Harvesting Carbon from Eastern US Forests: Opportunities and Impacts of an Expanding Bioenergy Industry

Forests

Sarah C. Davis²  Michael Dietze²  Evan DeLucia²  Chris Field⁵  Steven P. Hamburg¹  Scott Loarie⁵  William Parton⁷  Matthew Potts⁴  Benjamin Ramage⁴  Dan Wang³  Heather Youngs⁶ 

[1] Environmental Defense Fund, Boston, MA 02108, USA;Department of Plant Biology, University of Illinois Urbana-Champaign, Urbana, IL 61820, USA;Energy Biosciences Institute, University of Illinois Urbana-Champaign, Urbana, IL 61820, USA;Department of Environmental Science Policy and Management, University of California Berkeley, Berkeley, CA 94720, USA;Department of Global Ecology, Carnegie Institute for Science, Stanford, CA 94305, USA;Energy Biosciences Institute, University of California Berkeley, Berkeley, CA 94720, USA;Natural Resources Ecology Laboratory, Colorado State University, Fort Collins, CO 80521, USA;

关键词: biofuel;    woody biomass;    forest management;    residue;    logging;    temperate forest;    sustainability;    CHP;    greenhouse gas reduction;    carbon dioxide emission;    carbon sequestration;   

DOI  :  10.3390/f3020370

来源: mdpi

【 摘 要 】

Eastern forests of the US are valued both as a carbon sink and a wood resource. The amount of biomass that can be harvested sustainably from this biome for bioenergy without compromising the carbon sink is uncertain. Using past literature and previously validated models, we assessed four scenarios of biomass harvest in the eastern US: partial harvests of mixed hardwood forests, pine plantation management, short-rotation woody cropping systems, and forest residue removal. We also estimated the amount and location of abandoned agricultural lands in the eastern US that could be used for biomass production. Greater carbon storage was estimated to result from partial harvests and residue removals than from plantation management and short-rotation cropping. If woody feedstocks were cultivated with a combination of intensive management on abandoned lands and partial harvests of standing forest, we estimate that roughly 176 Tg biomass y⁻¹ (~330,000 GWh or ~16 billion gallons of ethanol) could be produced sustainably from the temperate forest biome of the eastern US. This biomass could offset up to ~63 Tg C y⁻¹ that are emitted from fossil fuels used for heat and power generation while maintaining a terrestrial C sink of ~8 Tg C y⁻¹.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.