Skip to Main Content
Heat Accumulation: An Easy Way Anticipate the Flowering of Southern PinesAuthor(s): William D. Boyer
Source: Journal of Forestry Vol. 76, No. 1 January 1978
Publication Series: Miscellaneous Publication
PDF: View PDF (155 KB)
DescriptionAccumulation of degree-day heat sums accounts for most of the year-to-year variation in dates of peak pollen shed by slush (Pinus etliottii Engelm.), longleaf (P. palustris Mill.), loblolly (P. taeda L.), and shortleaf (P. echinata Mill.) pines. During 19 years of observation for longleaf cmd 6 years for each of the other species, the average deviation of observed from predicted peak date was four days or less. Slash pine had the greatest range among years in date of peak flowering (45 days), followed by longleaf (40 days), loblolly (23 days), and shortleaf (20 days). Male strobili of slash pine developed without pause, except on cold days, after their emergence in late November or early December. Longleaf, however, had a period of winter dormancy that averaged about one month, and loblolly and shortleaf were dormant about two months during winter. Only the pollen shed periods of longleaf and loblolly pines overlapped during this study. Differences in heat and dormancy requirements apparently preclude overlap between longleaf and slash pines, or between shortleaf and any of the others.
- You may send email to firstname.lastname@example.org 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.
CitationBoyer, William D. 1978. Heat Accumulation: An Easy Way Anticipate the Flowering of Southern Pines. Journal of Forestry Vol. 76, No. 1 January 1978
- Participatory genetic improvement: longleaf pine
- Genetic variation in the southern pines: evolution, migration, and adaptation following the pleistocene
- Suitability of Some Southern and Western Pines as Hosts for the Pine Shoot Beetle, Tomicus piniperda (Coleoptera: Scolytidae)
XML: View XML