DOI: 10.1111/gcb.12155
论文题名: Future carbon dioxide concentration decreases canopy evapotranspiration and soil water depletion by field-grown maize
作者: Hussain M.Z. ; Vanloocke A. ; Siebers M.H. ; Ruiz-Vera U.M. ; Cody Markelz R.J. ; Leakey A.D.B. ; Ort D.R. ; Bernacchi C.J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 5 起始页码: 1572
结束页码: 1584
语种: 英语
英文关键词: Canopy temperature
; Elevated [CO2]
; Evapotranspiration
; Maize
; Sensible heat
; Soil moisture
Scopus关键词: carbon dioxide
; water
; canopy
; carbon dioxide
; evapotranspiration
; maize
; photosynthesis
; sensible heat flux
; soil moisture
; soil water
; soybean
; temperature effect
; article
; chemistry
; circadian rhythm
; climate change
; energy metabolism
; evapotranspiration
; maize
; metabolism
; photosynthesis
; physiology
; plant leaf
; season
; soil
; time
; United States
; Carbon Dioxide
; Circadian Rhythm
; Climate Change
; Energy Metabolism
; Illinois
; Photosynthesis
; Plant Leaves
; Plant Transpiration
; Seasons
; Soil
; Time Factors
; Water
; Zea mays
; Illinois
; United States
; Urbana
; Glycine max
; Zea mays
英文摘要: Maize, in rotation with soybean, forms the largest continuous ecosystem in temperate North America, therefore changes to the biosphere-atmosphere exchange of water vapor and energy of these crops are likely to have an impact on the Midwestern US climate and hydrological cycle. As a C4 crop, maize photosynthesis is already CO2-saturated at current CO2 concentrations ([CO2]) and the primary response of maize to elevated [CO2] is decreased stomatal conductance (gs). If maize photosynthesis is not stimulated in elevated [CO2], then reduced gs is not offset by greater canopy leaf area, which could potentially result in a greater ET reduction relative to that previously reported in soybean, a C3 species. The objective of this study is to quantify the impact of elevated [CO2] on canopy energy and water fluxes of maize (Zea mays). Maize was grown under ambient and elevated [CO2] (550 μmol mol-1 during 2004 and 2006 and 585 μmol mol-1 during 2010) using Free Air Concentration Enrichment (FACE) technology at the SoyFACE facility in Urbana, Illinois. Maize ET was determined using a residual energy balance approach based on measurements of sensible (H) and soil heat fluxes, and net radiation. Relative to control, elevated [CO2] decreased maize ET (7-11%; P < 0.01) along with lesser soil moisture depletion, while H increased (25-30 W m-2; P < 0.01) along with higher canopy temperature (0.5-0.6 °C). This reduction in maize ET in elevated [CO2] is approximately half that previously reported for soybean. A partitioning analysis showed that transpiration contributed less to total ET for maize compared to soybean, indicating a smaller role of stomata in dictating the ET response to elevated [CO2]. Nonetheless, both maize and soybean had significantly decreased ET and increased H, highlighting the critical role of elevated [CO2] in altering future hydrology and climate of the region that is extensively cropped with these species. © 2013 Blackwell Publishing Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62460
Appears in Collections: 影响、适应和脆弱性
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作者单位: Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, United States; Department of Atmospheric Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, United States; Department of Plant Biology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, United States; Global Change and Photosynthesis Research Unit, United States Department of Agriculture, Agricultural Research Service, Urbana, IL, 61801, United States
Recommended Citation:
Hussain M.Z.,Vanloocke A.,Siebers M.H.,et al. Future carbon dioxide concentration decreases canopy evapotranspiration and soil water depletion by field-grown maize[J]. Global Change Biology,2013-01-01,19(5)