Forest stand biomass and carbon stock estimates in Latvia | Latvijas kokaudžu biomasas un oglekļa uzkrājuma novērtēšanas metodes
2020
Liepins, J., Latvian State Forest Research Inst. Silava, Salaspils (Latvia)
The present publication is a revised version of the PhD thesis “Methodology development for forest stand biomass and carbon stock estimates in Latvia”. Supervisors Dr.silv. Kaspars Liepiņš and Dr.silv. Andis Lazdiņš. Regardless the importance of the forestry sector in Latvia, the methodological basis for analysing the amount of biomass and sequestrated carbon in Latvia is still incomplete. Currently, one of the biggest drawbacks is that there are no approved and suitable biomass equations for common tree species in Latvia. Previous studies in Latvia on biomass and carbon assessment for common tree species are fragmented and limited to separate biomass fractions and several tree species. To estimate CO2 sequestration in aboveground and belowground woody biomass, accurate methods are required. This study is aimed to develop the methods for forest biomass and carbon stock assessment that are based on recommendations for national reporting. The material for study of aboveground and belowground tree biomass is collected in 124 forest stands. Three sample trees per stand have been harvested – in total 102 Scots pines, 81 Norway spruces, 105 birches and 84 European aspens, while stumps and roots of 37 Scots pines, 29 Norway spruces, 42 birches and 33 European aspens are lifted for belowground biomass studies. Accurate measurements of the stem basic density are needed to calculate total stem biomass. 14 366 stem wood and 4652 stem bark samples have been analysed to study the variation of within-the-stem basic density and to calculate the mean density of the stems. Our study approved that the basic density of stem bark significantly (p is less than 0.001) differs from stem wood density. Within our study new equations for estimation of stem, branch, and total aboveground and belowground biomass were developed for application in Latvian conditions for a wide range of tree dimensions. In accordance to the forest land definition used in national GHG reports, the total carbon stock in Latvia in year 2016 was 238.1 ±3.5 million tonnes.
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