Consequences of different sample drying temperatures for accuracy of biomass inventories in forest ecosystems

Abstract

Biomass estimation is one of the crucial tasks of forest ecology. Drying tree material is a crucial stage of preparing biomass estimation tools. However, at this step researchers use different drying temperatures, but we do not know how this influences accuracy of models. We aimed to assess differences in dry biomass between two drying temperatures (75 °C and 105 °C) in tree biomass components and to provide coefficients allowing for recalculation between the given temperatures. We used a set of 1440 samples from bark, branches, foliage and wood of eight European tree species: Abies alba Mill., Alnus glutinosa (L.) Gaertn., Betula pendula Roth., Fagus sylvatica L., Larix decidua Mill., Picea abies (L.) H. Karst., Pinus sylvestris L. and Quercus robur L. The differences between drying temperatures were 1.67%, 1.76%, 2.20% and 0.96% of sample dry masses of bark, branches, foliage and stem wood, respectively. Tree species influenced these differences. Our study provided coefficients allowing for recalculation of masses between the two temperatures, to unify results from different studies. However, the difference in dry mass between the two temperatures studied is lower than the range of uncertainty of biomass models, thus its influence on results of large-scale biomass assessments is low.

Evaluating different green manuring plant species and stool destruction methods for enhancing sugarcane yield at Wonji-Shoa Sugar Estate, Ethiopia

“…To account for moisture content, the weight of the trash was adjusted during each application. This adjustment was made by collecting trash samples and determining the moisture content using the method described by Jagodziński et al [ 45 ]. Cane residue (trash) blanketing was carried out from July 1–6, 2021.…”

“…The recorded value was then extrapolated to the total fresh biomass per hectare. Then, the moisture content of the fresh biomass was determined by randomly taking representative samples, weighing, and oven-drying them at 105 °C for 24 h [ 45 ]. Afterwards, the dried samples were weighed, and the moisture content (MC) was determined.…”