Crown Area as a Parameter for Biomass Estimation of Croton sonderianus Müll. Arg.

Dombroski, Jéferson Luiz Dallabona; Pinto, José Rivanildo de Souza

doi:10.1590/2179-8087.024715

Cited by 3 publications

(3 citation statements)

References 19 publications

(19 reference statements)

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“…The trees were distributed between the ages of 3.4 to 21.4 years, with 22, 35, 19, 13, 8, and 3% in classes 3 ˫ 6, 6 ˫ 9, 9 ˫ 12, 12 ˫ 15, 15 ˫ 18, ≥ 18 years of age, respectively. For this study, three site classes were established (class I: 30.5 m; class II: 25.5 m; and class III: 20.5 m) using the guide curve method, the Chapman-Richards model, and an indexage of 18 years, through the equation dynamics of the stand. For the chosen trees, the transversal area for each stem was calculated and subsequently added, resulting in the diameter equivalent to this transversal area (Dombroski & Pinto, 2019). In these cases, the total height corresponding to the highest stem was used.…”

Section: Methodsmentioning

confidence: 99%

Competition indexes for individual Pinus taeda L. trees in non-thinned commercial stands

Miranda,

Figueiredo Filho,

Curto

et al. 2022

Agraria

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The competition process in a forest plantation originates from the dispute for resources, which are essential for growth. Several indexes were proposed to assess competition for different species, but such studies for pine trees are scarce in the country. These competition indices are essential in the forest modelling process. Thus, the aim of this study was to assess competition indexes for a non-thinned Pinus taeda L. stand. Data from permanent sampling units in the Telêmaco Borba region, Paraná, Brazil, were used, and tree ages ranged from 3.4 to 21.4 years. Eight indexes were assessed with a Spearman correlation matrix with dendrometric and stand variables. Moreover, for each site class, the average trend of competition indexes by class diameter and age was analysed. There was no single index that correlated the most with all variables. For diameter, height and probability of mortality variables, the most correlated indexes were Glover and Hool, Lorimer, and Stage, respectively. The competition indexes have satisfactorily shown the average behaviour of competition in relation to age and site classes. The selection of a single index will depend on its use, being necessary specific tests according to purpose.

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Section: Methodsmentioning

confidence: 99%

Competition indexes for individual Pinus taeda L. trees in non-thinned commercial stands

Miranda,

Figueiredo Filho,

Curto

et al. 2022

Agraria

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“…This volume represented the sum of commercial values with bark of each tree trunk. For this purpose, the use of equivalent diameter (d eq ) was needed for forked trees (SILVA et al, 2018;DOMBROSKI;PINTO, 2019). This diameter was obtained by the square root of the sum of each squared diameter at breast height of tree trunks, representing the equivalent diameter to a given segmental area (CAMPOS & LEITE, 2017).…”

Section: Methodsmentioning

confidence: 99%

WOOD VOLUMETRY OF Tachigali vulgaris PURE PLANTATIONS IN DIFFERENT PLANTING SPACINGS

Ramos

Miranda

Soares

et al. 2021

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The aim of this study was to develop volumetric equations for tachi-branco trees (Tachigali vulgaris L. G. Silva & H. C. Lima), by assessing the effect of initial planting spacing in volume estimates, as well as developing an equation to estimate the equivalent diameter (deq). Data are from an experiment located in north Pará. The experiment was conducted with the randomized blocks design, being three blocks with six treatments each. The most used volumetric models were assessed for two distinct situations: considering each trunk as a tree and using the tree deq as independent variables in the volumetric model. The need for individual equations for initial planting spacing was tested. In addition, an equation for deq estimate was proposed. The use of deq provided more precise and accurate volumetric estimates regarding diameter at breast height. Among the models tested, the Schumacher-Hall model was selected. Through the model identity test, the equation can be used to estimate tree volume of Tachigali vulgaris, regardless of planting spacing. The equivalent diameter can be estimated via equation from minimum and maximum diameters of tree trunks. The maximum percentage differences of volume by hectare obtained with the measurement of all trunks and deq were only 5% without loss in production accuracy per unit of area

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“…Plants, through photosynthesis, sequester atmospheric CO 2 and convert it as biomass in different parts of plant and soil organic matter (Zaki et al 2018). Biomass is a key indicator of the health of an ecosystem, a source of energy and a mitigator of GHGs, both directly and indirectly (Biilgen et al 2007;Dombroski and Pinto 2019). Accurate and easy methods to measure biomass are, therefore, crucial to determine ecological services of forests and forest plantations (Ablo et al 2015;Zeng 2015), and necessary for implementing climate change mitigation strategies (Goetz et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Morphometry of leaf and shoot variables to assess aboveground biomass structure and carbon sequestration by different varieties of white mulberry (Morus alba L.)

Bajwa¹,

Umair

Nawab

et al. 2021

J. For. Res.

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Mulberry is economically important and can also play a pivotal role in mitigating greenhouse gases. Leaf and shoot traits were measured for Morus alba var. Kanmasi, M. alba var. Karyansuban, M. alba var. Latifolia, and M. alba var. PFI-1 to assess aboveground biomass (AGB) and carbon sequestration. Variety-specific and multivariety allometric AGB models were developed using the equivalent diameter at breast height (EDBH) and plant height (H). The complete-harvest method was used to measure leaf and shoot traits and biomass, and the ash method was used to measure organic carbon content. The results showed significant (p < 0.01) varietal differences in leaf and shoot traits, AGB and carbon sequestration. PFI-1 variety had the greatest leaf density (mean ± SE: 1828.3 ± 0.3 leaves tree−1), Karyansuban had the largest mean leaf area (185.94 ± 8.95 cm2). A diminishing return was found between leaf area and leaf density. Latifolia had the highest shoot density per tree (46.6 ± 1.83 shoots tree−1), total shoot length (264.1 ± 2.32 m), dry biomass (16.69 ± 0.58 kg tree−1), carbon sequestration (9.99 ± 0.32 kg tree−1) and CO2 mitigation (36.67 ± 1.16 kg). The variety-specific AGB models b(EDBH) and b(EDBH)2 showed good fit and reasonable accuracy with a coefficient of determination (R2) = 0.98–0.99, standard error of estimates (SEE) = 0.1125–0.3130 and root mean square error (RMSE) = 0.1084–0.3017. The multivariety models bln(EDBH) and (EDBH)0.756 showed good-fitness and accuracy with R2 = 0.85–0.86, SEE = 1.6231–1.6445 and RMSE = 1.609–1.630. On the basis of these findings, variety Latifolia has good potential for biomass production, and allometric equations based on EDBH can be used to estimate AGB with a reasonable accuracy.

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Crown Area as a Parameter for Biomass Estimation of Croton sonderianus Müll. Arg.

Cited by 3 publications

References 19 publications

Competition indexes for individual Pinus taeda L. trees in non-thinned commercial stands

Competition indexes for individual Pinus taeda L. trees in non-thinned commercial stands

WOOD VOLUMETRY OF Tachigali vulgaris PURE PLANTATIONS IN DIFFERENT PLANTING SPACINGS

Morphometry of leaf and shoot variables to assess aboveground biomass structure and carbon sequestration by different varieties of white mulberry (Morus alba L.)

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