DOI: 10.1111/gcb.14052
Scopus记录号: 2-s2.0-85042202124
论文题名: Benefits of increasing transpiration efficiency in wheat under elevated CO2 for rainfed regions
作者: Christy B. ; Tausz-Posch S. ; Tausz M. ; Richards R. ; Rebetzke G. ; Condon A. ; McLean T. ; Fitzgerald G. ; Bourgault M. ; O'Leary G.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 5 起始页码: 1965
结束页码: 1977
语种: 英语
英文关键词: climate change
; vapor pressure deficit
; water use efficiency
Scopus关键词: Triticum aestivum
英文摘要: Higher transpiration efficiency (TE) has been proposed as a mechanism to increase crop yields in dry environments where water availability usually limits yield. The application of a coupled radiation and TE simulation model shows wheat yield advantage of a high-TE cultivar (cv. Drysdale) over its almost identical low-TE parent line (Hartog), from about −7 to 558 kg/ha (mean 187 kg/ha) over the rainfed cropping region in Australia (221–1,351 mm annual rainfall), under the present-day climate. The smallest absolute yield response occurred in the more extreme drier and wetter areas of the wheat belt. However, under elevated CO2 conditions, the response of Drysdale was much greater overall, ranging from 51 to 886 kg/ha (mean 284 kg/ha) with the greatest response in the higher rainfall areas. Changes in simulated TE under elevated CO2 conditions are seen across Australia with notable increased areas of higher TE under a drier climate in Western Australia, Queensland and parts of New South Wales and Victoria. This improved efficiency is subtly deceptive, with highest yields not necessarily directly correlated with highest TE. Nevertheless, the advantage of Drysdale over Hartog is clear with the benefit of the trait advantage attributed to TE ranging from 102% to 118% (mean 109%). The potential annual cost-benefits of this increased genetic TE trait across the wheat growing areas of Australia (5 year average of area planted to wheat) totaled AUD 631 MIL (5-year average wheat price of AUD/260 t) with an average of 187 kg/ha under the present climate. The benefit to an individual farmer will depend on location but elevated CO2 raises this nation-wide benefit to AUD 796 MIL in a 2°C warmer climate, slightly lower (AUD 715 MIL) if rainfall is also reduced by 20%. © 2018 The Authors. Global Change Biology Published by John Wiley & Sons Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110427
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Economic Development, Jobs, Transport and Resources, Agriculture Victoria Research, Rutherglen, VIC, Australia; School of Agriculture and Food, The University of Melbourne, Creswick, VIC, Australia; CSIRO, Canberra, ACT, Australia; Department of Economic Development, Jobs, Transport and Resources, Agriculture Victoria Research, Horsham, VIC, Australia; School of Biosciences, The University of Birmingham, Edgbaston, Birmingham, United Kingdom; Montana State University Northern Agricultural Research Station, Havre, MT, United States
Recommended Citation:
Christy B.,Tausz-Posch S.,Tausz M.,et al. Benefits of increasing transpiration efficiency in wheat under elevated CO2 for rainfed regions[J]. Global Change Biology,2018-01-01,24(5)