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The Characterization of Dry Matter and Nitrogen Accumulation by Loblolly Pine (Pinus taeda L.) on Poor Sites¹

ABSTRACT

Twenty-five trees, equally distributed to represent five tree developmental stages, were sampled on uplands with a site index of 65 feet in central Mississippi. The aerial portion of the trees was divided into seven components and dry matter and total nitrogen contents of each determined. The pattern of dry matter accumulation by the individual trees and stands through the series of developmental stages differs. The individual tree and all its parts make accretions throughout development, while some portions of the stands reach a fairly constant level at 23 years. At 60 years the stand contained 126,000 pounds of dry matter per acre of which 56% was accumulated during the first 23 years.

The pattern of nitrogen accumulation within the individual tree and its parts is similar to that of dry matter while for the stand the similarity is not so striking. This variation is chiefly brought about by the variations in crown and canopy development. At 60 years a standing crop contained approximately 170 pounds of N per acre of which 77% was accumulated during the first 23 years.

¹ Journal Contribution No. 1035 of the Mississippi Agr. Exp. Sta., State College. Presented before Div. V-A, Soil Science Society of America, Aug. 22, 1962. Ithaca, N. Y. This work was supported in part by a grant from the National Plant Food Institute.

² National Defense Education Act Fellow, Agronomist, and Associate Forester, respectively, Mississippi Agr. Exp. Sta., State College.