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Biomasa leśna - remedium na problemy energetyczne?

Michalski Rajmund

Laboratorium - Przegląd Ogólnopolski

2023

nr 3

36--40

Dotacje w Europie na spalanie biomasy leśnej przekraczają miliardy euro rocznie, powodując systematyczny wzrost popytu na te surowce. Czy biomasa powinna być klasyfikowana jako odnawialne źródło energii (OZE)?

Mixed biomass as an alternative energy fuel

Purgał P., Pasternak J.

Structure and Environment

2016

Vol. 8, no. 4

266--272

The use of biomass as a renewable energy source is applicable in the production of electricity and heat. The main fuel is wood in the form of fragmented wood, edgings, whirlpools, wood chips, sawdust, briquettes and pellets. This publication refers to the use of waste processing aspect of the food industry, as well as ready biofuel component in mixtures with sawdust. Tests of moisture content in analytical aspect of combustion heat were conducted. Analysis of the results shows that the energy potential of waste plant is possible to use in the combustion process, thus reducing wood consumption in the power generation sector.

Nitrogen content and biomass : scaling from the tree to the forest level

Cheng D.-L., Zhong Q.-L.

Polish Journal of Ecology

2012

Vol. 60, nr 4

699--706

Nitrogen is an essential nutrient for plant growth. Although much has been learned about its utilization and distribution within the plant body, little is known about the relationship between nitrogen content and standing biomass at the level of entire forests. Data for nitrogen content (N) and biomass (M) of 10 deciduous species in USA at the individual trees level and 37 species grown in three forest biomes (i.e. tropic, subtropics, and temperate) in China at stands level were gathered to determine the N versus M scaling relationships for different tissue- and organ-types (e.g. bark and leaves). Model Type II regression protocols were used to calculate scaling exponents and allometric constants (i.e. slopes and y-intercepts of log-log bivariate plots, respectively) between N and M to. At the level of individual plants, N scaled nearly isometrically with M for the different tissue- and organ-types (i.e. N [proportionality] M [0.97–1.04]). At the stand-level, N scaled similarly with respect to leaf, branch, and bark M, despite differences in stand size-frequency distributions and species composition. However, total stand N scaled allometrically with respect to total stem or root M and thus to total stand mass (i.e. N [proportionality] M[T] [0.77–0.87]). This was attributed to the accumulation of wood (and other ‘necromass’ tissue components that have lower N content than physiologically active tissues) in progressively older (and thus more massive) tree stands. When coupled to the scaling of N with respect to annual plant growth rates, these exponents provide important boundary conditions with which to model forest nutrient cycling.