Relationship Between the Degree of Resistance to a Pulsed Electric Current and Wood in Progressive Stages of Discoloration and Decay in Living Trees

Tattar, Terry A.; Shigo, Alex L.; Chase, Thomas E.

doi:10.1139/x72-039

Cited by 56 publications

(33 citation statements)

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“…The fact that false positives occurred more frequently at stump level may relate to the presence of larger areas of sapwood and higher concentrations of Na + . Na + is believed to be a highly movable element (Foster and Lang, 1982) that can contribute to the electrical conductivity of the stem (Tattar et al, 1972). In line with our results, Na + variation within tree stems seemed to be associated with a higher share of sapwood in the section (Ovington and Madgwick, 1958;Rothpfeffer and Karltun, 2007).…”

Section: Discussionsupporting

confidence: 90%

“…Our results seem to confirm that larger decay columns generally correspond to a lower electrical resistivity (Shortle and Smith, 1987), and that potassium is the main ion associated with an increase in the conductivity of decayed wood (Tattar et al, 1972). In our study, most of the observed decay was produced by the white rot fungi H. annosum and Armillaria.…”

Section: Discussionsupporting

confidence: 84%

“…A large sapwood typically associates with a higher growth rate (Sellin, 1996), which might result in a greater quantity of ions being pumped from the soil. In these cases, one would expect that a higher moisture content would dilute the effect of the ions (Tattar et al, 1972); however, this did not seem to be the case in our samples because no differences between sapwood moisture content in false positives and true negatives were observed.…”

Section: Discussionmentioning

confidence: 73%

See 2 more Smart Citations

Accuracy of the Rotfinder instrument in detecting decay on Norway spruce (Picea abies) trees

Oliva

Romeralo

Stenlid

2011

Forest Ecology and Management

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Section: Discussionsupporting

confidence: 90%

Section: Discussionsupporting

confidence: 84%

Section: Discussionmentioning

confidence: 73%

See 1 more Smart Citation

Accuracy of the Rotfinder instrument in detecting decay on Norway spruce (Picea abies) trees

Oliva

Romeralo

Stenlid

2011

Forest Ecology and Management

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“…Wood infected with decay fungi usually has different wood moisture contents than the uninfected wood and contains higher amounts of electrolytes (Tattar et al, 1972). Because moisture content and electrolytes have a strong influence on the electric properties of the material, its electric conductivity differs also (Skutt et al, 1972;Tattar and Blanchard, 1976).…”

Section: Introductionmentioning

confidence: 99%

Non-destructive monitoring of early stages of white rot by Trametes versicolor in Fraxinus excelsior

Bieker¹,

Kehr²,

Weber³

et al. 2010

Ann. For. Sci.

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Abstract• Non-destructive detection of fungal decay in living trees is relevant for forest management of valuable species, hazard tree assessment, and research in forest pathology. A variety of tomographic methods, based on stress wave timing, radioactive radiation, or electrical resistivity have been used to detect decay in standing trees non-destructively. But apart from mobile gamma ray computed tomography (Habermehl and Ridder, 1993) which is virtually unavailable, the detection of incipient stages of decay is still not possible.• Wood moisture and electrolyte content influence the electric resistivity of wood. Both are changed by fungal decay. Therefore electric resistivity tomography (ERT) should detect decay in its early stages. Then it could be used to monitor the spatial and temporal progress of degradation.• We infected four Fraxinus excelsior trees with Trametes versicolor using wooden dowels and measured two-dimensional electric resistivity tomograms 3, 10, 13 and 21 months after infection. Immediately after the last electric resistivity measurement trees were felled for further analyses of stem cross-sections. Wood moisture content and raw density had significantly increased in infected areas, but dry density had not significantly changed after 21 months. Areas of very low electric resistivity around the infected wounds correlated very well with infected wood in the stem cross-sections. Increasing areas of low electric resistivity around the infected wounds during consecutive measurements indicate increasing areas of infected wood.• We conclude that the growth of white rot by Trametes versicolor can be monitored with electric resistivity tomography (ERT) beginning from incipient stages, even before wood density decreases. ERT could therefore be a powerful research tool for decay dynamics as well as a method for diagnosing wood decay in forestry and arboriculture.Mots-clés : développement / ERT / contrôle / tomographie / pourriture fongique du bois Résumé -Contrôle non destructif des premiers stades de la pourriture blanche de Trametes versicolor chez Fraxinus excelsior.• Le contrôle non destructif des champignons de la pourriture du bois dans les arbres vivants est pertinent pour la gestion forestière des essences précieuses, l'évaluation des risques de l'arbre, et la recherche en pathologie forestière. Une variété de méthodes de tomographie, sur la base d'onde de contraintes cadencées, des radiations radioactives, ou de la résistivité électrique ont été utilisés pour détecter la pourriture des arbres sur pied de façon non destructive. Mais, en dehors de la tomographie à rayon gamma mobile (Habermehl et Ridder, 1993) qui est pratiquement indisponible, la détection des débuts de pourriture n'est pas encore possible.• L'humidité du bois et le contenu électrolytique influence la résistivité électrique du bois. Les deux sont modifiés par la pourriture fongique. Par conséquent, la tomographie de résistivité électrique (ERT) devrait détecter la pourriture à ses débuts. Ensuite, elle pourrait être utilisée...

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“…(Tattar et al, 1972;Wargo & Skutt, 1975;Shortle et al, 1979;Shortle & Ostrofsky, 1983;Tomiczek, 1987 (Tattar et al, 1972;Malia & Tattar, 1978;Blanchard et al, 1983). Cette résistance électrique est inversement proportionnelle à la vitalité de l'arbre : quand la résistance électrique augmente, la vitalité de l'arbre diminue.…”

Section: Introductionunclassified

Etude de la résistance électrique du cambium dans les épicéas (Picea abies L.) dépérissants

Garrec¹,

Heymes²,

Rose³

et al. 1989

Ann. For. Sci.

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Simultaneously, the influence of a number of factors (position of the electrodes on the trunk, number of measurements, diameter of the tree and external conditions) was evaluated.In healthy spruce, it appears that resistance increases when the diameter of the trees decreases, and that this relation between resistance and diameter depends on the stand (influence of soil fertility ?).In declining spruce, we show that this phenomenon leads to a significant increase in cambial electrical resistance, and that the smaller the diameter of the spruce, the more important this increase is. This study points out that the cambial electrical resistance measurements corroborate the results provided by conventional methods (rate of needle loss), but by quantifying, specifying and magnifying them. Therefore the cambial electrical resistance measurements can be used in symptomatology to provide a rapid assessment in the field of the dec7ree of vitality in declining spruce over time.cambial electrical resistance -spruce -decline -symptomato,logy

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Relationship Between the Degree of Resistance to a Pulsed Electric Current and Wood in Progressive Stages of Discoloration and Decay in Living Trees

Cited by 56 publications

References 0 publications

Accuracy of the Rotfinder instrument in detecting decay on Norway spruce (Picea abies) trees

Accuracy of the Rotfinder instrument in detecting decay on Norway spruce (Picea abies) trees

Non-destructive monitoring of early stages of white rot by Trametes versicolor in Fraxinus excelsior

Etude de la résistance électrique du cambium dans les épicéas (Picea abies L.) dépérissants

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