Nitrogen Cycle Essay Questions

Nitrogen Cycle Essay Questions-42
Elevated nitrate in groundwater is a concern for drinking water use because nitrate can interfere with blood-oxygen levels in infants and cause methemoglobinemia or blue-baby syndrome.Where groundwater recharges stream flow, nitrate-enriched groundwater can contribute to eutrophication, a process that leads to high algal population and growth, especially blue-green algal populations.

Elevated nitrate in groundwater is a concern for drinking water use because nitrate can interfere with blood-oxygen levels in infants and cause methemoglobinemia or blue-baby syndrome.Where groundwater recharges stream flow, nitrate-enriched groundwater can contribute to eutrophication, a process that leads to high algal population and growth, especially blue-green algal populations.

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Atmospheric nitrogen must be processed, or "fixed", into a usable form to be taken up by plants.

Between 5 and 10 billion kg per year are fixed by lightning strikes, but most fixation is done by free-living or symbiotic bacteria known as diazotrophs.

Since 2006, the application of nitrogen fertilizer has been increasingly controlled in Britain and the United States.

This is occurring along the same lines as control of phosphorus fertilizer, restriction of which is normally considered essential to the recovery of eutrophied waterbodies. This process is performed by bacterial species such as Pseudomonas and Paracoccus, under anaerobic conditions.

Utilization of various N sources is carefully regulated in all organisms.

When a plant or animal dies or an animal expels waste, the initial form of nitrogen is organic.

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 able to be assimilated 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.

In plants that have a symbiotic relationship with rhizobia, some nitrogen is assimilated in the form of ammonium ions directly from the nodules.

It is now known that there is a more complex cycling of amino acids between Rhizobia bacteroids and plants.

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