Effects of sylvicultural practices on nutrient status in a Pinus radiataplantation: Nutrient export by tree removal and nutrient dynamics indecomposing logging residues

摘要

The effects of logging residue management practices on export and dynamics of nutrients were studied in a plantation of Pinus radiata D. Don growing on an infertile soil, in a humid, temperate area of NW Spain. The export of nutrients due to the removal of wood and logging residues during thinning and clear-cutting was evaluated by estimation of nutrient stores in the above-ground biomass and in the soil. Nutrient dynamics in decomposing slash needles and twigs were monitored over one year in a thinned stand and in an adjacent clear-cut area. Comparison of nutrient release in decaying residues with the nutrient store in tree biomass as well as inputs via litterfall and atmosphere allowed discussion of possible implications for sustainable sylviculture in these plantations. Nutrient release from decomposing material increased following clear-cutting and to an even greater extent, after mechanical incorporation of logging residues to the mineral soil, which substantially increased the short-term flush of some nutrients.