Using an energetic and exergetic life cycle analysis to assess the best applications of legumes within a biobased economy

被引:23
作者
Brehmer, Ben [1 ]
Struik, Paul C. [2 ]
Sanders, Johan [1 ]
机构
[1] Wageningen UR, NL-6708 PD Wageningen, Netherlands
[2] Wageningen UR, Crop & Weed Ecol Grp, NL-6709 RZ Wageningen, Netherlands
关键词
LCA; Exergy; Energy; Land use efficiency; Legumes; Solar radiation; Fertilizers;
D O I
10.1016/j.biombioe.2008.02.015
中图分类号
S2 [农业工程];
学科分类号
0828 ;
摘要
in symbiosis with bacteria, legumes are able to biologically fix nitrogen from the atmosphere and therefore require less artificial nitrogen fertilizer. As the manufacturing of nitrogen fertilizers demands a lot of process energy, growing legumes may give large overall energy savings. The reduction of nitrogen fertilizer, however, gives a yield loss as the carbon-to-nitrogen efficiency is lower for inoculation than for the synthetic process. When brought into the realm of biomass for bioenergy, the energy savings obtained through less fertilizer input must be balanced with the loss of potential yield output. Twelve popular choice crops (including two legumes, two crops grown in mixture with legumes and one crop associated with mycorrhiza) were chosen to investigate the relationship between solar radiation input, fertilizer input and the resulting potential bioenergy output. A cradle-to-factory gate assessment was performed with cumulative energy and exergy values as the main indicators. The trade-off between lower fertilizer energy inputs to utilized solar radiation was assessed. Combined they relate to the land use efficiency, basically the energy relations per hectare. Our analysis shows that legumes do not present energy savings and do not contribute to sustainability when grown as bioenergy crops. The benefits of nitrogen fixation by legumes should be carefully assessed and best utilized within the emerging sector of non-food applications. (C) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1175 / 1186
页数:12
相关论文
共 24 条
[1]  
ATKINS CA, 1984, PLANT SOIL, V82, P273, DOI 10.1007/BF02184267
[2]   BIOLOGICAL NITROGEN-FIXATION ASSOCIATED WITH SUGAR-CANE [J].
BODDEY, RM ;
URQUIAGA, S ;
REIS, V ;
DOBEREINER, J .
PLANT AND SOIL, 1991, 137 (01) :111-117
[3]   Energetic and exergetic life cycle analysis to explain the hidden costs and effects of current sulphur utilisation [J].
Brehmer, Ben ;
Sanders, Johan .
INTERNATIONAL JOURNAL OF EXERGY, 2007, 4 (02) :117-133
[4]   Evaluation of switchgrass rhizosphere microflora for enhancing seedling yield and nutrient uptake [J].
Brejda, JJ ;
Moser, LE ;
Vogel, KP .
AGRONOMY JOURNAL, 1998, 90 (06) :753-758
[5]  
CREWS TE, 2003, ECOSYSTEMS ENV, V201, P279
[6]  
Duffy M. D., 2002, Trends in new crops and new uses. Proceedings of the Fifth National Symposium, Atlanta, Georgia, USA, 10-13 November, 2001, P267
[7]  
DUKE A, HDB ENERGY CROPS
[8]  
*EFMA, 2000, 2 8 PROD NITR AC
[9]  
*EFMA, 2000, 3 8 PROD SULPH AC, P42
[10]   Interactions between perennial ryegrass (Lolium perenne L.) and white clover (Trifolium repens L.) under contrasting nitrogen availability:: productivity, seasonal patterns of species composition, N2 fixation, N transfer and N recovery [J].
Elgersma, A ;
Schlepers, H ;
Nassiri, M .
PLANT AND SOIL, 2000, 221 (02) :281-299