When using this data, please cite the data package:
NCEAS 10645: Zhuang: Toward an adequate quantification of CH4 emissions from land ecosystems: Integrating field and in-situ observations, satellite data, and modeling , National Center for Ecological Analysis and Synthesis , and Turetsky M. 2008. Methane fluxes from an Alaskan rich fen (APEX) nceas.921.1
Methane fluxes from an Alaskan rich fen (APEX)
Methane fluxes were collected at APEX rich fen during the summers of 2005 and 2006. APEX Fen is located in the Bonanza Creek LTER outside of Fairbanks, AK. APEX Fen uses a full-factorial water table (flooded or raised, lowered or drained, and control treatments, as well as a moisture gradient) by warming manipulation (warmed, unwarmed treatment).
water table manipulation
Data Set Creators:
NCEAS 10645: Zhuang: Toward an adequate quantification of CH4 emissions from land ecosystems: Integrating field and in-situ observations, satellite data, and modeling
National Center for Ecological Analysis and Synthesis
APEX rich fen is located in the Bonanza Creek Long-term Ecological Research site outside of Fairbanks, AK, USA
Sampling, Processing and Quality Control Methods
Step by Step Procedures
methane flux using static chamber
Methane samples were collected weekly to bi-weekly from clear static chambers (60 cm x 60 cm x 60 cm) placed on collars that are permanently embedded in the peat. Collars were sealed using foam tape. Gas samples were collected into 20 mL syringes over a period of 30 -40 minutes and analyzed for methane concentrations using a GC equipped with an FID detector. Gas fluxes not near zero that did not show a trend (9%26#37;) were discarded.
Sampling Area And Frequency:
Data were collected from 18 collars located within the water table by warming treatments at APEX Fen as described above. Moisuture gradient collars range from a black spruce site (Gradient 1), a site dominated by willow-birch shrubs (Gradient 2), a tussock site (Gradient 3, located on a tussock), and a site dominated by equisetum and carex (Gradient 4). Data coverage at all sites from 16 Jun 2005 - 22 Aug 2005, and from 19 Jun 2006 - 10 Sept 2006.
Water table treatments were randomly assigned to each plot. Permanent gas measurement collars were established within these plots and randomly assigned to a warming treatment.