Imapact of full tree harvesting of thinnings on Canterbury Plains

Authors: D.J. Mead
Publication: New Zealand Journal of Forestry, Volume N.Z.J.For. 1987, Issue N.Z.J.For. 32(3) 1987, pp 12-14, Nov 1987
Publisher: New Zealand Institute of Forestry

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Abstract: Eleven-year-old Pinus radiata thinnings being harvested for fuel removed 175 kg ha-1 N when stems, branches and foliage were chipped. Harvesting eight-year-old thinnings reduced the N removed by 30% at the expense of 20% less harvested material and the chipping of 1000 instead of 400 trees. Stems contain 55-60% of the biomass (and energy) and only 25-30% of the N of the full tree. To reduce the impact of nutrient removal on these infertile sites, foliage and if possible branch material, should be left on the site. The use of fertilizers and legumes should be further investigated.

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