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International Journal of Forestry Research
Volume 2011 (2011), Article ID 761532, 10 pages
http://dx.doi.org/10.1155/2011/761532
Research Article

Effect of Thinning and Harvest Type on Storage and Losses of Phosphorous in Pinus taeda L. Plantations in Subtropical Argentina

1Estación Experimental Agropecuaria Montecarlo, INTA Avendia El Libertador 2472, 3384 Montecarlo, Misiones, Argentina
2LISEA, Universidad Nacional de La Plata, CC 31, 1900 La Plata, Argentina

Received 30 November 2010; Accepted 23 March 2011

Academic Editor: Philip Comeau

Copyright © 2011 Rodolfo Andrés Martiarena et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The aim of this study was to evaluate the effect of thinning intensity and different harvest types on ecosystem P conservation in 20-year-old Pinus taeda plantation ecosystems at Misiones province, Argentina. The plantation was established in 1985, thinned at three intensities—0, 33, and 66% of basal area of control plots removed by thinning—and harvested in 2005. The nutrient content at harvest was determined for tree, shrub, and herb layers, the forest floor and upper mineral soil. Two harvest types were simulated: stem only and whole tree. Total P content was 56.8, 46.8, and 38.6 kg· ha−1 for 0, 33, and 66% thinning, respectively. Total P exported by harvest was different among treatments, the highest at 0% thinning treatment. Phosphorus stability index values indicated that the P most conservative management option is 66% thinning, harvest of stem only and retention of forest floor, understory, and harvest residues.