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Variations in the radial gradient of sap velocity in trunks of forest and fruit trees
Year:
2008
Source of publication :
Plant and Soil
Authors :
Cohen, Shabtai
;
.
Cohen, Yehezkel
;
.
Schiller, Gabriel
;
.
Volume :
305
Co-Authors:
Cohen, Y., Department of Environmental Physics and Irrigation, Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, P.O. Box 6, Bet-Dagan, Israel
Cohen, S., Department of Environmental Physics and Irrigation, Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, P.O. Box 6, Bet-Dagan, Israel
Cantuarias-Aviles, T., Departamento de Produção Vegetal, USP/ESALQ, Piracicaba, SP, Brazil
Schiller, G., Institute of Plant Science, Agricultural Research Organization, P.O. Box 6, Bet-Dagan, Israel
Facilitators :
From page:
49
To page:
59
(
Total pages:
11
)
Abstract:
We studied the radial pattern of sap velocity (v) in trunks of six forest species: Cupressus sempervirens L; Eucalyptus camaldulensis F. Muell; Pinus halepensis Mill. (Alleppo pine); Quercus aegilops L. ssp. ithaburensis [Decne] Boiss; Quercus calliprinos Webb; Quercus rotundifolia Lam. (Syn. Quercus ilex spp. Rotundifolia) and three fruit species: Citrus sinensis L. Osback; Malus domestica cv. Golden Delicious; Persea americana Mill. Data was selected from measurements made over a period of 15 years. For each species, at least data of 1-2 weeks measured on days with clear sky and after a rain event or irrigation were analyzed. Measurements were made with the T max heat pulse method, and six points were measured along the radius of the trunk. Two types of radial pattern were found; in one type the highest v value was recorded near the cambium, decreasing toward the heartwood; and the other type had low v near the cambium increasing toward a depth of 12 to 20 mm below the cambium and decreasing with depth to the heartwood. There was large interspecies variability of v in both the pattern of radial gradient with depth and the distance between the cambium and the border of conducting sapwood. Variations in radial pattern of v between trees within species were generally small with a coefficient of variation of 4-20%. The mean fractions of volumetric flow in the 0-16 and 0-24 mm layers below the cambium were 59% and 79% of the total flow, respectively. The distance between the cambium and the border between conducting and non-conducting sapwood varied from 31 to 66 mm in the various species. The radial distribution of sap velocity with azimuth around the trunk had a coefficient of variation similar to that found between trees of the same species. The amplitude of the azimuthal variation changed during the day; it was high in the mornings and evenings and low at noon. The variation of sap velocity in three azimuths was more affected by the structure of each individual trunk than by the position with respect to the sun. © 2007 Springer Science+Business Media B.V.
Note:
Related Files :
Cupressus
Cupressus sempervirens
Eucalyptus
interspecific variation
Persea americana
Pinus halepensis
sap flow
Show More
Related Content
More details
DOI :
10.1007/s11104-007-9351-0
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
29993
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:51
Scientific Publication
Variations in the radial gradient of sap velocity in trunks of forest and fruit trees
305
Cohen, Y., Department of Environmental Physics and Irrigation, Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, P.O. Box 6, Bet-Dagan, Israel
Cohen, S., Department of Environmental Physics and Irrigation, Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, P.O. Box 6, Bet-Dagan, Israel
Cantuarias-Aviles, T., Departamento de Produção Vegetal, USP/ESALQ, Piracicaba, SP, Brazil
Schiller, G., Institute of Plant Science, Agricultural Research Organization, P.O. Box 6, Bet-Dagan, Israel
Variations in the radial gradient of sap velocity in trunks of forest and fruit trees
We studied the radial pattern of sap velocity (v) in trunks of six forest species: Cupressus sempervirens L; Eucalyptus camaldulensis F. Muell; Pinus halepensis Mill. (Alleppo pine); Quercus aegilops L. ssp. ithaburensis [Decne] Boiss; Quercus calliprinos Webb; Quercus rotundifolia Lam. (Syn. Quercus ilex spp. Rotundifolia) and three fruit species: Citrus sinensis L. Osback; Malus domestica cv. Golden Delicious; Persea americana Mill. Data was selected from measurements made over a period of 15 years. For each species, at least data of 1-2 weeks measured on days with clear sky and after a rain event or irrigation were analyzed. Measurements were made with the T max heat pulse method, and six points were measured along the radius of the trunk. Two types of radial pattern were found; in one type the highest v value was recorded near the cambium, decreasing toward the heartwood; and the other type had low v near the cambium increasing toward a depth of 12 to 20 mm below the cambium and decreasing with depth to the heartwood. There was large interspecies variability of v in both the pattern of radial gradient with depth and the distance between the cambium and the border of conducting sapwood. Variations in radial pattern of v between trees within species were generally small with a coefficient of variation of 4-20%. The mean fractions of volumetric flow in the 0-16 and 0-24 mm layers below the cambium were 59% and 79% of the total flow, respectively. The distance between the cambium and the border between conducting and non-conducting sapwood varied from 31 to 66 mm in the various species. The radial distribution of sap velocity with azimuth around the trunk had a coefficient of variation similar to that found between trees of the same species. The amplitude of the azimuthal variation changed during the day; it was high in the mornings and evenings and low at noon. The variation of sap velocity in three azimuths was more affected by the structure of each individual trunk than by the position with respect to the sun. © 2007 Springer Science+Business Media B.V.
Scientific Publication
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