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Soil Science Society of America Journal Abstract -

Weight and Nitrogen, Phosphorus, Potassium, and Calcium Content of Forest Floor Humus of Lodgepole Pine Stands in Colorado1


This article in SSSAJ

  1. Vol. 33 No. 1, p. 137-140
    Received: Mar 4, 1968
    Accepted: Sept 17, 1968

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  1. W. H. Moir and
  2. H. Grier2



The pine-derived organic matter of the forest floor was sampled by horizon from eight Pinus contorta stands of contrasting densities, site indices, average dbh, and stand height. Tabular data are given for loss-on-ignition, mineral and ash content, and N, P, K, and Ca content of these horizons. Total quantities of forest floor humus ranged from 2.54 to 4.21 kg/m2 irrespective of stand density. Expressed as g/m2 the N content of the forest floor humus ranged from 31–54, P from 2–5, K from 7–17, and Ca from 10–25. The proportion of N increased with progressive decomposition of organic material. The most mobile nutrients, K and P, were generally most concentrated in the lowest of the four forest floor humus horizons whereas Ca concentrations differed little among each of the horizons.

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