You are here: Home
/ Publication Information
Title: Photosynthesis and Biomass Allocation in Oak Seedlings Grown Under Shade
Author: Sung, Shi-Jean S.; Kormanik, Paul P.; Zarnoch, Stanley J.;
Source: Proceedings of the Ninth Biennial Southern Silvicultural Reasearch Conference. USDA Forest Service. June 1998
Publication Series: Miscellaneous Publication
Description: Abstract-Northern red oak (Quercus rubra L.) (NRO) and white oak (Q. alba L.) (WO) acorns were sown into wooden plots and grown under 30 percent shade screen (30 percent S) or 70 percent shade screen (70 percent S). Seedlings grown under full sun were the controls (C). At the end of the first year, the 30 percent S NRO had 30 percent greater seedling dry weight (DW) than C seedlings. No growth differences existed between these two treatments after 2 years. Compared to C, 70 percent S NRO had a 40 percent lower net photosynthetic rate (A), twofold less seedling DW and leaf number, and fourfold less lateral root DW after 2 years. Dry weight biomass allocation to lateral roots increased from 17 percent at the end of the first growing season to 22 percent after 2 years for both the C and 30 percent S NRO. The 70 percent S seedlings, however, allocated only 8 percent DW to lateral roots for both years. White oak seedlings responded similarly to shade as NRO seedlings. The 70 percent S WO had 30 percent lower A and fourfold less lateral root DW than the controls after 2 years. At the end of the second year, DW biomass allocation to lateral roots was 12, 7, and 5 percent, respectively, for C, 30 percent S, and 70 percent S WO seedlings. The impact of shade (reduced light intensity) on seedling growth of both oak species was discussed in terms of A, photoprotection, and DW biomass allocation.
- 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.
- 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.)
XML: View XML
Sung, Shi-Jean S.; Kormanik, Paul P.; Zarnoch, Stanley J. 1998. Photosynthesis and Biomass Allocation in Oak Seedlings Grown Under Shade. Proceedings of the Ninth Biennial Southern Silvicultural Reasearch Conference. USDA Forest Service. June 1998
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility