Estimation of crown volume for a geometric radiation model from detailed measurements of tree structure

Mõttus, Matti; Sulev, Madis; Lang, Mait

doi:10.1016/j.ecolmodel.2006.05.033

Cited by 33 publications

(13 citation statements)

References 50 publications

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“…The LAI is defined as the cumulative one-sided area of leaves per unit stand area and is expressed in m 2 per m 2 [9,10]. The same applies for the surface area of woody plant compartments, the woody area index (WAI) and the sum of LAI and WAI, the plant area index (PAI).…”

Section: Introductionmentioning

confidence: 99%

“…Research results were commonly reported at the spatial scale of groups of trees or forest stands [18,19]. However, some studies indicated horizontal variability of LAI within the crown of single trees in orchards, olive-and nut plantations, as well as in forest ecosystems for juvenile alder and beech [9,[20][21][22][23][24] and strong spatial autocorrelations in point-scale LAI measurements with a range between ten and 15 m, which equals average crown dimensions [25,26].…”

Section: Introductionmentioning

confidence: 99%

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Small Scale Rainfall Partitioning in a European Beech Forest Ecosystem Reveals Heterogeneity of Leaf Area Index and Its Connectivity to Hydro-and Atmosphere

et al. 2019

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(1) Background: Leaf area index (LAI) is an essential structural property of plant canopies and is functionally related to fluxes of energy, water, carbon, and light in ecosystems; coupling the biosphere to the geo-, hydro-, and atmosphere. There is an increasing need for more accurate and traceable measurements among several spatial scales of investigation and modelling. We hypothesize that the spatial variability of LAI at the scale of crown sections of a single European beech (Fagus sylvatica L.) tree in a highly structured, mixed European beech-Norway spruce stand can be determined by simultaneous records of precipitation; (2) Methods: Spatially explicit measurements of throughfall were conducted repeatedly below beech and in forest gaps for rain events in leafed and in leafless periods. Subsequent analysis with a new regression approach resulted in estimating leaf and twig water storage capacities (SCleaf/twig) at point level independent of within-crown lateral flow mechanisms. Inverse modelling was used to estimate spatial litterfall (n = 99) distribution and litter production (mass, area, numbers) for single trees, as a function of diameter at breast height; (3) Results: As revealed by a linear mixed-effects model, SCleaf at the center of a beech canopies amounts to 4.9 mm in average and significantly decreases in the direction of the crown edges to an average value of 1.1 mm. Based on diameter-sensitive prediction of litter production, specific leaf area wetting capacity amounts to 0.260 l·m−2. A linear within-canopy dynamic of LAI was found with a mean of 17.6 m2·m−2 in the center and 4.0 m2·m−2 at the edges; and (4) Conclusions: The application of the method provided plausible results and can be extended to further throughfall datasets and tree species. Unravelling the causes and magnitude of spatial- and temporal heterogeneity of forest ecosystem properties contribute to overall progress in geosciences by improving the understanding how the biosphere relates to the hydro- and atmosphere.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Small Scale Rainfall Partitioning in a European Beech Forest Ecosystem Reveals Heterogeneity of Leaf Area Index and Its Connectivity to Hydro-and Atmosphere

et al. 2019

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“…foliage densities (e.g. Bartelink 1998;Da Silva et al 2007) and foliage inclination angles (Stadt and Lieffers 2000), but only a few models (Mõttus et al 2006;Duursma et al 2011) actually linking the detailed species-specific crown architecture and light transmission have been introduced (Messier et al 1999). The few results have shown that species-specific variation in light transmission is closely correlated with the shade-tolerance and successional status of the species (Canham et al 1994;Messier et al 1998) and with the degree of foliage grouping between conifers and broadleaved species (Bartelink 1998;Messier et al 1998).…”

Section: Motivation For the Thesis And Study Aimsmentioning

confidence: 99%

Crown architecture and its role in species interactions in mixed boreal forests

Lintunen¹

2013

Diss. For.

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The species specific growth patterns make plastic crown architecture respond in different manner to different environments modifying their influence to neighbours. The main aims of this thesis were to separate the effect of neighbour species identity from the abundance, size and proximity of the neighbours in between-tree competition and to link crown architecture with hydraulic architecture by identifying the associated within-tree variation of crown traits.The empirical part of the work was based on digitising three-dimensional (3D) crown architecture and measuring xylem anatomy. Digitising allowed the development of crown architecture models for Betula pendula (Roth.) and Pinus sylvestris (L.). The models were further applied to simulate light transmission in mixed stands.Crown architecture of the studied species responded to increased competition intensity primarily by reducing branch number and size. Proportional biomass distribution to foliage and main branches over the stem increased in young B. pendula with increasing competition intensity, whereas Pinus sylvestris used the opposite strategy. In addition to competition intensity, crown architecture of the studied species showed plastic responses to the species identity of neighbouring trees. Lower overall growth but added height growth indicating stronger competition was found in mixtures of B. pendula and Pinus sylvestris when a tree was surrounded by interspecific neighbours compared to trees surrounded by intraspecific neighbours. Both species-specific effects on resource gradients and nonresource signals remain plausible explanations for this result: B. pendula transmitted more light than Pinus sylvestris at simulated dense stands.Hydraulic architecture was shown to be interlinked with crown architecture as the conduit diameter varied as a function of tree compartment, branching hierarchy, leaf area and distance from the apex.The results suggest that the use of detailed tree structure models and species-specific competition analysis is useful in predicting and understanding growth in mixed boreal stands.

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“…The greater presence of Carnegiea under the south of their nurses' canopy has been explained by empirical data that show that minimum winter temperatures are significantly warmer to the south of the nurse than to the north Garrity 2003, Drezner 2007). Canopy structure (e.g., Mottus et al 2006), however, has not been considered.…”

Section: ]mentioning

confidence: 97%

Nurse tree canopy shape, the subcanopy distribution of cacti, and facilitation in the Sonoran Desert

Drezner

2010

The Journal of the Torrey Botanical Society

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Estimation of crown volume for a geometric radiation model from detailed measurements of tree structure

Cited by 33 publications

References 50 publications

Small Scale Rainfall Partitioning in a European Beech Forest Ecosystem Reveals Heterogeneity of Leaf Area Index and Its Connectivity to Hydro-and Atmosphere

Small Scale Rainfall Partitioning in a European Beech Forest Ecosystem Reveals Heterogeneity of Leaf Area Index and Its Connectivity to Hydro-and Atmosphere

Crown architecture and its role in species interactions in mixed boreal forests

Nurse tree canopy shape, the subcanopy distribution of cacti, and facilitation in the Sonoran Desert

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