DOI: 10.1111/gcb.12177
论文题名: No cumulative effect of 10 years of elevated [CO2] on perennial plant biomass components in the Mojave Desert
作者: Newingham B.A. ; Vanier C.H. ; Charlet T.N. ; Ogle K. ; Smith S.D. ; Nowak R.S.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 7 起始页码: 2168
结束页码: 2181
语种: 英语
英文关键词: Carbon
; Deciduous
; Evergreen
; FACE
; Functional group
; Isotopes
; Nitrogen
; Standing crop
Scopus关键词: carbon dioxide
; snow
; aboveground biomass
; belowground biomass
; carbon dioxide
; deciduous tree
; evergreen tree
; nitrogen
; perennial plant
; photosynthesis
; primary production
; terrestrial ecosystem
; water availability
; article
; biomass
; China
; cold
; desert climate
; growth, development and aging
; plant leaf
; season
; theoretical model
; time
; Biomass
; Carbon Dioxide
; China
; Cold Temperature
; Desert Climate
; Models, Theoretical
; Plant Leaves
; Seasons
; Snow
; Time Factors
; Mojave Desert
; United States
英文摘要: Elevated atmospheric CO2 concentrations ([CO2]) generally increase primary production of terrestrial ecosystems. Production responses to elevated [CO2] may be particularly large in deserts, but information on their long-term response is unknown. We evaluated the cumulative effects of elevated [CO2] on primary production at the Nevada Desert FACE (free-air carbon dioxide enrichment) Facility. Aboveground and belowground perennial plant biomass was harvested in an intact Mojave Desert ecosystem at the end of a 10-year elevated [CO2] experiment. We measured community standing biomass, biomass allocation, canopy cover, leaf area index (LAI), carbon and nitrogen content, and isotopic composition of plant tissues for five to eight dominant species. We provide the first long-term results of elevated [CO2] on biomass components of a desert ecosystem and offer information on understudied Mojave Desert species. In contrast to initial expectations, 10 years of elevated [CO2] had no significant effect on standing biomass, biomass allocation, canopy cover, and C : N ratios of above- and belowground components. However, elevated [CO2] increased short-term responses, including leaf water-use efficiency (WUE) as measured by carbon isotope discrimination and increased plot-level LAI. Standing biomass, biomass allocation, canopy cover, and C : N ratios of above- and belowground pools significantly differed among dominant species, but responses to elevated [CO2] did not vary among species, photosynthetic pathway (C3 vs. C4), or growth form (drought-deciduous shrub vs. evergreen shrub vs. grass). Thus, even though previous and current results occasionally show increased leaf-level photosynthetic rates, WUE, LAI, and plant growth under elevated [CO2] during the 10-year experiment, most responses were in wet years and did not lead to sustained increases in community biomass. We presume that the lack of sustained biomass responses to elevated [CO2] is explained by inter-annual differences in water availability. Therefore, the high frequency of low precipitation years may constrain cumulative biomass responses to elevated [CO2] in desert environments. © 2013 Blackwell Publishing Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62393
Appears in Collections: 影响、适应和脆弱性
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作者单位: College of Natural Resources, University of Idaho, PO Box 441133, Moscow, ID, 83844-1133, United States; School of Life Sciences, University of Nevada, Las Vegas, 4505 S. Maryland Parkway, Las Vegas, NV, 89154-4004, United States; Public Lands Institute, University of Nevada, Las Vegas, 4505 S. Maryland Parkway, Las Vegas, NV, 89154-4004, United States; School of Life Sciences, Arizona State University, Tempe, AZ, 85287-4501, United States; Department of Natural Resources and Environmental Science/MS 186, University of Nevada, Reno, 1664 North Virginia, Reno, NV, 89557, United States
Recommended Citation:
Newingham B.A.,Vanier C.H.,Charlet T.N.,et al. No cumulative effect of 10 years of elevated [CO2] on perennial plant biomass components in the Mojave Desert[J]. Global Change Biology,2013-01-01,19(7)