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Biomass conversion and expansion factors are afected by thinning
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Orientador(es)
Resumo(s)
Aim of the study: The objective of this paper is to investigate the use of Biomass Conversion and Expansion Factors
(BCEFs) in maritime pine (Pinus pinaster Ait.) stands subjected to thinning.
Area of the study: The study area refers to different ecosystems of maritime pine stands in Northern Portugal.
Material and methods: The study is supported by time data series and cross sectional data collected in permanent
plots established in the North of Portugal. An assessment of BCEF values for the aboveground compartments and for
total was completed for each studied stand. Identification of key variables affecting the value of the BCEFs in time
and with thinning was conducted using correlation analysis. Predictive models for estimation of the BCEFs values in
time and after thinning were developed using nonlinear regression analysis.
Research highlights: For periods of undisturbed growth, the results show an allometric relationship between the
BCEFs, the dominant height and the mean diameter. Management practices such as thinning also influence the factors.
Estimates of the ratio change before and after thinning depend on thinning severity and thinning type. The developed
models allow estimating the biomass of the stands, for the aboveground compartments and for total, based on information
of stand characteristics and of thinning descriptors. These estimates can be used to assess the forest dry wood stocks
to be used for pulp, bioenergy or other purposes, as well as the biomass quantification to support the evaluation of the
net primary productivity
Descrição
Palavras-chave
carbon softwood thinning volume wood energy maritime pine Pinus pinaster
Contexto Educativo
Citação
Forest Systems 2014 23(3): 438-447
Editora
INIA