World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

Drivers of Long-term Variability in Co2 Net Ecosystem Exchange in a Temperate Peatland : Volume 11, Issue 10 (22/10/2014)

By Helfter, C.

Click here to view

Book Id: WPLBN0004004737
Format Type: PDF Article :
File Size: Pages 38
Reproduction Date: 2015

Title: Drivers of Long-term Variability in Co2 Net Ecosystem Exchange in a Temperate Peatland : Volume 11, Issue 10 (22/10/2014)  
Author: Helfter, C.
Volume: Vol. 11, Issue 10
Language: English
Subject: Science, Biogeosciences, Discussions
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Dinsmore, K. J., Anderson, M., Sutton, M. A., Coyle, M., Drewer, J., Skiba, U.,...Nemitz, E. (2014). Drivers of Long-term Variability in Co2 Net Ecosystem Exchange in a Temperate Peatland : Volume 11, Issue 10 (22/10/2014). Retrieved from http://www.ebooklibrary.org/


Description
Description: Centre for Ecology and Hydrology (Edinburgh), Penicuik, Scotland, UK. Land–atmosphere exchange of carbon dioxide (CO2) in peatlands exhibits marked seasonal and inter-annual variability, which subsequently affects the carbon sink strength of catchments across multiple temporal scales. Long-term studies are needed to fully capture the natural variability and therefore identify the key hydrometeorological drivers in the net ecosystem exchange (NEE) of CO2. NEE has been measured continuously by eddy-covariance at Auchencorth Moss, a temperate lowland peatland in central Scotland, since 2002. Hence this is one of the longest peatland NEE studies to date. For 11 yr, the site was a consistent, yet variable, atmospheric CO2 sink ranging from −5.2 to −135.9 g CO2-C m<sup>−2 yr−1 (mean of −64.1 ± 33.6 g CO2-C m<sup>−2 yr−1). Inter-annual variability in NEE was positively correlated to the length of the growing season. Mean winter air temperature explained 87% of the inter-annual variability in the sink strength of the following summer, indicating a phenological memory-effect. Plant productivity exhibited a marked hysteresis with respect to photosynthetically active radiation (PAR) over the growing season, indicative of two separate growth regimes. Ecosystem respiration (Reco) and gross primary productivity (GPP) were closely correlated (ratio 0.74), suggesting that autotrophic processes were dominant. Whilst the site was wet most of the year (water table depth <5 cm) there were indications that heterotrophic respiration was enhanced by drought, which also depressed GPP. NEE was compared to 5 other peatland sites which have published long-term NEE records. The CO2 uptake rate during the growing season was comparable to 3 other European sites, however the emission rate during the dormant season was significantly higher.

Summary
Drivers of long-term variability in CO2 net ecosystem exchange in a temperate peatland

Excerpt
Aubinet, M., Grelle, A., Ibrom, A., Rannik, U., Moncrieff, J., Foken, T., Kowalski, A. S., Martin, P. H., Berbigier, P., Bernhofer, C., Clement, R., Elbers, J., Granier, A., Grunwald, T., Morgenstern, K., Pilegaard, K., Rebmann, C., Snijders, W., Valentini, R., and Vesala, T.: Estimates of the annual net carbon and water exchange of forests: the euroflux methodology, Adv. Ecol. Res., 30, 113–175, 2000.; Aurela, M., Laurila, T., and Tuovinen, J. P.: Seasonal CO2 balances of a subarctic mire, J. Geophys. Res.-Atmos., 106, 1623–1637, <a href=http://dx.doi.org/10.1029/2000jd900481>doi:10.1029/2000jd900481a>, 2001.; Aurela, M., Lohila, A., Tuovinen, J.-P., Hatakka, J., Riutta, T., and Laurila, T.: Carbon dioxide exchange on a northern boreal fen, Boreal Environ. Res., 14, 699–710, 2009.; Baldocchi, D., Falge, E., Gu, L. H., Olson, R., Hollinger, D., Running, S., Anthoni, P., Bernhofer, C., Davis, K., Evans, R., Fuentes, J., Goldstein, A., Katul, G., Law, B., Lee, X. H., Malhi, Y., Meyers, T., Munger, W., Oechel, W., Paw, K. T., Pilegaard, K., Schmid, H. P., Valentini, R., Verma, S., Vesala, T., Wilson, K., and Wofsy, S.: Fluxnet: a new tool to study the temporal and spatial variability of ecosystem-scale carbon dioxide, water vapor, and energy flux densities, B. Am. Meteorol. Soc., 82, 2415–2434, <a href=http://dx.doi.org/10.1175/1520-0477(2001)082<2415:fantts>2.3.co;2>doi:10.1175/1520-0477(2001)082<2415:fantts>2.3.co;2a>, 2001.; Bates, J. W., Thompson, K., and Grime, J. P.: Effects of simulated long-term climatic change on the bryophytes of a limestone grassland community, Glob. Change Biol., 11, 757–769, <a href=http://dx.doi.org/10.1111/j.1365-2486.2005.00953.x>doi:10.1111/j.1365-2486.2005.00953.xa>, 2005.; Billett, M. F. and Moore, T. R.: Supersaturation and evasion of CO2 and CH4 in surface waters at Mer Bleue peatland, canada, Hydrol. Process., 22, 2044–2054, <a href=http://dx.doi.org/10.1002/hyp.6805>doi:10.1002/hyp.6805a>, 2008.; Billett, M. F., Palmer, S. M., Hope, D., Deacon, C., Storeton-West, R., Hargreaves, K. J., Flechard, C., and Fowler, D.: Linking land-atmosphere-stream carbon fluxes in a lowland peatland system, Global Biogeochem. Cy., 18, GB1024, <a href=http://dx.doi.org/10.1029/2003gb002058>doi:10.1029/2003gb002058a>, 2004.; Billett, M. F., Charman, D. J., Clark, J. M., Evans, C. D., Evans, M. G., Ostle, N. J., Worrall, F., Burden, A., Dinsmore, K. J., Jones, T., McNamara, N. P., Parry, L., Rowson, J. G., and Rose, R.: Carbon balance of UK peatlands: current state of knowledge and future research challenges, Clim. Res., 45, 13–29, <a href=http://dx.doi.org/10.3354/cr00903>doi:10.3354/cr00903a>, 2010.; Bubier, J. L., Crill, P. M., Moore, T. R., Savage, K., and Varner, R. K.: Seasonal patterns and controls on net ecosystem CO2 exchange in a boreal peatland complex, Global Biogeochem. Cy., 12, 703–714, <a href=http://dx.doi.org/10.1029/98gb02426>doi:10.1029/98gb02426a>, 1998.; Christensen, T. R., Jackowicz-Korczynski, M., Aurela, M., Crill, P., Heliasz, M., Mastepanov, M., and Friborg, T.: Monitoring the multi-year carbon balance of a subarctic palsa mire with micrometeorological techniques, Ambio, 41, 207–217, <a href=http://dx.doi.org/10.1007/s13280-012-0302-5>doi:10.1007/s13280-012-0302-5a>, 2012.; Clark, J. M., Billett, M. F., Coyle, M., Croft, S., Daniels, S., Evans, C. D., Evans, M., Freeman, C., Gallego-Sala, A. V., Heinemeyer, A., House, J. I., Monteith, D. T., Nayak, D., Orr, H. G., Prentice, I. C., Rose, R., Rowson, J., Smith, J. U., Smith, P., Tun, Y. M., Vanguelova, E., Wetterhall, F., and Worrall, F.: Model inter-comparison between statistical and dynamic model assessments of the long-term stability of blanket peat in great britain (1940–2099), Clim. Res., 45, 227–281, <a href=http://d


 

Click To View

Additional Books


  • Detection of Low Bottom Water Oxygen Con... (by )
  • Effects of Ocean Acidification on the La... (by )
  • Impacts of Increasing Water and Nitrogen... (by )
  • Short Term Changes in Methanol Emission ... (by )
  • An Experimental Study on the Effects of ... (by )
  • Short Scale (6 H) Temporal Variation of ... (by )
  • Physical and Biogeochemical Controls on ... (by )
  • Remotely Sensed Land-surface Energy Flux... (by )
  • Ocean Biogeochemistry Exhibits Contrasti... (by )
  • A Transfer Function for the Prediction o... (by )
  • Small-scale Spatial Structure in Plankto... (by )
  • Monte Carlo Based Calibration and Uncert... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.