Forest stand biomass and carbon stock estimates in Latvia | Kokaudžu biomasas un oglekļa uzkrājuma aprēķini Latvijā
2019
Liepins, J., Latvian State Forest Research Inst. Silava, Salaspils (Latvia) | Lazdins, A., Latvian State Forest Research Inst. Silava, Salaspils (Latvia) | Liepins, K., Latvian State Forest Research Inst. Silava, Salaspils (Latvia)
Accounting of the carbon stock has to be implemented using internationally approved methods that are adapted for local conditions. Previous studies in Latvia on forest biomass and carbon assessment are fragmented and limited to separate biomass components and tree species. The study material included a total of 102 Scots pine (Pinus sylvestris), 81 Norway spruce (Picea abies), 105 birch (Betula spp.) and 84 European aspen (Populus tremula) trees sampled in 124 forest stands, while 37 pines, 29 spruces, 42 birches and 33 aspens are lifted for belowground biomass studies. Wood (14366) and bark (4652) samples have been analysed to study the variation of within-the-stem basic density and to calculate the stem biomass. Study approved that the basic density of stem bark significantly (p is less than 0.001) differed from the stem wood. The use of mean stem wood density instead of whole stem density leads to biased estimation of stem biomass (1.5–4.5% error depending on tree species). Within study equations for estimation of aboveground and belowground biomass were developed. The uses of equations applied for biomass estimation in Fennoscandia in Latvia are creating 4.7–61.7% error depending on tree species and biomass component. Application of default biomass expansion factors and root to shoot ratios for temperate and boreal forests defined in IPCC guidelines creates an overestimation of 36.9% and an underestimation of 5.2%, respectively in comparison to methodology elaborated in this study. According to the forest definition used in national IPCC reports, the forest carbon stock in Latvia in year 2016 was 238.1±3.5 million tonnes.
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