M. Daugaviete, A. Korica
Monday 5 August 2013 by Libadmin2013

References: 13th SGEM GeoConference on Water Resources. Forest, Marine And Ocean Ecosystems, www.sgem.org, SGEM2013 Conference Proceedings, ISBN 978-619-7105-02-5 / ISSN 1314-2704, June 16-22, 2013, 797 - 804 pp


To increase the profitability of forestry, in many countries the most advanced forest utilization technologies provide for full tree biomass removal from forest, thus utilizing both wood and non-wood components of tree biomass. Of importance here is the impact of full tree biomass utilization on forest productivity in the ensuing rotation cycle. The views of forestry experts on this problem differ from a) full biomass removal significantly affects the productivity of future forest to b) full biomass removal has no significant impact on the productivity of future forest.
Reported here is a case study on variations in the content of individual nutrient substances in the soil, ground vegetation, and tree biomass components, comparing the impact of full tree biomass and stem removal technologies on mineral nutrient availability for pine and spruce re-established in the cutovers where forest was utilized following the said technologies.
The field data analyzed refers to the volume of tree biomass removed from the cutting area and the nutrient content in biomass under the conditions of Latvia. The amount of mineral substances removed from forest is compared with the content of these substances in 0-20cm deep soil layer.
Data analyses allow a conclusion that under the forest growing conditions of Latvia full tree biomass removal from the cutting area involves no substantial risks for the forest productivity over the ensuing rotation cycle, while more in-depth studies are needed.
In Latvia, in spruce stands at the cutting age the mean volume of stemwood is as high as 280m³·ha-1, for pine 260m³·ha-1.
Studies on tree foliage utilization show 1m³ of spruce stemwood harvested to yield 100±20kg of foliage and 80±10kg for pine. It means that by using full tree technologies in final cuttings we remove from spruce stands 28t·ha-1 of foliage once in 60-70 years,and from pine stands - 21t·ha-1 once in 100-120 years.
Data analyses show that in spruce stands the nutrient depletion is highest for N (13.4% from its content in 0-20cm layer of soil), followed by P (2.22%) and K (3.87%), with the same indices for pine 9.82%, 0.98 %, and 3.42%, respectively. It suggests that the amount of foliage removed from the stands of both spruce and pine has no significant impact on the productivity of future forest.

Keywords: full tree biomass utilization; tree foliage; turnover of mineral substances; Scots pine Pinus sylvestris L; Norway spruce Picea abies. (L) Karst.

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