Lowering carbon footprint of durum wheat by diversifying cropping systems

被引:169
|
作者
Gan, Yantai [1 ]
Liang, Chang [2 ]
Wang, Xiaoyu [1 ]
McConkey, Brian [1 ]
机构
[1] Agr & Agri Food Canada, Semiarid Prairie Agr Res Ctr, Swift Current, SK S9H 3X2, Canada
[2] Environm Canada, Greenhouse Gas Emiss Div, Quebec City, PQ K1A 0H3, Canada
关键词
Carbon footprint; Energy use efficiency; Crop rotation; Crop diversification; Legumes; Pulses; Oilseeds; Fertilizer use efficiency; No-till management; NORTHERN GREAT-PLAINS; PULSE CROPS; SOIL-WATER; NITROGEN; MANAGEMENT; EMISSIONS; ROTATION; COMMUNITY; TILLAGE;
D O I
10.1016/j.fcr.2011.03.020
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Improving cropping systems may help mitigate greenhouse gas emissions. This study determined the carbon footprint of durum wheat (Triticum turgidum L.) produced in diverse cropping systems. Durum was grown in rotation systems which had different combinations of oilseed, pulse, and cereal crops at five site-years in Saskatchewan, Canada. Total greenhouse gas emissions from the decomposition of crop residues along with various production inputs were used for the estimation of carbon footprint. On average, emissions from the decomposition of crop straw and roots accounted for 25% of the total emissions, those from the production, transportation, storage, and delivery of fertilizers and pesticides to farm gates and their applications 43%, and emissions from farming operations 32%. Durum wheat preceded by an oilseed crop (Brassica napus or Brassica juncea) the previous year had carbon footprint of 0.33 kg CO(2)e kg(-1) of grain, or 7% lower than durum in cereal-cereal-durum system. Durum preceded by a biological N-fixing crop (Cicer arietinum chickpea, Lens culinaris lentil, or Pisum sativum pea) the previous year lowered its carbon footprint by 17% compared with durum preceded by a cereal crop. Durum produced in a pulse-pulse-durum system had carbon footprint 0.27 kg CO(2)e kg(-1) of grain, 34% lower than durum grown in cereal-cereal-durum systems. Diversifying cropping systems with oilseeds and biological N-fixers significantly lowered carbon footprint of durum wheat. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.
引用
收藏
页码:199 / 206
页数:8
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