scholarly journals Evolution of the nitrogen cycle and its influence on the biological sequestration of CO2 in the ocean

Nature ◽  
1997 ◽  
Vol 387 (6630) ◽  
pp. 272-275 ◽  
Author(s):  
Paul G. Falkowski
Keyword(s):  
Nitrogen Cycle ◽  
Sequestration Of Co2 ◽  
Biological Sequestration

Analysis of cultivable heterotrophic bacteria involved in nitrogen cycle in grass carp(Ctenopharyngodon idellus)pond

2012 ◽  
Vol 36 (10) ◽  
pp. 1572 ◽  
Author(s):  
Luo-qin FU ◽  
Jian-dong SUN ◽  
Bin DENG ◽  
Quan LIANG ◽  
Xiao-ping ZHANG ◽  
...  
Keyword(s):  
Nitrogen Cycle ◽  
Grass Carp ◽  
Heterotrophic Bacteria ◽  
Ctenopharyngodon Idellus

scholarly journals Ammonia-oxidizing archaea are integral to nitrogen cycling in a highly fertile agricultural soil

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Laibin Huang ◽  
Seemanti Chakrabarti ◽  
Jennifer Cooper ◽  
Ana Perez ◽  
Sophia M. John ◽  
...  
Keyword(s):  
Nitrogen Cycle ◽  
Agricultural Soil ◽  
Agricultural Soils ◽  
Ammonia Oxidizing Bacteria ◽  
Central Process ◽  
Soil Nitrification ◽  
Plant Nitrogen ◽  
Ammonia Oxidizing Archaea ◽  
Activity Measurements ◽  
Nitrite Oxidizing Bacteria

AbstractNitrification is a central process in the global nitrogen cycle, carried out by a complex network of ammonia-oxidizing archaea (AOA), ammonia-oxidizing bacteria (AOB), complete ammonia-oxidizing (comammox) bacteria, and nitrite-oxidizing bacteria (NOB). Nitrification is responsible for significant nitrogen leaching and N2O emissions and thought to impede plant nitrogen use efficiency in agricultural systems. However, the actual contribution of each nitrifier group to net rates and N2O emissions remain poorly understood. We hypothesized that highly fertile agricultural soils with high organic matter mineralization rates could allow a detailed characterization of N cycling in these soils. Using a combination of molecular and activity measurements, we show that in a mixed AOA, AOB, and comammox community, AOA outnumbered low diversity assemblages of AOB and comammox 50- to 430-fold, and strongly dominated net nitrification activities with low N2O yields between 0.18 and 0.41 ng N2O–N per µg NOx–N in cropped, fallow, as well as native soil. Nitrification rates were not significantly different in plant-covered and fallow plots. Mass balance calculations indicated that plants relied heavily on nitrate, and not ammonium as primary nitrogen source in these soils. Together, these results imply AOA as integral part of the nitrogen cycle in a highly fertile agricultural soil.

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