000224691 001__ 224691
000224691 005__ 20181203024524.0
000224691 0247_ $$2doi$$a10.1111/gcb.13319
000224691 022__ $$a1354-1013
000224691 02470 $$2ISI$$a000387813300023
000224691 037__ $$aARTICLE
000224691 245__ $$aPersistent high temperature and low precipitation reduce peat carbon accumulation
000224691 260__ $$bWiley-Blackwell$$c2016$$aHoboken
000224691 269__ $$a2016
000224691 300__ $$a10
000224691 336__ $$aJournal Articles
000224691 520__ $$aExtreme climate events are predicted to become more frequent and intense. Their ecological impacts, particularly on carbon cycling, can differ in relation to ecosystem sensitivity. Peatlands, being characterized by peat accumulation under waterlogged conditions, can be particularly sensitive to climate extremes if the climate event increases soil oxygenation. However, a mechanistic understanding of peatland responses to persistent climate extremes is still lacking, particularly in terms of aboveground-belowground feedback. Here, we present the results of a transplantation experiment of peat mesocosms from high to low altitude in order to simulate, during 3years, a mean annual temperature c. 5 degrees C higher and a mean annual precipitation c. 60% lower. Specifically, we aim at understanding the intensity of changes for a set of biogeochemical processes and their feedback on carbon accumulation. In the transplanted mesocosms, plant productivity showed a species-specific response depending on plant growth forms, with a significant decrease (c. 60%) in peat moss productivity. Soil respiration almost doubled and Q(10) halved in the transplanted mesocosms in combination with an increase in activity of soil enzymes. Spectroscopic characterization of peat chemistry in the transplanted mesocosms confirmed the deepening of soil oxygenation which, in turn, stimulated microbial decomposition. After 3years, soil carbon stock increased only in the control mesocosms whereas a reduction in mean annual carbon accumulation of c. 30% was observed in the transplanted mesocosms. Based on the above information, a structural equationmodel was built to provide a mechanistic understanding of the causal connections between peat moisture, vegetation response, soil respiration and carbon accumulation. This study identifies, in the feedback between plant and microbial responses, the primary pathways explaining the reduction in carbon accumulation in response to recurring climate extremes in peat soils.
000224691 6531_ $$acarbon accumulation
000224691 6531_ $$aclimate extreme
000224691 6531_ $$adrought
000224691 6531_ $$aorganic matter chemistry
000224691 6531_ $$aplant productivity
000224691 6531_ $$aQ
000224691 6531_ $$a(10)
000224691 6531_ $$asoil enzymes
000224691 6531_ $$asoil respiration
000224691 700__ $$0243968$$g184644$$aBragazza, Luca
000224691 700__ $$0241312$$g133834$$aButtler, Alexandre
000224691 700__ $$0247004$$g229386$$aRobroek, Bjorn J. M.
000224691 700__ $$0248123$$g246844$$aAlbrecht, Remy
000224691 700__ $$aZaccone, Claudio
000224691 700__ $$aJassey, Vincent E. J.
000224691 700__ $$aSignarbieux, Constant$$g223839$$0246140
000224691 773__ $$j22$$tGLOBAL CHANGE BIOLOGY$$k12$$q4114-4123
000224691 909C0 $$xU11021$$0252129$$pECOS
000224691 909CO $$particle$$pENAC$$ooai:infoscience.tind.io:224691
000224691 917Z8 $$x184644
000224691 937__ $$aEPFL-ARTICLE-224691
000224691 973__ $$rREVIEWED$$sPUBLISHED$$aEPFL
000224691 980__ $$aARTICLE