全球智库信息集成服务系统(G2TT): Greenhouse-gas payback times for crop-based biofuels.

G2TT

来源类型	Article
规范类型	其他
DOI	10.1038/nclimate2642
	Greenhouse-gas payback times for crop-based biofuels.
	Elshout PMF; van Zelm R; Balkovič J; Obersteiner M; Schmid E; van der Velde M; Huijbregts MAJ
发表日期	2015
出处	Nature Climate Change 5 (6): 604-610
出版年	2015
语种	英语
摘要	A global increase in the demand for crop-based biofuels may be met by cropland expansion, and could require the sacrifice of natural vegetation. Such land transformation alters the carbon and nitrogen cycles of the original system, and causes significant greenhouse-gas emissions, which should be considered when assessing the global warming performance of crop-based biofuels. As an indicator of this performance we propose the use of greenhouse-gas payback time (GPBT), that is, the number of years it takes before the greenhouse-gas savings due to displacing fossil fuels with biofuels equal the initial losses of carbon and nitrogen stocks from the original ecosystem. Spatially explicit global GPBTs were derived for biofuel production systems using five different feedstocks (corn, rapeseed, soybean, sugarcane and winter wheat), cultivated under no-input and high-input farm management. Overall, GPBTs were found to range between 1 and 162 years (95% range, median: 19 years) with the longest GPBTs occurring in the tropics. Replacing no-input with high-input farming typically shortened the GPBTs by 45 to 79%. Location of crop cultivation was identified as the primary factor driving variation in GPBTs. This study underscores the importance of using spatially explicit impact assessments to guide biofuel policy.
主题	Ecosystems Services and Management (ESM)
URL	http://pure.iiasa.ac.at/id/eprint/11463/
来源智库	International Institute for Applied Systems Analysis (Austria)
引用统计
资源类型	智库出版物
条目标识符	http://119.78.100.153/handle/2XGU8XDN/130370
推荐引用方式 GB/T 7714	Elshout PMF,van Zelm R,Balkovič J,et al. Greenhouse-gas payback times for crop-based biofuels.. 2015.