scholarly journals Tracing carbon and nitrogen incorporation and pathways in the microbial community of a photic subtidal sand

2008 ◽  
Vol 53 ◽  
pp. 257-269 ◽  
Author(s):  
V Evrard ◽  
PLM Cook ◽  
B Veuger ◽  
M Huettel ◽  
JJ Middelburg
Keyword(s):  
Microbial Community ◽  
Carbon And Nitrogen ◽  
Nitrogen Incorporation

scholarly journals Macrofauna regulate heterotrophic bacterial carbon and nitrogen incorporation in low-oxygen sediments

2012 ◽  
Vol 6 (11) ◽  
pp. 2140-2151 ◽  
Author(s):  
William R Hunter ◽  
Bart Veuger ◽  
Ursula Witte
Keyword(s):  
Low Oxygen ◽  
Carbon And Nitrogen ◽  
Nitrogen Incorporation

scholarly journals Hydration status and diurnal trophic interactions shape microbial community function in desert biocrusts

2017 ◽  
Vol 14 (23) ◽  
pp. 5403-5424 ◽  
Author(s):  
Minsu Kim ◽  
Dani Or
Keyword(s):  
Microbial Community ◽  
Microbial Communities ◽  
Mechanistic Model ◽  
Soil Surface ◽  
Hydration Status ◽  
Carbon And Nitrogen ◽  
Community Function ◽  
Diurnal Cycles ◽  
Biogeochemical Fluxes ◽  
Biogeochemical Hotspots

Abstract. Biological soil crusts (biocrusts) are self-organised thin assemblies of microbes, lichens, and mosses that are ubiquitous in arid regions and serve as important ecological and biogeochemical hotspots. Biocrust ecological function is intricately shaped by strong gradients of water, light, oxygen, and dynamics in the abundance and spatial organisation of the microbial community within a few millimetres of the soil surface. We report a mechanistic model that links the biophysical and chemical processes that shape the functioning of biocrust representative microbial communities that interact trophically and respond dynamically to cycles of hydration, light, and temperature. The model captures key features of carbon and nitrogen cycling within biocrusts, such as microbial activity and distribution (during early stages of biocrust establishment) under diurnal cycles and the associated dynamics of biogeochemical fluxes at different hydration conditions. The study offers new insights into the highly dynamic and localised processes performed by microbial communities within thin desert biocrusts.

Microbial responses to carbon and nitrogen supplementation in an Antarctic dry valley soil

2012 ◽  
Vol 25 (1) ◽  
pp. 55-61 ◽  
Author(s):  
P.G. Dennis ◽  
A.D. Sparrow ◽  
E.G. Gregorich ◽  
P.M. Novis ◽  
B. Elberling ◽  
...  
Keyword(s):  
Microbial Community ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Soil Microbial Community ◽  
Control Treatment ◽  
Dry Valleys ◽  
Carbon Addition ◽  
Carbon And Nitrogen ◽  
Soil Microbial ◽  
Organic Carbon Concentration

AbstractThe soils of the McMurdo Dry Valleys are exposed to extremely dry and cold conditions. Nevertheless, they contain active biological communities that contribute to the biogeochemical processes. We have used ester-linked fatty acid (ELFA) analysis to investigate the effects of additions of carbon and nitrogen in glucose and ammonium chloride, respectively, on the soil microbial community in a field experiment lasting three years in the Garwood Valley. In the control treatment, the total ELFA concentration was small by comparison with temperate soils, but very large when expressed relative to the soil organic carbon concentration, indicating efficient conversion of soil organic carbon into microbial biomass and rapid turnover of soil organic carbon. The ELFA concentrations increased significantly in response to carbon additions, indicating that carbon supply was the main constraint to microbial activity. The large ELFA concentrations relative to soil organic carbon and the increases in ELFA response to organic carbon addition are both interpreted as evidence for the soil microbial community containing organisms with efficient scavenging mechanisms for carbon. The diversity of the ELFA profiles declined in response to organic carbon addition, suggesting the responses were driven by a portion of the community increasing in dominance whilst others declined.

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