A comparison of optical and direct methods for monitoring the seasonal dynamics of leaf area index in deciduous forests

Mussche, Sylvie; Samson, Roeland; Nachtergale, Lieven; Schrijver, An De; Lemeur, Raoul; Lust, Noël

doi:10.14214/sf.575

Cited by 57 publications

(44 citation statements)

References 25 publications

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“…Litter traps are often used for validating new methods (e.g. McIntyre et al 1990;Thimonier et al 2010) and are assigned to the direct methods even though they are not destructive (Sampson and Allen 1995;Mussche et al 2001;Jonckheere et al 2004). However, litter traps are clearly different from the other direct approaches.…”

Section: Litter Trapsmentioning

confidence: 99%

“…An example would be the litter traps. The method is well established and is used for the validation of other methods (Mussche et al 2001). The accuracy is therefore regarded to be high, but the resolution of the method is rather low as there is no information for a certain tree or branch that could be extracted.…”

Section: Accuracy and Resolutionmentioning

confidence: 99%

“…The accuracy is therefore regarded to be high, but the resolution of the method is rather low as there is no information for a certain tree or branch that could be extracted. As all direct methods are of high accuracy, the indirect methods can only be evaluated using direct methods for validation (Fukushima et al 1998;Arthur et al 2000;Mussche et al 2001). Their direct character may be laborious (Aber 1979), but it is the only way to gain reliable validation data.…”

Section: Accuracy and Resolutionmentioning

confidence: 99%

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Review of ground-based methods to measure the distribution of biomass in forest canopies

Seidel

Fleck

Leuschner

et al. 2011

Annals of Forest Science

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& Context Ecological research and an effective forest management need accurate information on the structure of the forest canopy to understand the biochemical, physiological and biogeochemical processes within a forest. & Research question This paper reviews the currently available instruments for measuring the distribution of biomass within forest canopies. We compare the most well-established approaches and present the different measurable parameters. A special focus lies on the resolution of the obtained data. & Results It was found that only 3D laser scanners offer data with the resolution required by ecologists, private landholders, the forest industry and the public to detect trends in tree growth patterns and canopy interactions in all three spatial dimensions. But data validation, data analysis and parameter extraction are still under development, and the price of the instrument is quite high. & Conclusion Research should focus on the parameter extraction from terrestrial laser scanner data as this could allow the calculation of functional attributes for different sections of a canopy on a high spatial resolution. It could also help ecologists characterize the structure of forest stands in a quick and precise way.

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Section: Litter Trapsmentioning

confidence: 99%

Section: Accuracy and Resolutionmentioning

confidence: 99%

Section: Accuracy and Resolutionmentioning

confidence: 99%

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Review of ground-based methods to measure the distribution of biomass in forest canopies

Seidel

Fleck

Leuschner

et al. 2011

Annals of Forest Science

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“…Dit stemt overeen met een berekende Leaf Area Index (LAI) van ongeveer 7. Ter vergelijking: in een elzenbroekbos en een essenbos werd op dezelfde wijze een waarde gemeten van 4,5 (Eschenbach & Kappen 1996;Mussche et al 2001). De waarden liggen meer in de buurt van beukenbestanden, waar een uitdoving van de relatieve instraling van 99,1% gemeten werd (Cutini et al 1998) en LAI waarden tot 6,9 (Thimonier et al 2010).…”

Section: Tellingen Van Kiemplanten En Bloeiende Bosplantenunclassified

Kennisopbouw rond efficiëntie van beheertechnieken voor lichtminnende soorten binnen bos: Voortgangsrapport 2016 : bespreking van een aantal specifieke veldexperimenten

Keersmaeker¹,

Thomaes²,

Aa³

et al. 2017

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“…In turn, the seasonal cycle of leaf development determines many crucial aspects of forest canopy function, including photosynthetic uptake, radiation extinction, rainfall interception, and evapotranspiration (Bonan 1993, Saigusa et al 2002. Foliage development, assessed at the stand level in terms of the leaf area index (LAI), typically increases rapidly in western European deciduous forests, from early May to mid-July, with the maximum around midJuly (Mussche et al 2001). LAI affects the transmittance of photosynthetically active radiation (PAR) to the understory.…”

mentioning

confidence: 99%

Links between phenology and ecophysiology in a European beech forest

Urban¹,

Bednářová²,

Plichta³

et al. 2015

iForest

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© iForest -Biogeosciences and Forestry IntroductionAt scales ranging from organ to ecosystem, many processes, particularly those related to carbon cycling (productivity and growth), water (evapotranspiration and runoff), and nutrients (decomposition and mineralization), are directly mediated by phenology (Gu et al. 2003). Spring bud burst provides a particularly good example, as it involves various interactions between trees and the environment. The initiation of this phenological phase depends on early spring air and soil temperatures (Menzel 2000, Lupi et al. 2012 as well as other environmental attributes such as photoperiod (Wareing 1953, Basler & Körner 2012, precipitation and tree health. In turn, the seasonal cycle of leaf development determines many crucial aspects of forest canopy function, including photosynthetic uptake, radiation extinction, rainfall interception, and evapotranspiration (Bonan 1993, Saigusa et al. 2002. Foliage development, assessed at the stand level in terms of the leaf area index (LAI), typically increases rapidly in western European deciduous forests, from early May to mid-July, with the maximum around midJuly (Mussche et al. 2001). LAI affects the transmittance of photosynthetically active radiation (PAR) to the understory. Additionally, leaf development yields increases in transpiration (Střelcová et al. 2006).Tree phenology is dependent on the plant's storage and consumption of carbohydrates (Michelot et al. 2012). These are stored in all organs (i.e., leaves, branches, roots, and stems) in different concentrations, which can vary during the growing season based on the relative rates of production and use (Scartazza et al. 2013). New photoassimilates transported in phloem sap may be used for radial growth, with leaf phenology (i.e., budburst, leaf development and yellowing) thus influencing intra-annual wood formation (Čufar et al. 2008, Sass-Klaassen et al. 2011. The time lags between leaf and xylem growth phenologies vary among species, leading to differences in relative carbon allocation. In deciduous species, budburst generally occurs following radial growth for ring-porous species, whereas for diffuse-porous species, cambial division and consequent radial growth are initiated at almost the same time as budburst (Suzuki et al. 1996, Schmitt et al. 2000, Čufar et al. 2008. Nevertheless, even in diffuse-porous species, onset of cambial activity is sustained to a large degree by carbon accumulated in storage pools (Dietze et al. 2014).Given sufficient soil water and based on atmospheric evaporative demand, maximal transpiration rates occur when trees have full foliage (Meier & Leuschner 2008). However, numerous laboratory experiments on herbaceous plants and tree seedlings or saplings have shown that leaf coloring and leaf area reduction (i.e., events marking onset of particular phenological stages) are common responses to soil water shortage (Löf & Welander 2000). Loss of leaves results in a decrease of the transpiring surface area, avoiding a severe reduction of cell water p...

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A comparison of optical and direct methods for monitoring the seasonal dynamics of leaf area index in deciduous forests

Cited by 57 publications

References 25 publications

Review of ground-based methods to measure the distribution of biomass in forest canopies

Review of ground-based methods to measure the distribution of biomass in forest canopies

Kennisopbouw rond efficiëntie van beheertechnieken voor lichtminnende soorten binnen bos: Voortgangsrapport 2016 : bespreking van een aantal specifieke veldexperimenten

Links between phenology and ecophysiology in a European beech forest

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