The role of the atmosphere in nitrogen cycling

1982 ◽  
Vol 67 (1-3) ◽  
pp. 61-71 ◽  
Author(s):  
E. Sanhueza
Keyword(s):  
Nitrogen Cycling

Nitrogen cycling and export in California chaparral: the role of climate in shaping ecosystem responses to fire

2016 ◽  
Vol 87 (1) ◽  
pp. 76-90 ◽  
Author(s):  
Erin J. Hanan ◽  
Christina Naomi Tague ◽  
Joshua P. Schimel
Keyword(s):  
Nitrogen Cycling ◽  
Ecosystem Responses

scholarly journals Micro-aggregation of a pristine grassland soil selects for bacterial and fungal communities and changes in nitrogen cycling potentials

2021 ◽  
Author(s):  
Christoph Keuschnig ◽  
Jean Martins ◽  
Aline Navel ◽  
Pascal Simonet ◽  
Catherine Larose
Keyword(s):  
Particle Size ◽  
Nitrogen Cycling ◽  
Bacterial Communities ◽  
Soil Microbial Communities ◽  
Microbial Interactions ◽  
Fungal Communities ◽  
Supernatant Fraction ◽  
Soil Microbial ◽  
Microbial Analysis

Microbial analysis at the micro scale of soil is essential to the overall understanding of microbial organization and interactions, and necessary for a better understanding of soil ecosystem functioning. While bacterial communities have been extensively described, little is known about the organization of fungal communities as well as functional potentials at scales relevant to microbial interactions. Fungal and bacterial communities and changes in nitrogen cycling potentials in the pristine Rothamsted Park Grass soil (bulk soil) as well as in its particle size sub-fractions (PSFs; > 250 µm, 250-63 µm, 63-20 µm, 20-2 µm, < 2 µm and supernatant) were studied. The potential for nitrogen reduction was found elevated in bigger aggregates. The relative abundance of Basidiomycota deceased with decreasing particle size, Ascomycota showed an increase and Mucoromycota became more prominent in particles less than 20 µm. Bacterial community structures changed below 20 µm at the scale where microbes operate.Strikingly, only members of two bacterial and one fungal phyla (Proteobacteria, Bacteroidota and Ascomycota, respectively) were washed-off the soil during fractionation and accumulated in the supernatant fraction where most of the detected bacterial genera (e.g., Pseudomonas, Massilia, Mucilaginibacter, Edaphobaculum, Duganella, Janthinobacterium and Variovorax) were previously associated with exopolysaccharide production and biofilm formation.Overall, the applied method shows potential to study soil microbial communities at micro scales which might be useful in studies focusing on the role of specific fungal taxa in soil structure formation as well as research on how and by whom biofilm-like structures are distributed and organized in soil.

The Nitrogen Cycle and Climate

2019 ◽  
pp. 176-193
Author(s):  
Han Dolman
Keyword(s):  
Nitrous Oxide ◽  
Nitrogen Cycling ◽  
Nitrogen Cycle ◽  
World Population ◽  
Human Intervention ◽  
Aerosol Formation ◽  
The Impact ◽  
Anammox Process ◽  
Land Water

The nitrogen cycle is described, together with its denitrification and nitrification processes, including the Anammox process. The importance of human intervention through the Haber–Bosch process is shown by identifying the tremendous growth of agricultural food production for a growing world population. The processes of emission of nitrous oxide from the ocean and land are described. The role of reactive nitrogen in cascading through land water into the ocean, where it provides eutrophication in coastal areas, is also described, as is the role of nitrogen in aerosol formation. The geological record of nitrogen cycling is then discussed in relation to Earth’s oxygenation. The impact of nitrogen on the carbon cycle is also discussed.

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