Tree biomass structure of spruce forest in Latvia

Empirical data of 21 sample trees from spruce stands of various growth conditions (site index – Ia, I, and II, stand density – 0.6-0.8, different age classes and tree species composition) were collected. The research material comprised biomass of such forest stand fractions as branches, needles, stu...

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Bibliographic Details
Published inRaksti no. 20
Main Authors Liepa, I., Latvia Univ. of Agriculture, Jelgava (Latvia). Forest Faculty. Dept. of Silviculture, Blija, T., Latvia Univ. of Agriculture, Jelgava (Latvia). Forest Faculty. Dept. of Silviculture
Format Journal Article
LanguageLatvian
Published 2008
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Summary:Empirical data of 21 sample trees from spruce stands of various growth conditions (site index – Ia, I, and II, stand density – 0.6-0.8, different age classes and tree species composition) were collected. The research material comprised biomass of such forest stand fractions as branches, needles, stumps, and roots. To calculate biomass values of tree fractions, values of expansion factor ci were estimated. Following factors were obtained (arithmetic mean +- standard error): for branches – cz = 0.13539+-0.01453, for needles – cSk = 0.13939+-0.02185, for stumps – cC = 0.07095+-0.00451, for roots – cS = 0.17905+-0.01577, and common for all non-stem fractions – i Sumc = 0.52478+-0.03945. The amount of stem biomass was calculated using formula (1), but biomass of non-stem fractions – as a multiplication of stand volume and corresponding expansion factor. On January 1, 2005, total biomass amount of spruce forests was 117.095 million t from which stem fraction made up 60.2%, but non-stem fraction – 39.8%. As to non-stem fraction, branches made up 10.3%, needles – 10.6%, stumps – 5.3%, and roots – 13.6% from the total amount of biomass. These data were suggested to be an additional reserve for forest resources utilization and reliable possibility to evaluate the amount of carbon accumulated in spruce forests.
Bibliography:http://llufb.llu.lv/proceedings/n20/3/LLU-proceeding-nr20-32-37.pdf
K10
T/547 Call number
ISSN:1407-4427
2255-8535