globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.12564
论文题名:
Elevated carbon dioxide and ozone alter productivity and ecosystem carbon content in northern temperate forests
作者: Talhelm A.F.; Pregitzer K.S.; Kubiske M.E.; Zak D.R.; Campany C.E.; Burton A.J.; Dickson R.E.; Hendrey G.R.; Isebrands J.G.; Lewin K.F.; Nagy J.; Karnosky D.F.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2014
卷: 20, 期:8
起始页码: 2492
结束页码: 2504
语种: 英语
英文关键词: Air pollution ; Carbon sequestration ; Carbon storage ; Net primary productivity (NPP) ; Nitrogen ; Soil carbon
Scopus关键词: biomass ; canopy architecture ; carbon dioxide ; carbon sequestration ; community response ; ozone ; primary production ; temperate forest ; troposphere ; United States ; air pollutant ; carbon ; carbon dioxide ; ozone ; soil ; Acer ; air pollutant ; biomass ; birch ; chemistry ; drug effects ; ecosystem ; forest ; growth, development and aging ; pharmacology ; soil ; theoretical model ; tree ; United States ; Acer ; Air Pollutants ; Betula ; Biomass ; Carbon ; Carbon Dioxide ; Ecosystem ; Forests ; Models, Theoretical ; Ozone ; Soil ; Trees ; United States
英文摘要: Three young northern temperate forest communities in the north-central United States were exposed to factorial combinations of elevated carbon dioxide (CO2) and tropospheric ozone (O3) for 11 years. Here, we report results from an extensive sampling of plant biomass and soil conducted at the conclusion of the experiment that enabled us to estimate ecosystem carbon (C) content and cumulative net primary productivity (NPP). Elevated CO2 enhanced ecosystem C content by 11%, whereas elevated O3 decreased ecosystem C content by 9%. There was little variation in treatment effects on C content across communities and no meaningful interactions between CO2 and O3. Treatment effects on ecosystem C content resulted primarily from changes in the near-surface mineral soil and tree C, particularly differences in woody tissues. Excluding the mineral soil, cumulative NPP was a strong predictor of ecosystem C content (r2 = 0.96). Elevated CO2 enhanced cumulative NPP by 39%, a consequence of a 28% increase in canopy nitrogen (N) content (g N m-2) and a 28% increase in N productivity (NPP/canopy N). In contrast, elevated O3 lowered NPP by 10% because of a 21% decrease in canopy N, but did not impact N productivity. Consequently, as the marginal impact of canopy N on NPP ({increment}NPP/{increment}N) decreased through time with further canopy development, the O3 effect on NPP dissipated. Within the mineral soil, there was less C in the top 0.1 m of soil under elevated O3 and less soil C from 0.1 to 0.2 m in depth under elevated CO2. Overall, these results suggest that elevated CO2 may create a sustained increase in NPP, whereas the long-term effect of elevated O3 on NPP will be smaller than expected. However, changes in soil C are not well-understood and limit our ability to predict changes in ecosystem C content. © 2014 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/62170
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Forest, Rangeland, and Fire Sciences, College of Natural Resources, University of Idaho, Moscow, ID, 83844, United States; Northern Research Station, USDA Forest Service, Rhinelander, WI, 54501, United States; School of Natural Resources and Environment, Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI, 48109, United States; Hawkesbury Institute for the Environment, University of Western Sydney, Locked Bag 1797, Penrith, NSW, 2751, Australia; Ecosystem Science Center and School of Forest Resources and Environmental Science, Michigan Technological University, Houghton, MI, 49931, United States; School of Earth and Environmental Science, Queens College, City University of New York, New York, NY, 11367, United States; Environmental Forestry Consultants, LLC, E7323 State Road 54, New London, WI, 54961, United States; Environmental Sciences Department, Brookhaven National Laboratory, Upton, NY, 11973, United States

Recommended Citation:
Talhelm A.F.,Pregitzer K.S.,Kubiske M.E.,et al. Elevated carbon dioxide and ozone alter productivity and ecosystem carbon content in northern temperate forests[J]. Global Change Biology,2014-01-01,20(8)
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