globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.12723
论文题名:
On the difference in the net ecosystem exchange of CO2 between deciduous and evergreen forests in the southeastern United States
作者: Novick K.A.; Oishi A.C.; Ward E.J.; Siqueira M.B.S.; Juang J.-Y.; Stoy P.C.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期:2
起始页码: 827
结束页码: 842
语种: 英语
英文关键词: Carbon flux ; Drought ; Eddy covariance ; Evapotranspiration ; Net ecosystem exchange ; Water use efficiency ; Wavelet spectra
Scopus关键词: carbon dioxide ; carbon flux ; carbon sink ; deciduous forest ; drought ; eddy covariance ; evapotranspiration ; evergreen forest ; net ecosystem exchange ; water use efficiency ; North Carolina ; United States ; Pinus echinata ; carbon dioxide ; biodiversity ; carbon sequestration ; climate change ; drought ; evapotranspiration ; forest ; metabolism ; physiology ; pine ; tree ; United States ; Biodiversity ; Carbon Dioxide ; Carbon Sequestration ; Climate Change ; Droughts ; Forests ; North Carolina ; Pinus ; Plant Transpiration ; Trees
英文摘要: The southeastern United States is experiencing a rapid regional increase in the ratio of pine to deciduous forest ecosystems at the same time it is experiencing changes in climate. This study is focused on exploring how these shifts will affect the carbon sink capacity of southeastern US forests, which we show here are among the strongest carbon sinks in the continental United States. Using eight-year-long eddy covariance records collected above a hardwood deciduous forest (HW) and a pine plantation (PP) co-located in North Carolina, USA, we show that the net ecosystem exchange of CO2 (NEE) was more variable in PP, contributing to variability in the difference in NEE between the two sites (ΔNEE) at a range of timescales, including the interannual timescale. Because the variability in evapotranspiration (ET) was nearly identical across the two sites over a range of timescales, the factors that determined the variability in ΔNEE were dominated by those that tend to decouple NEE from ET. One such factor was water use efficiency, which changed dramatically in response to drought and also tended to increase monotonically in nondrought years (P < 0.001 in PP). Factors that vary over seasonal timescales were strong determinants of the NEE in the HW site; however, seasonality was less important in the PP site, where significant amounts of carbon were assimilated outside of the active season, representing an important advantage of evergreen trees in warm, temperate climates. Additional variability in the fluxes at long-time scales may be attributable to slowly evolving factors, including canopy structure and increases in dormant season air temperature. Taken together, study results suggest that the carbon sink in the southeastern United States may become more variable in the future, owing to a predicted increase in drought frequency and an increase in the fractional cover of southern pines. © 2014 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/61643
Appears in Collections:影响、适应和脆弱性

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作者单位: School of Public and Environmental Affairs, Indiana University - Bloomington, 702 N. Walnut Grove Avenue, Bloomington, IN, United States; Nicholas School of the Environment, Duke University, Box 90328, Durham, NC, United States; Coweeta Hydrologic Laboratory, Southern Research Station, USDA Forest Service, 3160 Coweeta Lab Road, Otto, NC, United States; Department of Forestry and Environmental Resources, North Carolina State University, 920 Main Campus Drive Suite 300, Raleigh, NC, United States; Department of Mechanical Engineering, University of Brasilia, Brasilia, Brazil; Department of Geography, National Taiwan University, No. 1 Sec. 4 Roosevelt Road, Taipei, Taiwan; Department of Land Resources and Environmental Studies, Montana State University, 334 Leon Johnson Hall, Bozeman, MT, United States

Recommended Citation:
Novick K.A.,Oishi A.C.,Ward E.J.,et al. On the difference in the net ecosystem exchange of CO2 between deciduous and evergreen forests in the southeastern United States[J]. Global Change Biology,2015-01-01,21(2)
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