DOI: 10.1111/gcb.13010
论文题名: Photosynthesis and isoprene emission from trees along an urban-rural gradient in Texas
作者: Lahr E.C. ; Schade G.W. ; Crossett C.C. ; Watson M.R.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 11 起始页码: 4221
结束页码: 4236
语种: 英语
英文关键词: Biosphere-atmosphere interactions
; Carbon dioxide
; Liquidambar styraciflua
; Post oak
; Quercus stellata
; Sweet gum
; Temperature
; VOC
; Volatile organic compound
Scopus关键词: atmosphere-biosphere interaction
; carbon dioxide
; climate change
; climate effect
; emission inventory
; future prospect
; isoprene
; photosynthesis
; physiological response
; temperature effect
; temperature tolerance
; tree
; Texas
; United States
; Liquidambar styraciflua
; Quercus stellata
; 1,3 butadiene derivative
; hemiterpene
; isoprene
; pentane
; agriculture
; city
; climate change
; environment
; heat
; Liquidambar
; metabolism
; oak
; photosynthesis
; plant leaf
; Texas
; tree
; Agriculture
; Butadienes
; Cities
; Climate Change
; Environment
; Hemiterpenes
; Hot Temperature
; Liquidambar
; Pentanes
; Photosynthesis
; Plant Leaves
; Quercus
; Texas
; Trees
英文摘要: Isoprene emission is an important mechanism for improving the thermotolerance of plant photosystems as temperatures increase. In this study, we measured photosynthesis and isoprene emission in trees along an urban-rural gradient that serves as a proxy for climate change, to understand daily and seasonal responses to changes in temperature and other environmental variables. Leaf-level gas exchange and basal isoprene emission of post oak (Quercus stellata) and sweet gum (Liquidambar styraciflua) were recorded at regular intervals over an entire growing season at urban, suburban, and rural sites in eastern Texas. In addition, the temperature and atmospheric carbon dioxide concentration experienced by leaves were experimentally manipulated in spring, early summer, and late summer. We found that trees experienced lower stomatal conductance and photosynthesis and higher isoprene emission, at the urban and suburban sites compared to the rural site. Path analysis indicated a daily positive effect of isoprene emission on photosynthesis, but unexpectedly, higher isoprene emission from urban trees was not associated with improved photosynthesis as temperatures increased during the growing season. Furthermore, urban trees experienced relatively higher isoprene emission at high CO2 concentrations, while isoprene emission was suppressed at the other sites. These results suggest that isoprene emission may be less beneficial in urban, and potentially future, environmental conditions, particularly if higher temperatures override the suppressive effects of high CO2 on isoprene emission. These are important considerations for modeling future biosphere-atmosphere interactions and for understanding tree physiological responses to climate change. © 2015 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61837
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Atmospheric Sciences, Texas A and M University, College Station, TX, United States; Department of Geoscience, Hobart and William Smith Colleges, Geneva, NY, United States
Recommended Citation:
Lahr E.C.,Schade G.W.,Crossett C.C.,et al. Photosynthesis and isoprene emission from trees along an urban-rural gradient in Texas[J]. Global Change Biology,2015-01-01,21(11)