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Effects of temperature and tissue nitrogen on dormant season stem and branch maintenance respiration in a young loblolly pine (Pinus taeda) plantationAuthor(s): Chris A. Maier; Stanley J. Zarnoch; P.M. Dougherty
Source: Tree Physiology 18, 11-20
Publication Series: Miscellaneous Publication
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DescriptionSummary We measured dormant season (November through February) maintenance respiration rates (Rm) in stems and branches of 9-year-old loblolly pine (Pinus taeda L.) growing in plots under conditions of controlled nutrient and water supply in an effort to determine the relationships between Rm and tissue size (surface area, sapwood volume, sapwood dry weight), tissue nitrogen content and temperature. Dormant season Rm per unit size (i.e., surface area, µmol m-2 s-1; sapwood volume, µmol m-3 s-1; or sapwood dry weight, nmol g-1 s-1) varied with tissue size, but was constant with respect to tissue nitrogen content (µmol mol-1 N s-1 ). Cambium temperature accounted for 61 and 77% of the variation in stem and branch respiration, respectively. The basal respiration rate (respiration at 0°C) increased with tissue nitrogen content, however, the Q10 did not. Improved nutrition more than doubled stem basal respiration rate and increased branch basal respiration by 38%. Exponential equations were developed to model stem and branch respiration as a function of cambium temperature and tissue nitrogen content. We conclude that failure to account for tissue nitrogen effects on respiration rates will result in serious errors when estimating annual maintenance costs.
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CitationMaier, Chris A.; Zarnoch, Stanley J.; Dougherty, P.M. 1998. Effects of temperature and tissue nitrogen on dormant season stem and branch maintenance respiration in a young loblolly pine (Pinus taeda) plantation. Tree Physiology 18, 11-20
Keywordscarbon balance, productivity, temperature-nitrogen model of maintenance respiration, tissue nutrition, woody tissue
- Stem growth and respiration in loblolly pine plantations differing in soil resource availability
- Seasonal respiration of foliage, fine roots, and woody tissues in relation to growth, tissue N, and photosynthesis
- Relationship between stem CO2 efflux, stem sap velocity and xylem CO2 concentration in young loblolly pine trees
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