, Volume 41, Issue 3, pp 215-235  Response of tundra CH4 and CO2
flux tomanipulation of temperature and vegetation  Rent the
article at a discount  Rent now  * Final gross prices may vary
according to local VAT.  Get Access   We conducted plant species
removals, air temperaturemanipulations, and vegetation and soil
transplants inAlaskan wet-meadow and tussock tundra communities
todetermine the relative importance of vegetation typeand
environmental variables in controlling ecosystemmethane (CH4)
and carbon dioxide (CO2) flux. Plastic greenhouses placed over
wet-meadow tundraincreased air temperature, soil temperature,
and soilmoisture, but did not affect CH4 or CO2 flux(measured in
the dark). By contrast, removal ofsedges in the wet meadow
significantly decreased fluxof CH4, while moss removal tended to
increaseCH4 emissions. At 15 cm depth, pore-waterCH4
concentrations were higher in sedge-removalthan in control
plots, suggesting that sedgescontribute to CH4 emissions by
transportingCH4 from anaerobic soil t