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This article in SSSAJ

  1. Vol. 30 No. 1, p. 114-119
     
    Received: Jan 18, 1965
    Published: Jan, 1966


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doi:10.2136/sssaj1966.03615995003000010037x

The Characterization of Dry Matter and Nitrogen Accumulation by Loblolly Pine (Pinus taeda L.)1

  1. G. L. Switzer,
  2. L. E. Nelson and
  3. W. H. Smith2

Abstract

Abstract

Fifty trees, equally distributed to represent five tree developmental stages were sampled in central Mississippi on uplands and bottomlands having average site indices of 65 and 105, respectively. Trees were divided into seven components and the dry matter and total nitrogen contents of each determined. The total dry weight and the N accumulated in a 60-year old good site stand was ca. 227,000 and 232 lb/acre, respectively, Comparable weights for the poor site are 152,000 and 194 lb. Calculations indicate in pure even-aged, natural stands on both sites that the dry weight of the foliage, current branches and stembark becomes relatively constant between 20 and 30 years while subsequent increases are chiefly older branches and stemwood. The pattern of N accumulation closely follows canopy development on both sites although in later life a considerable portion is accumulated in the stemwood.

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