Validation of an efficient visual method for estimating leaf area index in clonal Eucalyptus plantations

Hakamada, Rodrigo; Neto, Carmeni Giunti; Lemos, Cristiane Cz de; Silva, Sérgio Ricardo; Otto, Marina Shinkai Gentil; Hall, Kevin Brown; Stape, José Luiz

doi:10.2989/20702620.2016.1201641

Cited by 12 publications

(9 citation statements)

References 36 publications

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“…Although studies have shown that the analysis of hemispherical photography is more efficient in terms of time, cost, and accuracy of the measure than the use of a ceptometer [46,62], similar performances with positive correlations were previously found between the two methods [63]. There are few references on the use of smartphones with a fisheye clip to take hemispherical photography, and we highlight the feasibility of this method to estimate light intensity.…”

Section: Discussionsupporting

confidence: 64%

“…To measure the light incidence, we first used a ceptometer (AccuPAR LP80, Decagon Devices, Inc., Meter Environment Group, Pullman, WA, USA), taking 19 PAR measurements systematically distributed per plot, 15 measures above timber trees, and extra 4 in the middle of the plots. Immediately before measuring light incidence within each plot, we made an under full sun external reference measure [46] in the road that was less than 50 m apart from the most distant plot. PAR measurements were made on days with a blue, cloudless sky between 11:30 h and 13:30 h. Two readings were made for every measure, and their mean value was calculated for further analyses.…”

Section: Species Familymentioning

confidence: 99%

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Chemical Thinning and Fisheye Clip for Managing Light Intensity in the Understory of Forest Restoration

Barros,

Loiola,

Viani

2023

Forests

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Research highlights: Tropical forest restoration can be supported by the production of timber species in their understory. While they may appear at odds, they can be reconciled to promote environmental conservation and services. The lack of information on the management of tropical species causes a technical constraint for timber production in the understory of restoration sites, especially given the light restrictions. This issue could be amended with the development of methods to easily manage and estimate light availability, targeting management practices that balance restoration success and productivity. Materials and Methods: We conducted this study in an area within the Atlantic Forest, Brazil, where we tested the efficiency of chemical thinning to increase light availability in the understory of a five-year-old restoration planting, aiming to increase the growth rates of desirable timber species. Moreover, we tested the viability of using hemispherical photography taken with a smartphone to assess light incidence to assist restoration management practices. We calculated the percentage of photosynthetically active radiation (PAR) using a ceptometer in four different thinning intensities and compared them to the smartphone measures using correlation analysis. Results: Chemical thinning increased light incidence in the understory, with potential impacts on timber species productivity. Light management through PAR and canopy opening were highly correlated overall, especially after three months of management and 60% of thinning intensity. Conclusions: These findings demonstrate the potential for chemical thinning as a management practice to enhance light availability in the understory of tropical forest restoration sites. Additionally, our study highlights the value of using affordable and accessible tools like smartphones and fisheye clips for the indirect assessment of light conditions to promote natural regeneration and guide forest management and timber production in tropical forest restoration.

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Section: Discussionsupporting

confidence: 64%

Section: Species Familymentioning

confidence: 99%

Chemical Thinning and Fisheye Clip for Managing Light Intensity in the Understory of Forest Restoration

Barros,

Loiola,

Viani

2023

Forests

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“…The definition of the most adequate stocking for each site and species is one of the most important decisions in the silviculture of planted forests [5]. The canopy development, which occurs as a function of tree stockings [7], is directly connected with tree growth [43] and with intraspecific competition-i.e., the competition among trees in a stand. Thus, having a cheaper option to capture this tree feature is relevant for forest science.…”

Section: Discussionmentioning

confidence: 99%

Initial Growth of Gmelina arborea and Efficacy of RGB Image to Capture Canopy Area in a Large Range of Stockings

Hakamada,

Prados-Coronado,

Lages

et al. 2023

Remote Sensing

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At present, there is a high demand for carbon (C) sequestration alternatives; thus, understanding tree growth and the efficacy of remote sensing techniques to capture forest plantation ecophysiology is crucial. This study evaluated the effect of contrasting stockings of Gmelina arborea on its initial growth and aboveground Carbon stock, and the efficacy of aerial images obtained using drones to capture the crown cover at different stockings. The results indicated that denser stockings showed greater tree heights and stem diameter increments, contrary to traditional measurements. The C storage capacity of Gmelina arborea was promising, with an aboveground estimated C stock of about 13 Mg ha−1 in 9 months, making it a valuable and promising species for CO2 sequestration under the context of climate change. The use of simple Red-Green-Blue (RGB) cameras and drones to detect and estimate crown areas in young plantations was mainly viable within the commercial range of stockings (500–2000 trees ha−1), and can be used as a powerful tool to better understand tree initial growth. The results showed effective discrimination without weeds independently of the stocking level; however, when weeds were present, the effectiveness decreased. This research provides valuable insights into forest management and improves the understanding of the silviculture behavior of a potential native species for reforestation in the tropics.

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“…This measurement was implemented to increase the accuracy of crown image analysis, which was processed by Hemisfer software version 3.1. To obtain a more stable image, we supported the camera by a tripod set up at 1 m from the aboveground (Hakamada et al, 2016). All images were analyzed alternately.…”

Section: Methodsmentioning

confidence: 99%

Competition Influences Tree Dimension, Biomass Distribution, and Leaf Area Index of Eucalyptus Urophylla in Dryland Ecosystems at East Nusa Tenggara

WIRABUANA¹,

SADONO²,

MATATULA³

2022

AgricultForest

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Competition is one of the important factors that determine the productivity of forest stands. However, the effect of competition on the growth dynamics at the individual tree level is rarely documented. This study investigated the influence of competition on the tree dimension, biomass, distribution, and leaf area index (LAI) of Eucalyptus urophylla established in dryland ecosystems in East Nusa Tenggara. Data collection was conducted by N-tree sampling method with the number of center points reaching 36 units. The competition among trees was quantified using Hegyi index. Several parameters were measured to describe tree characteristics, including diameter, height, aboveground biomass, and LAI. The results demonstrated a significant influence of competition on the tree dimension, biomass distribution, and LAI of E. urophylla. The individual tree performance declined along with the increase in competition. By contrast, the increased competition gradually improved the relative contribution of branch biomass to the total aboveground biomass. The exponential model best described the linkage between competition and the tree characteristics of E. urophylla in the study site. Referring to these findings, this study concluded that the growth dynamics of E. urophylla at the individual tree level in dryland ecosystems is substantially influenced by competition.

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Validation of an efficient visual method for estimating leaf area index in clonal Eucalyptus plantations

Cited by 12 publications

References 36 publications

Chemical Thinning and Fisheye Clip for Managing Light Intensity in the Understory of Forest Restoration

Chemical Thinning and Fisheye Clip for Managing Light Intensity in the Understory of Forest Restoration

Initial Growth of Gmelina arborea and Efficacy of RGB Image to Capture Canopy Area in a Large Range of Stockings

Competition Influences Tree Dimension, Biomass Distribution, and Leaf Area Index of Eucalyptus Urophylla in Dryland Ecosystems at East Nusa Tenggara

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