DOI: 10.1111/gcb.12214
论文题名: Lower responsiveness of canopy evapotranspiration rate than of leaf stomatal conductance to open-air CO2 elevation in rice
作者: Shimono H. ; Nakamura H. ; Hasegawa T. ; Okada M.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 8 起始页码: 2444
结束页码: 2453
语种: 英语
英文关键词: Atmospheric carbon dioxide concentration
; Canopy evapotranspiration rate
; Crop coefficient
; Free-air CO2 enrichment
; Rice
; Simulation model
; Stomatal conductance
Scopus关键词: carbon dioxide
; water
; canopy
; carbon dioxide
; concentration (composition)
; evapotranspiration
; experimental study
; growing season
; leaf area index
; modeling
; rice
; stomatal conductance
; article
; atmospheric carbon dioxide concentration
; canopy evapotranspiration rate
; climate change
; crop coefficient
; evapotranspiration
; free-air CO2 enrichment
; metabolism
; physiology
; plant leaf
; plant stoma
; rice
; simulation
; stomatal conductance
; temperature
; atmospheric carbon dioxide concentration
; canopy evapotranspiration rate
; crop coefficient
; free-air CO2 enrichment
; rice
; simulation model
; stomatal conductance
; Carbon Dioxide
; Climate Change
; Oryza sativa
; Plant Leaves
; Plant Stomata
; Plant Transpiration
; Temperature
; Water
; Oryza sativa
英文摘要: An elevated atmospheric CO2 concentration ([CO2]) can reduce stomatal conductance of leaves for most plant species, including rice (Oryza sativa L.). However, few studies have quantified seasonal changes in the effects of elevated [CO2] on canopy evapotranspiration, which integrates the response of stomatal conductance of individual leaves with other responses, such as leaf area expansion, changes in leaf surface temperature, and changes in developmental stages, in field conditions. We conducted a field experiment to measure seasonal changes in stomatal conductance of the uppermost leaves and in the evapotranspiration, transpiration, and evaporation rates using a lysimeter method. The study was conducted for flooded rice under open-air CO2 elevation. Stomatal conductance decreased by 27% under elevated [CO2], averaged throughout the growing season, and evapotranspiration decreased by an average of 5% during the same period. The decrease in daily evapotranspiration caused by elevated [CO2] was more significantly correlated with air temperature and leaf area index (LAI) rather than with other parameters of solar radiation, days after transplanting, vapor-pressure deficit and FAO reference evapotranspiration. This indicates that higher air temperatures, within the range from 16 to 27 °C, and a larger LAI, within the range from 0 to 4 m2 m-2, can increase the magnitude of the decrease in evapotranspiration rate caused by elevated [CO2]. The crop coefficient (i.e. the evapotranspiration rate divided by the FAO reference evapotranspiration rate) was 1.24 at ambient [CO2] and 1.17 at elevated [CO2]. This study provides the first direct measurement of the effects of elevated [CO2] on rice canopy evapotranspiration under open-air conditions using the lysimeter method, and the results will improve future predictions of water use in rice fields. © 2013 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62387
Appears in Collections: 影响、适应和脆弱性
There are no files associated with this item.
作者单位: Climate Change Research Team, National Agricultural Research Center for Tohoku Region, Iwate University, Shimokuriyagawa, Iwate 020-0198, Japan; Agro-Meteorology Division, National Institute for Agro-Environmental Sciences, 3-1-3 Kannondai, Tsukuba, Ibaraki 305-8604, Japan
Recommended Citation:
Shimono H.,Nakamura H.,Hasegawa T.,et al. Lower responsiveness of canopy evapotranspiration rate than of leaf stomatal conductance to open-air CO2 elevation in rice[J]. Global Change Biology,2013-01-01,19(8)