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Cellulosic ethanol production: Landscape scale net carbon strongly affected by forest decision making

CSS Publication Number
CSS15-30
Full Publication Date
December 2015
Abstract

In producing cellulosic ethanol as a renewable biofuel from forest biomass, a tradeoff exists between the displacement of fossil fuel carbon (C) emissions by biofuels and the high rates of C storage in aggrading forest stands. To assess this tradeoff, the landscape area affected by feedstock harvest must be considered, which depends on numerous factors including forest productivity, the amount of forest in a fragmented landscape, and the willingness of forest landowners to sell timber as a bioenergy feedstock. We studied landscape scale net C balance by combining these considerations in a new, basic simulation model, CEBRAM, and applying it to a hypothetical landscape of short-rotation aspen forests in northern Michigan, USA. The model was parameterized for forest species, growth and ecosystem C storage, as well as landscape spatial patterns of forest cover in this region. To understand and parameterize forest owner decision making we surveyed 505 nonindustrial private forest (NIPF) owners in Michigan. Survey results indicated that 47% of these NIPF owners would willingly harvest forest biomass for bioenergy. Model results showed that at this rate the net C balance was 0.024 kg/m2 for a cellulosic ethanol system without considering land use over a 40 year time horizon. When C storage in aggrading, nonparticipating NIPF land was included, net C balance was 1.09 kg/m2 over 40 years. In this region, greater overall C gains can be realized through aspen forest aggradation than through the displacement of gasoline by cellulosic ethanol produced from forest biomass.

Co-Author(s)
Anna Brunner
William Currie
Research Areas
Energy
Energy Systems
Keywords
Carbon Accounting, Cellulosic Ethanol, Decision Making, Life Cycle Analysis, Simulation Model, Survey
Publication Type
Journal Article
Digital Object Identifier
https://doi.org/10.1016/j.biombioe.2015.08.002
Full Citation
Brunner A, Currie WS, Miller SA. (2015) “Cellulosic ethanol production: landscape scale net carbon strongly affected by forest decision making.” Biomass and Bioenergy 83: 32-41.