(Supplemental Table 2) Plant characteristics, GHG fluxes, and soil chemical and microbial properties in experimental treatments in Alexandra Fiord

DOI

We evaluated above- and belowground ecosystem changes in a 16 year, combined fertilization and warming experiment in a High Arctic tundra deciduous shrub heath (Alexandra Fiord, Ellesmere Island, NU, Canada). Soil emissions of the three key greenhouse gases (GHGs) (carbon dioxide, methane, and nitrous oxide) were measured in mid-July 2009 using soil respiration chambers attached to a FTIR system. Soil chemical and biochemical properties including Q10 values for CO2, CH4, and N2O, Bacteria and Archaea assemblage composition, and the diversity and prevalence of key nitrogen cycling genes including bacterial amoA, crenarchaeal amoA, and nosZ were measured. Warming and fertilization caused strong increases in plant community cover and height but had limited effects on GHG fluxes and no substantial effect on soil chemistry or biochemistry. Similarly, there was a surprising lack of directional shifts in the soil microbial community as a whole or any change at all in microbial functional groups associated with CH4 consumption or N2O cycling in any treatment. Thus, it appears that while warming and increased nutrient availability have strongly affected the plant community over the last 16 years, the belowground ecosystem has not yet responded. This resistance of the soil ecosystem has resulted in limited changes in GHG fluxes in response to the experimental treatments.

n=5 for all values except the Control treatment for CO2, CH4, and N2O where n=45. Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150

Supplement to: Lamb, Eric G; Han, Sukkyun; Lanoil, Brian D; Henry, Gregory HR; Brummell, Martin E; Banerjee, Samiran; Siciliano, Steven D (2011): A High Arctic soil ecosystem resists long-term environmental manipulations. Global Change Biology, 17(10), 3187-3194

Identifier
DOI https://doi.org/10.1594/PANGAEA.815197
Related Identifier https://doi.org/10.1111/j.1365-2486.2011.02431.x
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.815197
Provenance
Creator Lamb, Eric G ORCID logo; Han, Sukkyun; Lanoil, Brian D ORCID logo; Henry, Gregory HR; Brummell, Martin E ORCID logo; Banerjee, Samiran; Siciliano, Steven D ORCID logo
Publisher PANGAEA
Publication Year 2011
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 264 data points
Discipline Earth System Research
Spatial Coverage (-75.917 LON, 78.883 LAT); Ellesmere Island, Canadian Arctic Archipelago