Threats to the Integrity of the Nitrogen Cycle: Nitrogen Compounds in Soil, Water, Atmosphere and Precipitation

1975 ◽  
pp. 341-366 ◽  
Author(s):  
Barry Commoner
Keyword(s):  
Soil Water ◽  
Nitrogen Cycle ◽  
Nitrogen Compounds

scholarly journals Nitrogen Cycle: Impact on Global Environment

2018 ◽  
pp. 42-52
Author(s):  
Yul Ho
Keyword(s):  
Nitrogen Cycle ◽  
Marine Ecosystems ◽  
Global Environment ◽  
Biogeochemical Cycle ◽  
Nitrogen Compounds ◽  
Chemical Forms ◽  
Atmospheric Nitrogen ◽  
Physical Processes ◽  
Schematic Representation ◽  
Multiple Chemical

Schematic representation of the flow of nitrogen through the ecosystem. The importance of bacteria in the cycle is immediately recognized as being a key element in the cycle, providing different forms of nitrogen compounds assailable by higher organisms. The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmosphere, terrestrial, and marine ecosystems. The conversion of nitrogen can be carried out through both biological and physical processes. Important processes in the nitrogen cycle include fixation, ammonification, nitrification, and denitrification. The majority of Earth's atmosphere (78%) is atmosphere nitrogen, making it the largest source of nitrogen. However, atmospheric nitrogen has limited availability for biological use, leading to a scarcity of usable nitrogen in many types of ecosystems.

Contributions of Microorganisms to Nitrogen Cycle of Wuyiling Wetland in Yichun in Northeast China

2011 ◽  
Vol 418-420 ◽  
pp. 2286-2289
Author(s):  
Ji Guang Li ◽  
Yi Bin Ren ◽  
Nan Qi Ren ◽  
Chun Wen Yang ◽  
Chun Sheng Zuo ◽  
...  
Keyword(s):  
Nitrogen Cycle ◽  
Northeast China ◽  
Sewage Treatment ◽  
Urban Ecosystem ◽  
Nitrogen Compounds ◽  
Ammonium Oxidation ◽  
Wetland Ecosystem ◽  
North Shore ◽  
Urban Wetland ◽  
Main Factor

Wetland is the important part in urban ecosystem. Microorganisms is integral component of urban wetland ecosystem is the main factor of wetlands sewage treatment, and plays an irreplaceable role in the degradation. In this paper, the authors regard urban wetland of Yichun in north shore of Tangwang river as the research object, through experiments to identify the microorganisms types, finding five microorganisms types being nitrify fungi. The article analyzes the contributions of microorganisms in nitrogen cycle of urban wetland. It is present that microorganisms plays an irreplaceable role in controlling pollutions and nitrification and anti-nitrification reactions play the most significant role in the degradation of nitrogen compounds and ammonium oxidation is a possible process in deducing nitrogen pollutions.

Influence of Microorganisms on Nitrogen Cycle of Urban Wetland in Northeast China

2012 ◽  
Vol 518-523 ◽  
pp. 5055-5058 ◽  
Author(s):  
Ji Guang Li ◽  
Yi Bin Ren ◽  
Shuang Qi Tian ◽  
Qi Shuo Wang ◽  
Ji Wei He ◽  
...  
Keyword(s):  
Nitrogen Cycle ◽  
Northeast China ◽  
Sewage Treatment ◽  
Urban Ecosystem ◽  
Nitrogen Compounds ◽  
Ammonium Oxidation ◽  
Songhua River ◽  
North Shore ◽  
Urban Wetland ◽  
Main Factor

Wetland is the important part in urban ecosystem. Microorganisms is integral component of urban wetland ecosystem is the main factor of wetlands sewage treatment, and plays an irreplaceable role in the degradation. In this paper, the authors regard urban wetland of Harbin in north shore of Songhua river as the research object, through experiments to identify the microorganisms types, finding five microorganisms types being nitrify fungi. The article analyzes the contributions of microorganisms in nitrogen cycle of urban wetland. It is present that microorganisms plays an irreplaceable role in controlling pollutions and nitrification and anti-nitrification reactions play the most significant role in the degradation of nitrogen compounds and ammonium oxidation is a possible process in deducing nitrogen pollutions.

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