title: Soil warming and carbon-cycle feedbacks to the climate system.
abstract: In a decade-long soil warming experiment in a mid-latitude hardwood forest, we documented changes in soil carbon and nitrogen cycling in order to investigate the consequences of these changes for the climate system. Here we show that whereas soil warming accelerates soil organic matter decay and carbon dioxide fluxes to the atmosphere, this response is small and short-lived for a mid-latitude forest, because of the limited size of the labile soil carbon pool. We also show that warming increases the availability of mineral nitrogen to plants. Because plant growth in many mid-latitude forests is nitrogen-limited, warming has the potential to indirectly stimulate enough carbon storage in plants to at least compensate for the carbon losses from soils. Our results challenge assumptions made in some climate models that lead to projections of large long-term releases of soil carbon in response to warming of forest ecosystems.
authors.affiliation: The Ecosystems Center, Marine Biological Laboratory, Woods Hole, MA 02543, USA. jmelillo@mbl.edu
authors.forename: J M
authors.initials: JM
authors.lastname: Melillo
authors.forename: P A
authors.initials: PA
authors.lastname: Steudler
authors.forename: J D
authors.initials: JD
authors.lastname: Aber
authors.forename: K
authors.initials: K
authors.lastname: Newkirk
authors.forename: H
authors.initials: H
authors.lastname: Lux
authors.forename: F P
authors.initials: FP
authors.lastname: Bowles
authors.forename: C
authors.initials: C
authors.lastname: Catricala
authors.forename: A
authors.initials: A
authors.lastname: Magill
authors.forename: T
authors.initials: T
authors.lastname: Ahrens
authors.forename: S
authors.initials: S
authors.lastname: Morrisseau
mesh_terms: D001673:Biodegradation, Environmental; D002244:Carbon / Q000378:metabolism*; D002245:Carbon Dioxide / Q000378:metabolism; D002980:Climate; D017753:Ecosystem; D005308:Fertilizers; D008404:Massachusetts; D009584:Nitrogen / Q000378:metabolism; D010944:Plants / Q000378:metabolism*; D012987:Soil; D013696:Temperature; D014197:Trees / Q000378:metabolism
chemical_list: D005308:Fertilizers; D012987:Soil; D002245:Carbon Dioxide; D002244:Carbon; D009584:Nitrogen