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Record |
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Author |
Bosc, A.; De Grandcourt, A.; Loustau, D. |
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Title |
Variability of stem and branch maintenance respiration in a Pinus pinaster tree |
Type |
Journal Article |
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Year |
2003 |
Publication |
Tree Physiology |
Abbreviated Journal |
Tree Physiol. |
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Volume  |
23 |
Issue |
4 |
Pages |
227-236 |
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Keywords |
model; nitrogen; phloem; sapwood; temperature |
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Abstract |
The relationship between maintenance respiration (R.) of woody organs and their structural characteristics was explored in adult Pinus pinaster Ait. trees. We measured R-m on 75 stem and branch segments of different ages (from 3 to 24 years) and diameters (from 1 to 35 cm). The temperature response of R-m was derived from field measurements based on a classical exponential function with Q(10) = 2.13. Relationships between R-m and the dimensions of the woody organs were analyzed under controlled conditions in the laboratory. The surface area of a woody organ was a better predictor of R-m than volume, but surface area failed to account for the observed within-tree variability of R-m among stems, branches and twigs. Two simple models were proposed to predict the variability of R-m at 15 degreesC in an adult tree. Model 1, a linear function model based on the dry mass and nitrogen concentration of sapwood and phloem tissues, explained most of the variability of R-m in branches and stems (R-2 = 0.97). We concluded that the respective contributions of the phloem and sapwood depend on the location and diameter of the woody organ. Model 2, a power-law function model based on the length, diameter and age of the sample, explained the same variance of R-m as Model 1 and is appropriate for scaling R-m to the stand level. Models 1 and 2 appear to explain a larger variability of R-m than models based on stem area or sapwood mass. |
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Address |
INRA, F-33612 Cestas, France, Email: alexandre.bosc@pierroton.inra.fr |
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Publisher |
HERON PUBLISHING |
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Edition |
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ISSN |
0829-318X |
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Notes |
ISI:000181841200002 |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
246 |
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