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Nitrogen and Family Effects on Biomass Allocation of Loblolly Pine Seedlings

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Biomass of stem, needles, and roots were determined for seedlings of 23 open-pollinated loblolly pine families alter 20 weeks' growth in a greenhouse under two nitrogen (N) levels (5 and 50 ppm). Allometric analysis was used to determine the N and family effects on the biomass allocation. Nitrogen had significant effects on seedling growth and biomass allocation to stem, needles, and roots. Low N resulted in smaller seedling size, but relatively more biomass was allocated to roots than under the high N condition. N stress generally favored biomass allocation to roots at the expense of needles or both needles and stem. Relative allocation of biomass to roots was significantly different among families with low N but not with high N. Larger seedlings exhibited greater allocation to roots possibly as a result of greater N stress. Different patterns of biomass allocation among loblolly pine families were related to their stem weight and height. Families with superior stem weight and height in both N environments had the largest root biomass proportional to seedling size in low N and had the smallest under the high N treatment. For. Sci. 37(1):271-283.

Keywords: Allometric relationships; Pinus taeda L; allocation; nitrogen stress

Document Type: Journal Article

Affiliations: Associate Professor, Department of Forestry, North Carolina State University, Raleigh, NC, 27695-8002

Publication date: March 1, 1991

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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