000170860 001__ 170860
000170860 005__ 20190829172514.0
000170860 0247_ $$2doi$$a10.1016/j.orggeochem.2011.07.005
000170860 02470 $$2ISI$$a000295610800003
000170860 037__ $$aARTICLE
000170860 245__ $$aEffects of short-term ecosystem experimental warming on water-extractable organic matter in an ombrotrophic Sphagnum peatland (Le Forbonnet, France)
000170860 269__ $$a2011
000170860 260__ $$c2011
000170860 336__ $$aJournal Articles
000170860 520__ $$aIn a future warmer world, peatlands may change from a carbon sink function to a carbon source function. This study tracks changes in water-extractable organic matter (WEOM) after 1 year of in situ experimental warming using open top chambers (OTCs). WEOM was studied in the upper peat layers (0-10 cm) through analysis of water-extractable organic carbon (WEOC), stable C isotopic composition (delta C-13), specific UV absorbance at 280 nm and sugar composition of cores taken from an open bog (DRY sites) and a transitional poor fen (WET sites). At the DRY sites, the impact of OTCs was weak with respect to WEOM parameters, whereas at the WET sites, the air warming treatment led to a decrease in peat water content, suggesting that the supply of heat by OTCs was used mainly for evapotranspiration. OTCs at the WET sites also induced a relative enrichment at the surface (0-5 cm depth) of aliphatic and/or aromatic compounds with concomitant decrease in WEOC, as a result of decomposition. On the contrary, WEOC and sugar content increased in the deeper peat layer (7.5-10 cm depth) probably as a result of increased leaching of phenolic compounds by roots, which then inhibits microbial activity. The different response to experimental warming at DRY and WET sites suggests that the spatial variability of moisture is critical for understanding of the impact of global warming on the fate of OM and the carbon cycle in peatlands. (C) 2011 Elsevier Ltd. All rights reserved.
000170860 6531_ $$aWest European Mires
000170860 6531_ $$aOpen-Top Chambers
000170860 6531_ $$aChemical-Composition
000170860 6531_ $$aEcological Gradients
000170860 6531_ $$aCarbon Isotopes
000170860 6531_ $$aClimate-Change
000170860 6531_ $$aWarmer World
000170860 6531_ $$aHumic Acids
000170860 6531_ $$aSoil
000170860 6531_ $$aBog
000170860 700__ $$aDelarue, Frederic
000170860 700__ $$aLaggoun-Defarge, Fatima
000170860 700__ $$0241312$$g133834$$aButtler, Alexandre
000170860 700__ $$aGogo, Sebastien
000170860 700__ $$aJassey, Vincent E. J.
000170860 700__ $$aDisnar, Jean-Robert
000170860 773__ $$j42$$tOrganic Geochemistry$$q1016-1024
000170860 909C0 $$xU11021$$pECOS$$0252129
000170860 909CO $$qENAC$$particle$$ooai:infoscience.tind.io:170860
000170860 917Z8 $$x133834
000170860 937__ $$aEPFL-ARTICLE-170860
000170860 973__ $$rREVIEWED$$sPUBLISHED$$aEPFL
000170860 980__ $$aARTICLE