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Temporal variation of rhizodeposit-C assimilating microbial communities in a natural wetland

(2013) BIOLOGY AND FERTILITY OF SOILS. 49(3). p.333-341
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Abstract
The objective of this study was to apply phospholipid fatty acid (PLFA)-based stable isotope probing to assess the temporal variation of active microorganisms associated with rhizosphere-C flow in a natural wetland. We applied (CO2)-C-13 pulse labeling at three different times throughout the vegetation period: spring (April), early summer (June), and early autumn (October). Soil redox potentials (Eh) at 10 cm depth ranged from moderately reduced (October) to oxidized conditions (June). Based on combined PLFA relative abundance and C-13 enrichment results, we suggest that gram-negative bacteria play a main role in rhizodeposit-C uptake in these wetland ecosystems, especially when reduced soil conditions prevail in October. Arbuscular and saprotrophic fungi also take up a significant proportion of the belowground allocated C, though mostly in the summer period. Gram-positive bacteria showed only a minor reliance on rhizodeposit-C throughout the year. It is concluded that rhizodeposit-C-assimilating microbial communities are heterogeneous and temporal variable entities with groups that are capable of adapting differently to seasonally varying environmental conditions.
Keywords
Phospholipid fatty acid analysis, Natural wetland, Stable isotope probing, (CO2)-C-13 pulse labeling, Rhizodeposit-C assimilation, Temperate climate, SULFATE-REDUCING BACTERIA, ARBUSCULAR MYCORRHIZAL FUNGI, ELEVATED ATMOSPHERIC CO2, PHOSPHOLIPID FATTY-ACIDS, IN-SITU, CYANOBACTERIAL MATS, ORGANIC-MATTER, CARBON FLOW, SALT-MARSH, SOIL

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Chicago
Balasooriya Lekamalage, Wajira Kumuduni, Dries Huygens, Karolien Denef, Dries Roobroeck, Niko Verhoest, and Pascal Boeckx. 2013. “Temporal Variation of rhizodeposit-C Assimilating Microbial Communities in a Natural Wetland.” Biology and Fertility of Soils 49 (3): 333–341.
APA
Balasooriya Lekamalage, W. K., Huygens, D., Denef, K., Roobroeck, D., Verhoest, N., & Boeckx, P. (2013). Temporal variation of rhizodeposit-C assimilating microbial communities in a natural wetland. BIOLOGY AND FERTILITY OF SOILS, 49(3), 333–341.
Vancouver
1.
Balasooriya Lekamalage WK, Huygens D, Denef K, Roobroeck D, Verhoest N, Boeckx P. Temporal variation of rhizodeposit-C assimilating microbial communities in a natural wetland. BIOLOGY AND FERTILITY OF SOILS. 2013;49(3):333–41.
MLA
Balasooriya Lekamalage, Wajira Kumuduni, Dries Huygens, Karolien Denef, et al. “Temporal Variation of rhizodeposit-C Assimilating Microbial Communities in a Natural Wetland.” BIOLOGY AND FERTILITY OF SOILS 49.3 (2013): 333–341. Print.
@article{3192944,
  abstract     = {The objective of this study was to apply phospholipid fatty acid (PLFA)-based stable isotope probing to assess the temporal variation of active microorganisms associated with rhizosphere-C flow in a natural wetland. We applied (CO2)-C-13 pulse labeling at three different times throughout the vegetation period: spring (April), early summer (June), and early autumn (October). Soil redox potentials (Eh) at 10 cm depth ranged from moderately reduced (October) to oxidized conditions (June). Based on combined PLFA relative abundance and C-13 enrichment results, we suggest that gram-negative bacteria play a main role in rhizodeposit-C uptake in these wetland ecosystems, especially when reduced soil conditions prevail in October. Arbuscular and saprotrophic fungi also take up a significant proportion of the belowground allocated C, though mostly in the summer period. Gram-positive bacteria showed only a minor reliance on rhizodeposit-C throughout the year. It is concluded that rhizodeposit-C-assimilating microbial communities are heterogeneous and temporal variable entities with groups that are capable of adapting differently to seasonally varying environmental conditions.},
  author       = {Balasooriya Lekamalage, Wajira Kumuduni and Huygens, Dries and Denef, Karolien and Roobroeck, Dries and Verhoest, Niko and Boeckx, Pascal},
  issn         = {0178-2762},
  journal      = {BIOLOGY AND FERTILITY OF SOILS},
  keyword      = {Phospholipid fatty acid analysis,Natural wetland,Stable isotope probing,(CO2)-C-13 pulse labeling,Rhizodeposit-C assimilation,Temperate climate,SULFATE-REDUCING BACTERIA,ARBUSCULAR MYCORRHIZAL FUNGI,ELEVATED ATMOSPHERIC CO2,PHOSPHOLIPID FATTY-ACIDS,IN-SITU,CYANOBACTERIAL MATS,ORGANIC-MATTER,CARBON FLOW,SALT-MARSH,SOIL},
  language     = {eng},
  number       = {3},
  pages        = {333--341},
  title        = {Temporal variation of rhizodeposit-C assimilating microbial communities in a natural wetland},
  url          = {http://dx.doi.org/10.1007/s00374-012-0729-7},
  volume       = {49},
  year         = {2013},
}

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