Skip to Main Content
Post-fertilization physiology and growth performance of loblolly pine clonesAuthor(s): N.T. King; J.R. Seiler; T.R. Fox; KurtH Johnsen
Source: Tree Physiology, Vol. 28: 703-711
Publication Series: Scientific Journal (JRNL)
PDF: Download Publication (144 KB)
DescriptionThe physiological processes leading to enhanced growth of loblolly pine (Pinus taeda L.) following fertilization are not clearly understood. Part of the debate revolves around the temporal response of net photosynthetic rate (An) to fertilization and whether the An response is always positive. We measured light-saturated photosynthetic rate (Asat), dark respiration rate, growth and crown silhouette area in eight clones of loblolly pine before and after nitrogen (N) fertilization (112 kg ha–1) to track the initial physiological changes prior to any changes in growth. Overall, there were positive photosynthetic and growth responses to fertilization; however, there were pronounced physiological and growth differences among clones, even among clones with the same parents. Clones 4, 6 and 7 showed large volume growth and Asat responses to fertilization. Clone 1 and Clone 8 (a full-sibling of Clone 7) mainly showed a volume growth response, whereas Clone 2 (full-sibling of Clone 1) showed an Asat response only. Clone 5 (full-sibling of Clone 6) showed little response to fertilization, whereas Clone 3 (full-sibling of Clone 4) showed a negative Asat response. Thus, within-family variationwarrants further study to ensure that relatively expensive clonal material is used efficiently.
- You may send email to email@example.com to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationKing, N.T.; Seiler, J.R.; Fox, T.R.; Johnsen, KurtH. 2008. Post-fertilization physiology and growth performance of loblolly pine clones. Tree Physiology, Vol. 28: 703-711
Keywordscrown area, gas exchange, net photosynthesis, nitrogen, Pinus taeda
- Leaf-level gas-exchange uniformity and photosynthetic capacity among loblolly pine (Pinus taeda L.) genotypes of contrasting inherent genetic variation
- Branch growth and gas exchange in 13-year-old loblolly pine (Pinus taeda) trees in response to elevated carbon dioxide concentration and fertilization
- Pinus taeda clones and soil nutrient availability: effects of soil organic matter incorporation and fertilization on biomass partitioning and leaf physiology
XML: View XML