IMAGE framework summary/Earth system: Difference between revisions
Jump to navigation
Jump to search
m (Text replace - "Natural vegetation and carbon cycle" to "Carbon cycle and natural vegetation") |
m (Text replace - "Nutrient balances" to "Nutrients") |
||
| Line 17: | Line 17: | ||
{{DisplayFigureLeftOptimalTemplate|Baseline figure H II}} | {{DisplayFigureLeftOptimalTemplate|Baseline figure H II}} | ||
===Nutrients=== | ===Nutrients=== | ||
The Global Nutrient model describes the fate of nitrogen (N) and phosphorus (P) emerging from concentrated point sources, such as human settlements, and from dispersed or non-point sources, such as agricultural and natural land (Component [[ | The Global Nutrient model describes the fate of nitrogen (N) and phosphorus (P) emerging from concentrated point sources, such as human settlements, and from dispersed or non-point sources, such as agricultural and natural land (Component [[Nutrients]]). The nutrient surplus eventually enters coastal water bodies via rivers and lakes. Key drivers that determine nutrient emissions include agricultural production with fertiliser application, and urban and rural populations, and their sanitation systems and level of wastewater treatment. For example, the model calculates the soil nitrogen balance from the total set of inputs and outputs. Inputs include biological nitrogen fixation, atmospheric nitrogen deposition, and application of synthetic nitrogen fertiliser and animal manure. Outputs include nitrogen removal from the field by crop harvesting, grass-cutting and grazing. The nutrient outflow from the soil combined with emissions from point sources and direct atmospheric deposition determine the loading of nutrients to surface water. | ||
<BlockQuote> | <BlockQuote> | ||
Example: In the Rio+20 scenario, further increase in the global population and growth of agricultural production add to pressures on the nutrient cycle. While increasing wastewater treatment and improved agricultural practices mitigate some of the increased nutrient loading, these processes are insufficient to offset increased fertiliser application to sustain intense agriculture. This leads to a significant further imbalance in nitrogen and phosphorus cycles, with consequences for water quality in rivers, lakes and coastal seas. | Example: In the Rio+20 scenario, further increase in the global population and growth of agricultural production add to pressures on the nutrient cycle. While increasing wastewater treatment and improved agricultural practices mitigate some of the increased nutrient loading, these processes are insufficient to offset increased fertiliser application to sustain intense agriculture. This leads to a significant further imbalance in nitrogen and phosphorus cycles, with consequences for water quality in rivers, lakes and coastal seas. | ||
Revision as of 09:16, 17 May 2014
| Projects/Applications |
| Relevant overviews |
| Key publications |
| References |