Calibration of LAI-2000 to estimate leaf area index (LAI) and assessment of its relationship with stand productivity in six native and introduced tree species in Costa Rica

Arias‐Aguilar, Dagoberto; Calvo–Alvarado, Julio; Dohrenbusch, A.

doi:10.1016/j.foreco.2007.04.039

Cited by 63 publications

(33 citation statements)

References 40 publications

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“…In most of the previous studies, the correlation between the leaf area and the diameter at breast height was investigated (López-Serrano et al 2000;Turner et al 2000;Law et al 2001;Adl 2007;Arias et al 2007;Pokorný, Tomášková 2007;Calvo-Alvarado et al 2008;Babaei-Kafaki et al 2009), and less attention was devoted to the tree's crown-related parameters (Laubhann et al 2010;Vyas et al 2010). But, with the consideration of specific conditions of our investigated area, which is under traditional management, besides investigating other parameters, we also directed our attention to the crown-related parameters, particularly the crown volume.…”

Section: Resultsmentioning

confidence: 99%

“…It is difficult to use direct methods, including harvesting, allometry and litter collection (Bréda 2003). Then, to obtain the LAI of a stand, a destructive sampling should be done through harvesting the total leaf biomass of the trees to generate the total dry weight of the foliage (Arias et al 2007). On the other hand, indirect methods, in which leaf area (LA) is inferred from observations of another variable, are generally faster and amendable to automation, and thereby allow for a larger spatial sample to be obtained .…”

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confidence: 99%

“…Another important aspect of tree researches is the task of figuring out an appropriate allometric relationship between LA and other biophysical parameters of trees such as diameter at breast height (DBH), tree height, crown surface area, and litter mass (Vyas et al 2010 can be used to estimate LAI by having the specific leaf area (SLA) (Gower et al 1999). Many studies have shown a relationship between LAI and these parameters for different species (López-Serrano et al 2000;Turner et al 2000;Tobin et al 2006;Arias et al 2007;Pokorný, Tomášková 2007;Vyas et al 2010). However, allometric equations have rarely been investigated in oak forests so far (Čermák et al 2008;Babaei-Kafaki et al 2009).…”

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confidence: 99%

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Estimation of leaf area index and assessment of its allometric equations in oak forests: Northern Zagros, Iran

Khosravi¹,

Namiranian²,

Ghazanfari³

et al. 2012

J. For. Sci.

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AbStrAct:The focus of the present study is the estimation of leaf area index (LAI) and the assessment of allometric equations for predicting the leaf area of Lebanon oaks (Quercus libani Oliv.) in Iran's northern Zagros forests. To that end, 50 oak trees were randomly selected and their biophysical parameters were measured. Then, on the basis of destructive sampling of the oak trees, their specific leaf area (SLA) and leaf area were measured. The results showed that SLA and LAI of the Lebanon oaks were 136.9 cm·g -1 and 1.99, respectively. Among all the parameters we measured, the crown volume exhibited the highest correlation with LAI (r 2 = 0.65). The easily measured tree parameters such as diameter at breast height did not show a high correlation with leaf area (r 2 = 0.36). Our obtained moderate correlations in the allometric equations could be due to the fact that branches of these trees had been pollarded by the local people when the branches were only 3 or 4 years old; therefore, the natural structure of the crowns in these trees might have been damaged.

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Section: Resultsmentioning

confidence: 99%

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Estimation of leaf area index and assessment of its allometric equations in oak forests: Northern Zagros, Iran

Khosravi¹,

Namiranian²,

Ghazanfari³

et al. 2012

J. For. Sci.

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“…For indirect measurements, optical methods and LiDAR are commonly used, which are based on Beer-Lambert law. Optical measurements are generally performed with using canopy analysers, hemispherical photography, and remote sensing (Bréda 2003, Jonckheere et al 2004, Dovey & Toit 2006, Arias et al 2007, Nascimento et al 2007, Urban et al 2009, Huang & Pretzsch 2010. LiDAR applies threshold-based separation of laser reflections from the canopy and from the ground (Hosoi & Omasa 2006, Béland et al 2011, Stark et al 2015, Lin & West 2016.…”

Section: Introductionmentioning

confidence: 99%

Assessment of allometric models for leaf area index estimation of Tectona grandis

Chaturvedi¹,

Singh²,

Singh³

et al. 2017

Trop. Plant Res.

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Abstract:We developed allometric models for accurate estimation of Tectona grandis (teak) leaf area index (LAI), for different stem diameter-classes (D-classes). In this study, we harvested teak trees in the tropical dry region of India in the ten stem diameter classes and measured LAI, and developed regression models for the non-destructive estimation of LAI with the help of wood density (ρ), diameter at breast height (D) and plant height (H). Models used for the prediction of biomass of tree components were of the form, linear, logistic, Gompertz and Chapman. Among the four models, non-linear models were more efficient compared to the linear model. We observed more than 60% variability in the LAI, explained by non-linear regression models. The models including ρ and D had greater R 2 and lower standard error of estimate. Our study detected logistic models more appropriate for broad diameter range and Gompertz models for small D-classes. The regression models developed in our study can be applied separately for the ten D-classes, and this could minimize the error occurring during indirect estimation of teak LAI.

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“…O LAI-2000 tem sido amplamente empregado em estudos de estimativa de AF e do índice de área foliar (IAF) em diferentes culturas (Sommer & Lang, 1994;Villalobos et al, 1995;Herbert & Fownes, 1997;Cutini et al, 1998;Barclay & Trofmow, 2000;Xavier et al, 2002;Xavier & Vettorazzi, 2003;Monte et al, 2007;Arias et al, 2007;Lara et al, 2011;Silva et al, 2011;Majasalmi et. al., 2012).…”

Section: Introductionunclassified

Método para estimativa do IAF de árvores isoladas ou de plantações com dossel fechado

Filho

Nova²,

Angelocci³

et al. 2012

Rev. bras. eng. agríc. ambient.

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R ESU M OObjetivou-se, com o presente trabalho, descrever e testar um método simplificado de baixo custo (IAF-LUX) para estimativa do índice de área foliar (IAF) em comparação com um equipamento comercial (LAI-2000, Li-Cor ® ). Ambos foram avaliados em um seringal e em árvores de lima ácida "Tahiti"; posteriormente, os dois métodos foram comparados com medidas destrutivas de área foliar realizadas em uma árvore adulta de lima ácida 'Tahiti'; notou-se, então, que os desvios dos resultados pelo IAF-LUX em relação aos do LAI-2000 foram no máximo de 7,4% na seringueira e de 3,6% em lima ácida "Tahiti". A estimativa da área foliar total utilizando-se o LAI 2000, mostrou boa concordância com as medidas diretas; resultados semelhantes foram obtidos com o IAF-LUX (5% de erro). Para as condições em que foi desenvolvido o trabalho os métodos com base em medida de radiação apresentaram boa precisão na estimativa da área foliar total das árvores de lima ácida, ficando patente que este método pode substituir vantajosamente as outras técnicas usadas, em comparação pelo baixo custo do equipamento, pela facilidade de operação no campo e análise dos dados. Palavras-chave: LAI-2000, luxímetro, citros, Hevea sppMethod to estimate the LAI for isolated trees and continuous canopy crops A B ST R A C T This paper aimed to describe and evaluate a low-cost simplified method (IAF-LUX method) for leaf area index (LAI) estimation, in comparison with well-tested commercial equipment (LAI-2000, Li-Cor®), being both applied for a rubber tree plantation and for a 'Tahiti' acid lime orchard. Later, the results of the both methods were also compared with destructive measurements of leaf area carried out in other 'Tahiti' acid lime adult tree. Considering LAI-2000 as reference, the proposed IAF-LUX method showed deviations of 7.4% for rubber tree and 3.6% for acid lime 'Tahiti'. Comparing the IAF-LUX with destructive measurements, a deviation of 5.0% was observed in acid lime, while LAI-2000 showed deviation of 7.0%. Based on these results, it is concluded that the IAF-LUX method may be used for determining leaf area in the two species, replacing advantageously the other destructive or non-destructive techniques because it is of low cost, easily operated and non-destructive procedure.

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Calibration of LAI-2000 to estimate leaf area index (LAI) and assessment of its relationship with stand productivity in six native and introduced tree species in Costa Rica

Cited by 63 publications

References 40 publications

Estimation of leaf area index and assessment of its allometric equations in oak forests: Northern Zagros, Iran

Estimation of leaf area index and assessment of its allometric equations in oak forests: Northern Zagros, Iran

Assessment of allometric models for leaf area index estimation of Tectona grandis

Método para estimativa do IAF de árvores isoladas ou de plantações com dossel fechado

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