and canopy boundary layer conductance (g B ) were different from those used on other simulations for pine species (Landsberg et al, 2005;Patenaude et al, 2008;van Oijen et al, 2013), and they were important for DBH and BAI predictions under drought stress (Esprey et al, 2004 for Black pine were within the lower range of those measured in England (Mencuccini & Bonosi, 2001;Patenaude et al, 2008). More restrictive physiological values (i.e., maximum canopy conductance (g Cx ) and canopy boundary layer conductance (g B ) affecting water photosynthetic status) led to a different biomass allocation to the stem or to foliage, resulting in lower DBH and BAI estimates.…”

Section: Sensitivity Analysis Of Silvicultural Treatmentsmentioning

confidence: 81%

Growth decline assessment in Pinus sylvestris L. and Pinus nigra Arnold. forest by using 3-PG model.

Navarro-Cerrillo¹,

Beira²,

Suárez

et al. 2016

For. syst.

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Aim of the study : We assessed the ability of the 3-PG process-based model to accurately predict growth of Pinus sylvestris and P. nigra plantations across a range of sites, showing declining growth trends, in southern Spain.Area of study: The study area is located in "Sierra de Los Filabres" (Almería). Material and methods:The model was modified in fifteen parameters to predict diameter (DBH, cm), basal area increment (BAI, cm 2 yr -1 ) and leaf area index (LAI, m 2 m -2 ) in healthy trees and trees showing declining growth. We assumed that a set of specific physiological parameters (stem partitioning ratio-pFS 20 , maximum litterfall rate-γ Fx , maximum canopy conductance-g Cx , specific leaf area for mature aged stands-σ 1 , age at which specific leaf area = ½ (σ 0 + σ 1 ), age at full canopy cover-t c , and canopy boundary layer conductance-g B ) included in 3-PG would be suitable for predicting growth decline related to climate conditions. The calibrated model was evaluated using dendrochronological and LAI data obtained from plots.Main results: Observed and simulated DBH showed a high correlation (R 2 > 0.99) between modelled and measured values for both species. In contrast, modelled and observed BAI showed lower correlation (R 2 < 0.68). Sensitivity analysis on 3-PG outputs showed that the foliage parameters -maximum litterfall rate, maximum canopy conductance, specific leaf area for mature aged stands, age at which specific leaf area, and age at full canopy cover -were important for DBH and BAI predictions under drought stress.Research highlights: Our overall results indicated that the 3-PG model could predict growth response of pine plantations to climatic stress with desirable accuracy in southern Spain by using readily available soil and climatic data with physiological parameters derived from experiments.

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“…Second, the low A l : A s values of our spruce trees may be associated with climate conditions that are drier and warmer than that of Colorado or Oregon. Climate has been shown to alter A l : A s ratios in Pinus sylvestris in sites that differ in water availability (Mencuccini and Grace, 1995), latitude (Mencuccini and Bonosi, 2001) or region (Poyatos et al, 2007).…”

Section: Allometic Resultsmentioning

confidence: 99%

Transpiration and stomatal conductance across a steep climate gradient in the southern Rocky Mountains

2008

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Transpiration (E) is regulated over short time periods by stomatal conductance (G s ) and over multi-year periods by treeand stand-structural factors such as leaf area, height and density, with upper limits ultimately set by climate. We tested the hypothesis that tree structure, stand structure and G s together regulate E per ground area (E g ) within climatic limits using three sites located across a steep climatic gradient: a low-elevation Juniperus woodland, a mid-elevation Pinus forest and a high-elevation Picea forest. We measured leaf area : sapwood area ratio (A l : A s ), height and ecosystem sapwood area : ground area ratio (A s : A g ) to assess long-term structural adjustments, tree-ring carbon isotope ratios (υ 13 C) to assess seasonal gas exchange, and whole-tree E and G s to assess short-term regulation. We used a hydraulic model based on Darcy's law to interpret the interactive regulation of G s and E g . Common allometric dependencies were found only in the relationship of sapwood area to diameter for pine and spruce; there were strong site differences for allometric relationships of sapwood area to basal area, A l : A s and A s : A g . On a sapwood area basis, E decreased with increasing elevation, but this pattern was reversed when E was scaled to the crown using A l : A s . E g was controlled largely by A s : A g , and both E g and G s declined from high-to low-elevation sites. Observation-model comparisons of E g , G s and υ 13 C were strongest using the hydraulic model parameterized with precipitation, vapour pressure deficit, A l : A s , height, and A s : A g , supporting the concept that climate, G s , tree-and stand-structure interact to regulate E g .

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Leaf/sapwood area ratios in Scots pine show acclimation across Europe

Cited by 92 publications

References 39 publications

Above- and below-ground biomass, surface and volume, and stored water in a mature Scots pine stand

Above- and below-ground biomass, surface and volume, and stored water in a mature Scots pine stand

Growth decline assessment in Pinus sylvestris L. and Pinus nigra Arnold. forest by using 3-PG model.

Transpiration and stomatal conductance across a steep climate gradient in the southern Rocky Mountains

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