Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.14472 |
The greenhouse gas cost of agricultural intensification with groundwater irrigation in a Midwest US row cropping system | |
McGill, Bonnie M.1,2; Hamilton, Stephen K.1,2,3,4; Millar, Neville1,4; Robertson, G. Philip1,4,5 | |
2018-12-01 | |
发表期刊 | GLOBAL CHANGE BIOLOGY |
ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2018 |
卷号 | 24期号:12页码:5948-5960 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Groundwater irrigation of cropland is expanding worldwide with poorly known implications for climate change. This study compares experimental measurements of the net global warming impact of a rainfed versus a groundwater-irrigated corn (maize)-soybean-wheat, no-till cropping system in the Midwest US, the region that produces the majority of U.S. corn and soybean. Irrigation significantly increased soil organic carbon (C) storage in the upper 25 cm, but not by enough to make up for the CO2-equivalent (CO(2)e) costs of fossil fuel power, soil emissions of nitrous oxide (N2O), and degassing of supersaturated CO2 and N2O from the groundwater. A rainfed reference system had a net mitigating effect of -13.9 (+/- 31) g CO(2)e m(-2) year(-1), but with irrigation at an average rate for the region, the irrigated system contributed to global warming with net greenhouse gas (GHG) emissions of 27.1 (+/- 32) g CO(2)e m(-2) year(-1). Compared to the rainfed system, the irrigated system had 45% more GHG emissions and 7% more C sequestration. The irrigation-associated increase in soil N2O and fossil fuel emissions contributed 18% and 9%, respectively, to the system's total emissions in an average irrigation year. Groundwater degassing of CO2 and N2O are missing components of previous assessments of the GHG cost of groundwater irrigation; together they were 4% of the irrigated system's total emissions. The irrigated system's net impact normalized by crop yield (GHG intensity) was +0.04 (+/- 0.006) kg CO(2)e kg(-1) yield, close to that of the rainfed system, which was -0.03 (+/- 0.002) kg CO(2)e kg(-1) yield. Thus, the increased crop yield resulting from irrigation can ameliorate overall GHG emissions if intensification by irrigation prevents land conversion emissions elsewhere, although the expansion of irrigation risks depletion of local water resources. |
英文关键词 | agriculture carbon corn global change greenhouse gas groundwater intensification irrigation maize nitrous oxide soybean wheat |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000449650600028 |
WOS关键词 | ORGANIC-CARBON SEQUESTRATION ; NITROUS-OXIDE EMISSIONS ; FILLED PORE-SPACE ; UNITED-STATES ; SOIL ; WATER ; DENITRIFICATION ; FERTILIZATION ; N2O ; NITRIFICATION |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/17091 |
专题 | 气候变化 资源环境科学 |
作者单位 | 1.Michigan State Univ, WK Kellogg Biol Stn, Hickory Corners, MI 49060 USA; 2.Michigan State Univ, Dept Integrat Biol, E Lansing, MI 48824 USA; 3.Cary Inst Ecosyst Studies, Millbrook, NY USA; 4.Michigan State Univ, Great Lakes Bioenergy Res Ctr, E Lansing, MI 48824 USA; 5.Michigan State Univ, Dept Plant Soil & Microbial Sci, E Lansing, MI 48824 USA |
推荐引用方式 GB/T 7714 | McGill, Bonnie M.,Hamilton, Stephen K.,Millar, Neville,et al. The greenhouse gas cost of agricultural intensification with groundwater irrigation in a Midwest US row cropping system[J]. GLOBAL CHANGE BIOLOGY,2018,24(12):5948-5960. |
APA | McGill, Bonnie M.,Hamilton, Stephen K.,Millar, Neville,&Robertson, G. Philip.(2018).The greenhouse gas cost of agricultural intensification with groundwater irrigation in a Midwest US row cropping system.GLOBAL CHANGE BIOLOGY,24(12),5948-5960. |
MLA | McGill, Bonnie M.,et al."The greenhouse gas cost of agricultural intensification with groundwater irrigation in a Midwest US row cropping system".GLOBAL CHANGE BIOLOGY 24.12(2018):5948-5960. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论