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Title

Above- and belowground linkages in Sphagnum peatland: climate warming affects plant-microbial interactions

Publication Year

2013

Author(s)
  • Jassey, Vincent E. J.
  • Chiapusio, Genevieve
  • Binet, Philippe
  • Buttler, Alexandre
  • Laggoun-Defarge, Fatima
  • Delarue, Frederic
  • Bernard, Nadine
  • Mitchell, Edward A. D.
  • Toussaint, Marie-Laure
  • Francez, Andre-Jean
  • Gilbert, Daniel
Source
GLOBAL CHANGE BIOLOGY Volume: 19 Issue: 3 Pages: 811-823 Published: 2013
ISSN
1354-1013
Abstract

Peatlands contain approximately one third of all soil organic carbon (SOC). Warming can alter above- and belowground linkages that regulate soil organic carbon dynamics and C-balance in peatlands. Here we examine the multiyear impact of in situ experimental warming on the microbial food web, vegetation, and their feedbacks with soil chemistry. We provide evidence of both positive and negative impacts of warming on specific microbial functional groups, leading to destabilization of the microbial food web. We observed a strong reduction (70%) in the biomass of top-predators (testate amoebae) in warmed plots. Such a loss caused a shortening of microbial food chains, which in turn stimulated microbial activity, leading to slight increases in levels of nutrients and labile C in water. We further show that warming altered the regulatory role of Sphagnum-polyphenols on microbial community structure with a potential inhibition of top predators. In addition, warming caused a decrease in Sphagnum cover and an increase in vascular plant cover. Using structural equation modelling, we show that changes in the microbial food web affected the relationships between plants, soil water chemistry, and microbial communities. These results suggest that warming will destabilize C and nutrient recycling of peatlands via changes in above- and belowground linkages, and therefore, the microbial food web associated with mosses will feedback positively to global warming by destabilizing the carbon cycle. This study confirms that microbial food webs thus constitute a key element in the functioning of peatland ecosystems. Their study can help understand how mosses, as ecosystem engineers, tightly regulate biogeochemical cycling and climate feedback in peatlands

Author Keyword(s)
  • food chains
  • microbial food web
  • plant and microbial communities
  • polyphenols
  • testate amoebae
  • water chemistry
KeyWord(s) Plus
  • TESTATE AMEBAS PROTOZOA
  • CARBON SEQUESTRATION
  • DOMINATED PEATLANDS
  • SOIL BIODIVERSITY
  • WATER CHEMISTRY
  • LITTER QUALITY
  • SIZE STRUCTURE
  • NEBELA-TINCTA
  • GLOBAL CHANGE
  • ELEVATED CO2
ESI Discipline(s)
  • Environment/Ecology
Web of Science Category(ies)
  • Biodiversity Conservation
  • Ecology
  • Environmental Sciences
Adress(es)

[Jassey, Vincent E. J.; Chiapusio, Genevieve; Binet, Philippe; Buttler, Alexandre; Bernard, Nadine; Toussaint, Marie-Laure; Gilbert, Daniel] Univ Franche Comte, UMR CNRS UFC 6249, Lab Chronoenvironm, F-25211 Montbeliard, France; [Jassey, Vincent E. J.; Buttler, Alexandre] Ecole Polytech Fed Lausanne, Sch Architecture, Stn 2, Ecol Syst Lab ECOS,Civil & Environm Engn ENAC, CH-1015 Lausanne, Switzerland; [Jassey, Vincent E. J.; Buttler, Alexandre] Swiss Fed Inst Forest, Snow & Landscape Res WSL, Stn 2, CH-1015 Lausanne, Switzerland; [Laggoun-Defarge, Fatima; Delarue, Frederic] Univ Orleans, UMR 7327, ISTO, F-45071 Orleans, France; [Laggoun-Defarge, Fatima; Delarue, Frederic] CNRS, UMR 7327, ISTO, INSU, F-45071 Orleans, France; [Laggoun-Defarge, Fatima; Delarue, Frederic] Bur Rech Geol & Minieres, UMR 7327, ISTO, F-45060 Orleans, France; [Mitchell, Edward A. D.] Univ Neuchatel, Lab Soil Biol, CH-2000 Neuchatel, Switzerland; [Francez, Andre-Jean] Univ Rennes 1, CNRS, UMR ECOBIO Ecosyst Biodiversite Evolut 6553, F-35042 Rennes, France; [Francez, Andre-Jean] Univ Rennes 1, FR CAREN 90, F-35042 Rennes, France

Reprint Adress

Jassey, VEJ (reprint author), Univ Franche Comte, UMR CNRS UFC 6249, Lab Chronoenvironm, F-25211 Montbeliard, France.

Country(ies)
  • France
  • Switzerland
CNRS - Adress(es)
  • Chrono-environnement, UMR6249
  • Ecosystèmes, biodiversité, évolution (ECOBIO), UMR6553
  • Institut des Sciences de la Terre d'Orléans (ISTO), UMR7327
Accession Number
WOS:000314219700013
uid:/4BGJGL45
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