About Us | Help Videos | Contact Us | Subscriptions

Soil Science Society of America Journal Abstract -

Effects of Clearfelling and Site Preparation on Nitrogen Mineralization in a Southern Pine Stand1


This article in SSSAJ

  1. Vol. 48 No. 6, p. 1432-1437
    Received: Nov 7, 1983
    Accepted: July 8, 1984

Request Permissions

  1. J. A. Burger and
  2. W. L. Pritchett2



A clearcut forest site (45-year-old natural stand of Pinus elliottii Engelm. and Pinus palustris Mill.) was subjected to different intensities of site preparation to determine management impacts on N availability. Using a laboratory aerobic soil incubation technique, N mineralization potentials (N mineralizable over time) (No) were determined to be 25.0, 23.3, and 17.7 µg/g for soils from an uncut control area; a burned and chopped area; and a bladed, disced, and bedded area, respectively. The No of soil from the intensively treated area was significantly lower than the others when measured in the laboratory; however, simulations of field conditions indicated that more N may be mineralized in soils from intensively treated sites due to more favorable soil moisture and temperature conditions. Mineralization rates for these three areas, however, were not significantly different, and C/N ratios (28 and 26 for the chopped and bladed sites, respectively) for the clearcut and prepared areas did not suggest a difference in N availability. Ratios of organic matter/soluble carbon (OM/Ca) increased from 79 to 136 with treatment intensity and suggest that the N associated with the organic matter remaining on the most intensively treated site may be more resistant to decomposition. Nitrogen availability is a function of substrate quality and microenvironmental conditions. Harvesting and site treatment affected both of these. Laboratory determinations of No appear to be a better index of nitrogen availability than C/N, Cs, or total N, but do not adequately account for differences in mineralization due to treatment-induced changes in the soil environment.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © . Soil Science Society of America