Electrical resistance related to phloem width in red maple

Carter, Jonathan K.; Blanchard, Robert O.

doi:10.1139/x78-015

Cited by 16 publications

(11 citation statements)

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“…SHORTLE et al (1977SHORTLE et al ( , 1979 showed that electrical resistance to a pulsed electric current in the cambial zone of sprout red maple, hybrid poplar, and sugar maple was inversely proportional to rate of growth. CARTER and BLANCHARD (1978) showed a high negative correlation between electrical resistance and phloem thickness in red maple, as did COLE and JENSEN (1979) in lodgepole pine. Together, these studies suggest that growth rate and hence, tree vigor, are related to bark thickness.…”

Section: Discussionmentioning

confidence: 88%

Some factors affecting canker formation in American beech inoculated with Nectria coccinea var. faginata

1980

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Combinations of Neetria eoceinea var. faginata (tbe primary causal agent of beech bark disease), Fusarium oxysporum, and associated bacteria were inoeulated into Ameriean beech trees at two sites in New Hampshire. Neither F. oxysporum nor bacteria appeared to affect the size of eankers formed. Canker size was signifieantly related to bark thickness at one site when only one mating type of the pathogen was inoeulated alone.

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Section: Discussionmentioning

confidence: 88%

Some factors affecting canker formation in American beech inoculated with Nectria coccinea var. faginata

1980

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“…Like Stamm (), we found that wood moisture content can supersede species identity as a determinant of electrical resistivity. Although the important role of moisture in wood resistivity is well established (Al Hagrey, ; Carter & Blanchard, ; Gora & Yanoviak, ), no other studies have compared moisture‐resistivity patterns among growth forms or trees in situ.…”

Section: Discussionmentioning

confidence: 99%

Effects of lightning on trees: A predictive model based on in situ electrical resistivity

Gora

Bitzer

Burchfield

et al. 2017

Ecology and Evolution

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The effects of lightning on trees range from catastrophic death to the absence of observable damage. Such differences may be predictable among tree species, and more generally among plant life history strategies and growth forms. We used field‐collected electrical resistivity data in temperate and tropical forests to model how the distribution of power from a lightning discharge varies with tree size and identity, and with the presence of lianas. Estimated heating density (heat generated per volume of tree tissue) and maximum power (maximum rate of heating) from a standardized lightning discharge differed 300% among tree species. Tree size and morphology also were important; the heating density of a hypothetical 10 m tall Alseis blackiana was 49 times greater than for a 30 m tall conspecific, and 127 times greater than for a 30 m tall Dipteryx panamensis. Lianas may protect trees from lightning by conducting electric current; estimated heating and maximum power were reduced by 60% (±7.1%) for trees with one liana and by 87% (±4.0%) for trees with three lianas. This study provides the first quantitative mechanism describing how differences among trees can influence lightning–tree interactions, and how lianas can serve as natural lightning rods for trees.

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“…There was also a significant correlation between average stand SER and several spectral indices. While SER could be correlated to stress conditions, others have cautioned (e.g., Newbanks andTattar 1977, Carter andBlanchard 1978) that several other factors, such as thermal variation and seasonal changes, can influence results. It is important, therefore, to ensure that changes in SER are a true reflection of stress-related effects.…”

Section: Individual Tree Assessmentsmentioning

confidence: 99%

The Bioindicators of Forest Condition Project: A physiological, remote sensing approach

Sampson¹,

Mohammed²,

Zarco‐Tejada³

et al. 2000

The Forestry Chronicle

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Objective measures of forest ecosystem condition are needed to gauge the effects of management activities and natural phenomena on sustainability. The Bioindicators of Forest Condition Project seeks to develop a Forest Condition Rating (FCR) system using a physiological, remote sensing approach. In particular, the goal of the project is to test whether hyperspectral remote sensing may be used to infer stand-level information about pigment concentration, chlorophyll fluorescence, and other physiological features of condition. The project spans a four-year period of intensive sampling in tolerant hardwood forests in Ontario using the Compact Airborne Spectrographic Imager (CASI). For each airborne campaign, concurrent ground-based sampling for leaf physiological features was performed. Controlled laboratory and greenhouse studies were also conducted to derive relationships between leaf-based spectral measurements and physiology in the presence of environmental stresses. The project has identified several promising bioindicators of strain that are discernible from hyperspectral images and related to ground-based physiology. The most promising remote indicator for semi-operational testing is estimation of chlorophyll content, which can be used to classify maple stands on a five-stage scale of health. Chlorophyll fluorescence has also been discerned from spectral signatures, but our studies indicate it may be confounded by chlorophyll content. The intent here is to update the forestry community on progress made, insights gained, and the practical implications of the research.

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Electrical resistance related to phloem width in red maple

Cited by 16 publications

References 0 publications

Some factors affecting canker formation in American beech inoculated with Nectria coccinea var. faginata

Some factors affecting canker formation in American beech inoculated with Nectria coccinea var. faginata

Effects of lightning on trees: A predictive model based on in situ electrical resistivity

The Bioindicators of Forest Condition Project: A physiological, remote sensing approach

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