globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13263
论文题名:
Elevated atmospheric [CO2] can dramatically increase wheat yields in semi-arid environments and buffer against heat waves
作者: Fitzgerald G.J.; Tausz M.; O'Leary G.; Mollah M.R.; Tausz-Posch S.; Seneweera S.; Mock I.; Löw M.; Partington D.L.; Mcneil D.; Norton R.M.
刊名: Global Change Biology
出版年: 2016
卷: 22, 期:6
起始页码: 2269
结束页码: 2284
语种: 英语
英文关键词: Australian Grains Free Air CO2 Enrichment ; Dryland ; Elevated CO2 ; Free Air CO2 Enrichment ; Heat wave ; Wheat ; Yield
Scopus关键词: carbon dioxide ; crop yield ; dryland farming ; Mediterranean environment ; meteorological hazard ; physiological response ; semiarid region ; wheat ; Triticum aestivum ; carbon dioxide ; rain ; water ; analysis ; atmosphere ; biomass ; drought ; environmental monitoring ; food grain ; growth, development and aging ; heat ; irrigation (agriculture) ; procedures ; Victoria ; wheat ; Agricultural Irrigation ; Atmosphere ; Biomass ; Carbon Dioxide ; Droughts ; Edible Grain ; Environmental Monitoring ; Hot Temperature ; Rain ; Triticum ; Victoria ; Water
英文摘要: Wheat production will be impacted by increasing concentration of atmospheric CO2 [CO2], which is expected to rise from about 400 μmol mol-1 in 2015 to 550 μmol mol-1 by 2050. Changes to plant physiology and crop responses from elevated [CO2] (e[CO2]) are well documented for some environments, but field-level responses in dryland Mediterranean environments with terminal drought and heat waves are scarce. The Australian Grains Free Air CO2 Enrichment facility was established to compare wheat (Triticum aestivum) growth and yield under ambient (~370 μmol-1 in 2007) and e[CO2] (550 μmol-1) in semi-arid environments. Experiments were undertaken at two dryland sites (Horsham and Walpeup) across three years with two cultivars, two sowing times and two irrigation treatments. Mean yield stimulation due to e[CO2] was 24% at Horsham and 53% at Walpeup, with some treatment responses greater than 70%, depending on environment. Under supplemental irrigation, e[CO2] stimulated yields at Horsham by 37% compared to 13% under rainfed conditions, showing that water limited growth and yield response to e[CO2]. Heat wave effects were ameliorated under e[CO2] as shown by reductions of 31% and 54% in screenings and 10% and 12% larger kernels (Horsham and Walpeup). Greatest yield stimulations occurred in the e[CO2] late sowing and heat stressed treatments, when supplied with more water. There were no clear differences in cultivar response due to e[CO2]. Multiple regression showed that yield response to e[CO2] depended on temperatures and water availability before and after anthesis. Thus, timing of temperature and water and the crop's ability to translocate carbohydrates to the grain postanthesis were all important in determining the e[CO2] response. The large responses to e[CO2] under dryland conditions have not been previously reported and underscore the need for field level research to provide mechanistic understanding for adapting crops to a changing climate. © 2016 John Wiley & Sons Ltd.
资助项目: Fitzgerald, G.J. ; Victorian Department of Economic Development, Jobs, Transport and Resources, Private Bag 260, Australia ; 电子邮件: glenn.fitzgerald@ecodev.vic.gov.au
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61376
Appears in Collections:影响、适应和脆弱性

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作者单位: Victorian Department of Economic Development, Jobs, Transport and Resources, Private Bag 260, Horsham, VIC, Australia; Department of Forest and Ecosystem Science, The University of Melbourne, 4 Water Street, Creswick, VIC, Australia; Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, 4 Water Street, Creswick, VIC, Australia; Centre for Crop Health, University of Southern Queensland, Toowoomba, QLD, Australia; Dodgshun Medlin Agricultural Management, 348 Campbell St, Swan Hill, VIC, Australia; Victorian Department of Economic Development, Jobs, Transport and Resources, Hamilton Centre, Mount Napier Road, Hamilton, VIC, Australia; Tasmanian Institute of Agriculture, Private Bag 98, Hobart, TAS, Australia; International Plant Nutrition Institute, 54 Florence St, Horsham, VIC, Australia

Recommended Citation:
Fitzgerald G.J.,Tausz M.,O'Leary G.,et al. Elevated atmospheric [CO2] can dramatically increase wheat yields in semi-arid environments and buffer against heat waves[J]. Global Change Biology,2016-01-01,22(6)
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