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Interannual variability of net ecosystem productivity in forests is explained by carbon flux phenology in autumn

Global ecology and biogeography, 2013-08, Vol.22 (8), p.994-1006 [Peer Reviewed Journal]

Copyright © 2013 John Wiley & Sons Ltd. ;2013 John Wiley & Sons Ltd ;2014 INIST-CNRS ;ISSN: 1466-822X ;EISSN: 1466-8238 ;DOI: 10.1111/geb.12044 ;CODEN: GEBIFS

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Title:
Interannual variability of net ecosystem productivity in forests is explained by carbon flux phenology in autumn
Author: Wu, Chaoyang ; Chen, Jing M. ; Black, T. Andrew ; Price, David T. ; Kurz, Werner A. ; Desai, Ankur R. ; Gonsamo, Alemu ; Jassal, Rachhpal S. ; Gough, Christopher M. ; Bohrer, Gil ; Dragoni, Danilo ; Herbst, Mathias ; Gielen, Bert ; Berninger, Frank ; Vesala, Timo ; Mammarella, Ivan ; Pilegaard, Kim ; Blanken, Peter D.
Subjects: Animal and plant ecology ; Animal, plant and microbial ecology ; Autumn ; Biological and medical sciences ; Boreal forests ; Broadleaved evergreen forests ; Carbon ; Carbon cycle ; Deciduous forests ; ecosystem respiration ; Ecosystems ; forest ; Forest ecology ; Forest ecosystems ; Forestry ; Fundamental and applied biological sciences. Psychology ; General aspects ; General forest ecology ; Generalities. Production, biomass. Quality of wood and forest products. General forest ecology ; gross primary productivity ; Growing seasons ; net carbon exchange ; Phenology ; Productivity ; Spring ; Synecology
Is Part Of: Global ecology and biogeography, 2013-08, Vol.22 (8), p.994-1006
Description: Aim: To investigate the importance of autumn phenology in controlling interannual variability of forest net ecosystem productivity (NEP) and to derive new phenological metrics to explain the interannual variability of NEP. Location: North America and Europe. Method: Flux data from nine deciduous broadleaf forests (DBF) and 13 evergreen needleleaf forests (ENF) across North America and Europe (212 site-years) were used to explore the relationships between the yearly anomalies of annual NEP and several carbon flux based phenological indicators, including the onset/end of the growing season, onset/end of the carbon uptake period, the spring lag (time interval between the onset of growing season and carbon uptake period) and the autumn lag (time interval between the end of the carbon uptake period and the growing season). Meteorological variables, including global shortwave radiation, air temperature, soil temperature, soil water content and precipitation, were also used to explain the phenological variations. Results: We found that interannual variability of NEP can be largely explained by autumn phenology, i.e. the autumn lag. While variation in neither annual gross primary productivity (GPP) nor in annual ecosystem respiration (R e ) alone could explain this variability, the negative relationship between annual NEP and autumn lag was due to a larger R e /GPP ratio in years with a prolonged autumn lag. For DBF sites, a longer autumn lag coincided with a significant decrease in annual GPP but showed no correlation with annual R e . However, annual GPP was insensitive to a longer autumn lag in ENF sites but annual R e increased significantly. Main conclusions: These results demonstrate that autumn phenology plays a more direct role than spring phenology in regulating interannual variability of annual NEP. In particular, the importance of respiration may be potentially underestimated in deriving phenological indicators.
Publisher: Oxford: Blackwell Publishing Ltd
Language: English
Identifier: ISSN: 1466-822X
EISSN: 1466-8238
DOI: 10.1111/geb.12044
CODEN: GEBIFS
Source: Alma/SFX Local Collection

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Interannual variability of net ecosystem productivity in forests is explained by carbon flux phenology in autumn

Copyright © 2013 John Wiley & Sons Ltd. ;2013 John Wiley & Sons Ltd ;2014 INIST-CNRS ;ISSN: 1466-822X ;EISSN: 1466-8238 ;DOI: 10.1111/geb.12044 ;CODEN: GEBIFS

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