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DOI: 10.5593/SGEM2016/HB33/S03.058

GREY ALDER (ALNUS INCANA (L.) MOENCH) STAND THINNING EFFECT IN OXALIDOSA

O. Miezite, E. Dubrovskis, J. Ruba, J. Kazerovskis
Friday 11 November 2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, SGEM Vienna GREEN Extended Scientific Sessions, www.sgemviennagreen.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-81-0 / ISSN 1314-2704, 2 - 5 November, 2016, Book 3 Vol. 3, 453-460pp, DOI: 10.5593/SGEM2016/HB33/S03.058

ABSTRACT

Grey alder occupies 214.2 thousand ha or 7.4% of the Latvian forest areas, from 2010 to 2015 the area has increased by 0.5%. Grey alder possess good natural regrowth, it is resistant to biotic and abiotic factors. It can be easily processed to firewood, woodchips and wood dries fast. Therefore it is one of significant firewood biomass obtaining tree species and more detail researches is needed. Aim of this research was to analyze grey alder stands thinning effect in Oxalidosa forest ecosystem. Research was made in six 21 year old I site index pure grey alder stands. Thinning interval for thinned stands was 6 years. In each stand were established one temporary sample plot with area of 500 m2 in stand part which better describes thinning effect. Undergrowth tree count and species in each sample plot were registered, tree diameter at breast height or DBH and stand height for 30 trees were measured. Wood bores at breast height were made for 21 dominant trees in every sample plot. Thinned stand basal area come to 16 – 26 m2 ha-1, but in natural stands 24 – 27 m2 ha-1. Tree count in thinned stands fluctuated from 2286 to 2890 pieces per ha but in natural stands from 3857 to 4500 pieces per ha. Natural pure grey alder stand average growing stock reaches 170 m3 ha-1 and in thinned stands 116 m3 ha-1. Dead wood amount in natural stands reaches 9 – 13% of growing stock but in thinned stands 1%. Thinned stand tree annual increment increased 4 – 27% comparing to natural stands. More intense thinning needed for higher diameter increment (p<0.05).

Keywords: thinning, pure stand, growth rings.

PAPER DOI: 10.5593/SGEM2016/HB33/S03.058, GREY ALDER (ALNUS INCANA (L.) MOENCH) STAND THINNING EFFECT IN OXALIDOSA

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