Chlorophyll and nitrogen determination for plantation-grown Eucalyptus nitens and E. globulus using a non-destructive meter

Pinkard, EA; Patel, V. S.; Mohammed, CL

doi:10.1016/j.foreco.2005.11.003

Cited by 82 publications

(82 citation statements)

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“…Likewise, the equations were found to be species-specific when leaves of similar age were considered (Castelli et al, 1996;Pinkard et al, 2006). When the data for the four species were pooled per leaf stage, regression residuals revealed a positive statistical correlation with fresh LMA in all cases (P < 0.01, data not shown).…”

Section: Discussionmentioning

confidence: 83%

“…To explore the relationship between CCI readings and chlorophyll data, several models previously discussed in the literature were used: linear, exponential, log-transformed and second-order polynomial functions (Berg and Perkins, 2004;Pinkard et al, 2006;Richardson et al, 2002;Uddling et al, 2007). Both log-transformed and secondorder polynomial functions provided the best explanation of the data, with very similar results.…”

Section: Discussionmentioning

confidence: 99%

“…In recent decades, chlorophyll meters have been increasingly used in the horticultural sciences as an effective management tool for evaluating nutrient and stress status, and more than 200 scientific studies reporting their usefulness have been published. However, in the field of forestry, research exploring the potential of chlorophyll meters has been more limited, despite significant correlations between chlorophyll indices and chlorophyll and/or N contents (Berg and Perkins, 2004;Chang and Robinson, 2003;Pinkard et al, 2006;Richardson et al, 2002;Sibley et al, 1996;Uddling et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…In many cases, non-linear equations have been used to explain the relationship between the two parameters better due to non-uniform distribution of chlorophyll and differential scattering and reflection of light at the wavelengths used (Markwell et al, 1995;Monge and Bugbee, 1992;Uddling et al, 2007). In this sense, several studies have reported that calibration should be speciesspecific (Castelli et al, 1996;Pinkard et al, 2006;Uddling et al, 2007;Yamamoto et al, 2002), and that it may even be affected by growing conditions (Campbell et al, 1990;Jifon et al, 2005). Another issue, although little addressed (Thompson et al, 1996), is that leaf structural parameters (LMA, tissue density, water content, etc.)…”

Section: Introductionmentioning

confidence: 99%

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Estimation of chlorophyll in Quercus leaves using a portable chlorophyll meter: effects of species and leaf age

Silla¹,

González-Gil²,

González-Molina³

et al. 2010

Ann. For. Sci.

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Section: Discussionmentioning

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Estimation of chlorophyll in Quercus leaves using a portable chlorophyll meter: effects of species and leaf age

Silla¹,

González-Gil²,

González-Molina³

et al. 2010

Ann. For. Sci.

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“…Chlorophyll concentration (Chl, mg m −2 ) is strongly and linearly related to CI (see Pinkard et al, 2006). In this study, chlorophyll index was converted to concentration using the equation, Ln[Chl] = 1.49 × Ln[CI] − 6.49 after confirming that this was not affected by defoliation treatments using a group linear regression analysis on Genstat10 (Quentin A.G., unpublished data).…”

Section: Gas Exchange and Chlorophyll Concentrationmentioning

confidence: 78%

Do artificial and natural defoliation have similar effects on physiology of Eucalyptus globulus Labill. seedlings?

et al. 2010

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Abstract• Artificial defoliation is often used to simulate defoliation by herbivory and is usually considered a good indication of a plant's response to a given type of damage. However, the findings of studies directly comparing the two defoliation types are inconsistent.• Here, the short term effects of artificial and insect defoliation by larvae of Paropsisterna agricola on growth, biomass allocation and photosynthetic capacity of Eucalyptus globulus seedlings were compared in a glasshouse experiment. The artificial defoliation was carried out to closely resemble the spatial patterns observed for insect defoliation.• Height and diameter increments were reduced as a result of insect defoliation, whereas artificial defoliation had no significant effect on height. Increased photosynthetic capacity was observed in response to both treatments, but the magnitude of this increase was larger in insect-than in artificially-defoliated seedlings. Significant reductions in foliar carbohydrate content and total biomass were noticeable in artificially-defoliated seedlings. Although the foliar carbohydrate levels also decreased across the crown zones following insect defoliation treatment, seedlings allocated a large amount of their biomass in the branches of the damaged zone.• Despite our best endeavours to simulate insect defoliation in the artificial treatment, the latter may not reflect accurately the full strength of the effects. However, artificial and insect defoliation were similar in their direction of the responses they caused in E. globulus seedlings. Mots-clés :Paropsisterna agricola / croissance / allocation de la biomasse / capacité de la photosynthèse / glucides Résumé -Les défoliations artificielle et naturelle ont-elles des effets similaires sur la physiologie de jeune plants d'Eucalyptus globulus Labill. ?• La défoliation artificielle est couramment employée pour simuler la défoliation par les insectes herbivores et elle est généralement considérée comme un bon indicateur de la réponse des plantes pour un type de dommage donné. Cependant, les résultats d'études comparant directement les deux types de défoliation sont inconsistants.• Ici, les effets court terme des défoliations artificielles et naturelles par la larve de Paropsisterna agricola ont été comparés au plan de la croissance, de l'allocation de la biomasse et de la capacité de photosynthèse dans une expérimentation conduite en serre. La défoliation artificielle a été menée pour ressembler étroitement aux modèles spatiaux observés avec la défoliation par les insectes.• À la suite de la défoliation par les insectes, les accroissements en hauteur et en diamètre ont été ré-duits, alors que la défoliation artificielle n'a eu aucun effet significatif sur la hauteur. L'augmentation de la capacité de photosynthèse a été observée en réponses aux deux traitements, mais l'ampleur de cette augmentation a été plus forte pour les plants défoliés par les insectes que pour les plants artificiellement défoliés. Des réductions significatives de la teneur foliaire en...

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Application of Genetic Algorithm in the Modeling of Leaf Chlorophyll Level Based on Vis/Nir Reflection Spectroscopy

Yang

2009

IFIP Advances in Information and Communication Technology

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In order to detect leaf chlorophyll level nondestructively and instantly, VIS/NIR reflection spectroscopy technique was examined. In the test, 70 leaf samples were collected for model calibration and another 50 for model verification. Each leaf sample was optically measured by USB4000, a modular spectrometer. By the observation of spectral curves, the spectral range between 650nm and 750nm was found significant for mathematic modeling of leaf chlorophyll level. SPAD-502 meter was used for chemometrical measurement of leaf chlorophyll value. In the test, it was found necessary to put leaf thickness into consideration. The procedure of shaping the prediction model is as follows: First, leaf chlorophyll level prediction equation was created with uncertain parameters. Second, a genetic algorithm was programmed by Visual Basic 6.0 for parameter optimization. As the result of the calculation, the optimal spectral range was narrowed within 683.24nm and 733.91nm. Compared with the R2=0.2309 for calibration set and R2=0.5675 for on the spectral modeling is significant: the R2 of calibration set and verification set has been improved as high as 0.8658 and 0.9161 respectively. The test showed that it is practical to use VIS/NIR reflection spectrometer for the quantitative determination of leaf chlorophyll level.

show abstract

Chlorophyll and nitrogen determination for plantation-grown Eucalyptus nitens and E. globulus using a non-destructive meter

Cited by 82 publications

References 21 publications

Estimation of chlorophyll in Quercus leaves using a portable chlorophyll meter: effects of species and leaf age

Estimation of chlorophyll in Quercus leaves using a portable chlorophyll meter: effects of species and leaf age

Do artificial and natural defoliation have similar effects on physiology of Eucalyptus globulus Labill. seedlings?

Application of Genetic Algorithm in the Modeling of Leaf Chlorophyll Level Based on Vis/Nir Reflection Spectroscopy

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