Allometric models for non-destructive leaf area estimation of Jatropha curcas

Pompelli, Marcelo F.; Antunes, Werner Camargos; Ferreira, Denise; Cavalcante, P.G.S.; Wanderley-Filho, H.C.L.; Endres, Laurício

doi:10.1016/j.biombioe.2011.10.010

Cited by 85 publications

(92 citation statements)

References 30 publications

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“…Leaf area was estimated using allometric equation generated by Pompelli et al (2012). Specific leaf area (SLA) was determined as leaf area per unit dry weight (cm 2 g -1 ).…”

Section: Leaf and Fine Root Measurementsmentioning

confidence: 99%

Tree or shrub: a functional branch analysis of Jatropha curcas L.

Tjeuw¹,

Mulia²,

Slingerland³

et al. 2015

Agroforest Syst

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Jatropha curcas is an oil-bearing semievergreen shrub or small tree with potential as a source of sustainable biofuel, yet information regarding vegetative and fruit biomass in relation to plant architecture is lacking. Research conducted in Indonesia used the tree based functional branch analysis (FBA) model as a non-destructive method to estimate above and belowground biomass, and plant architecture. The FBA utility for shrubs was unknown and required modification. This research used destructive measurements to validate modifications to the FBA model that included subcategorisation of the tapering coefficient for twig, branch, and wood diameter classes, and addition of a fruit load parameter in the distal link. The modified FBA model confirmed jatropha to be a shrub rather than a tree, producing variable estimates for aboveground biomass. This variation was due to morphological plasticity in the length-diameter relationship of the branches that diverged from fractal branching architecture. Fruit biomass variation between replicates was not well estimated and total proximal root diameter was a poor predictor of total root biomass, due to the proximal roots having enlarged water storage structures that do not follow fractal branching assumptions. Jatropha fruit was shown to predominate on twigs with a diameter between 0.9 and 1.4 cm. Understanding the correlation between fruit development and plant architecture will be necessary for fine-tuning the FBA model for future commercial breeding and selection. The high degree of morphological plasticity displayed by jatropha requires consideration when determining plant biomass.

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“…Leaf area was estimated using allometric equation generated by Pompelli et al (2012). Specific leaf area (SLA) was determined as leaf area per unit dry weight (cm 2 g -1 ).…”

Section: Leaf and Fine Root Measurementsmentioning

confidence: 99%

Tree or shrub: a functional branch analysis of Jatropha curcas L.

Tjeuw¹,

Mulia²,

Slingerland³

et al. 2015

Agroforest Syst

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“…Leaf area determination: Leaf areas were computed using an allometric method that was previously determined for this species (Pompelli et al, 2012).…”

Section: Biochemical Measurementsmentioning

confidence: 99%

Photosynthesis and antioxidant activity in Jatropha curcas L. under salt stress

Campos

Hsie

Granja

et al. 2012

Braz. J. Plant Physiol.

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Biodiesel is an alternative to petroleum diesel fuel. It is a renewable, biodegradable, and nontoxic biofuel. Interest in the production of biodiesel from Jatropha curcas L. seeds has increased in recent years, but the ability of J. curcas to grow in salt-prone areas, such as the Caatinga semiarid region, has received considerably meager attention. The aim of this study was to identify the main physiological processes that can elucidate the pattern of responses of J. curcas irrigated with saline water, which commonly occurs in the semiarid Caatinga region. This study measured the activity of the antioxidant enzymes involved in the scavenging of reactive oxygen species, which include catalase (CAT) and ascorbate peroxidase (APX), as well as malondialdehyde (MDA) levels. The levels of chlorophyll (Chl), carotenoids, amino acids, proline, and soluble proteins were also analyzed. The net carbon assimilation rate (P N ), stomata conductance (g s ), and transpiration rate (E) decreased with salt stress. The activities of CAT and APX were decreased, while H 2 O 2 and MDA levels as well as electrolyte leakage were significantly increased in salt-stressed plants compared to the untreated ones. These observations suggest that the ability of J. curcas plants resist to salt stress is associated with the activities of protective enzymes and their defensive functions. However, our results indicate that the reactive oxygen species scavenging system is not sufficient to protect J. curcas leaves against oxidative damage caused by salt stress, and, therefore, it cannot be treated as a salt tolerant plant species.

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“…As reported by Chianucci & Cutini (2013), over the last two decades much attention has been given to indirect measurements of canopy properties in forest ecosystems using ground-based instruments, mainly because harvesting of trees for direct measurement is labor-intensive, time-consuming, destructive, and practical only over small areas. Pompelli et al (2012) reported that allometric models can be very accurate and proved their capacity to produce results with Forest leaf area index (LAI) is an important structural parameter controlling many biological and physiological processes associated with vegetation. A wide array of methods for its estimation has been proposed, including those based on the sunfleck ceptometer, a ground-based easy-to-use device taking non-destructive LAI measures.…”

Section: Introductionmentioning

confidence: 99%

“…According to Jonckheere et al (2004), allometric techniques are indirect methods of LAI measurement and rely on relationships between leaf area and any dimension(s) of the woody plant element carrying the green leaf biomass, i.e., stem diameter, tree height, crown base height, etc. Pompelli et al (2012) concluded that allometric methods, which are based on destructive sampling, can be very accurate. However, allometric relations are influenced by site-dependent factors such as species, age, stand density and other stand parameters, and therefore may not be transferable to other stands (Chen & Cihlar 1995, Deblonde et al 1994.…”

Section: Introductionmentioning

confidence: 99%

“…A close correspondence between the theoretical and allometric LAI would be taken to indicate that the latter could be regarded as a reference LAI against which to correct the ceptometer measurements, based on the assumptions of Pompelli et al (2012). This new methodology provides that the Ceptometer LAI is corrected based on structural variables (in this case the basal area per hectare), and counters the assumption that ceptometer measurements invariably underestimate reference LAI values and that the bias is not always a constant fraction of the estimated value.…”

Section: Introductionmentioning

confidence: 99%

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