Paper details

Title:

Nutrient Removal after Whole-Tree Harvesting with the Traditional Swedish Dried-Stacked Method for Removal of Logging Residues

Author(s):

Nilsson, D., Nilsson, B., Thörnqvist, T.

Document(s):

Abstract:

Bioenergy from logging residues is an important contributor to Swedish energy supplies. Logging residues where long defined and regarded as the unmerchantable aboveground biomass left behind in the clear-felled area, consisting of branches, tops and small trees that are gathered after the round wood harvest, but logging residues are nowadays regarded as a third assortment next to timber and pulpwood with high economic value. However long­term experiments on removal of logging residues from Norway spruce (Picea abies (L.)Karst) stands have shown both growth reductions and growth increase in the next generation, because of decreasing amounts of nutrients. So an increased removal of logging residues requires some sort of compensation of nutrients. Therefore it is of importance to investigate how much nutrients that is removed from the stand after whole-tree harvesting. In this study the removal of the nutrients nitrogen (N), phosphorus (P), calcium (Ca), potassium (K) and magnesium (Mg) have been investigated by laboratory analysis of the nutrients together with the actual removal of stemwood, bark and logging residues. The study has also investigated the distribution of nutrients at the clear-felled area. The results show that approximately half of the total nutrient removed in whole tree harvesting is done with the removal of stemwood and bark. The results also show that approximately 30% of the total amount of nutrients is left at the clear-felled area.

Keywords:

forest residues, forestry, harvesting

Topic:

Biomass Resources

Subtopic:

Biomass potentials and biomass mobilisation

Event:

23rd European Biomass Conference and Exhibition

Session:

1AO.1.2

Pages:

9 - 13

ISBN:

978-88-89407-516

Paper DOI:

10.5071/23rdEUBCE2015-1AO.1.2

Price:

FREE