Nutrients: Difference between revisions

From IMAGE
Jump to navigation Jump to search
No edit summary
No edit summary
Line 6: Line 6:
|InputVar=Population; GDP per capita; Land cover, land use - grid;  Fertilizer use efficiency; Animal stock; Livestock ration; Manure spreading fraction; Nitrogen deposition - grid; NH3 loss; Fraction of urban population; Actual crop and grass production - grid;
|InputVar=Population; GDP per capita; Land cover, land use - grid;  Fertilizer use efficiency; Animal stock; Livestock ration; Manure spreading fraction; Nitrogen deposition - grid; NH3 loss; Fraction of urban population; Actual crop and grass production - grid;
|OutputVar=NH3 emission - grid; N and P discharge to surface water;  Nutrient discharge to water surface; Soil N budget - grid; Soil P budget - grid;
|OutputVar=NH3 emission - grid; N and P discharge to surface water;  Nutrient discharge to water surface; Soil N budget - grid; Soil P budget - grid;
|Parameter=Fraction NH3 loss;  
|Parameter=Fraction NH3 loss;
|Description=Human activities have accelerated the earth’s biogeochemical nitrogen (N) and phosphorus (P) cycles by increasing the use of fertilisers in agriculture ([[Bouwman et al., 2011]]). The changes in global nutrient cycles have both positive and negative effects. Increased use of N and P fertilisers has allowed for an increase in the production of food required to support a rapidly growing human population, and increasing per-capita consumption of particularly meat and milk ([[Galloway et al., 2004]]). This has also contributed to ongoing increases in yields, thereby making agriculture economically viable on a land area that has expanded much less than the harvested output. A side effect is that significant fractions of the mobilised N are lost through the emission of ammonia (NH3), nitrous oxide (N2O) and nitric oxide (NO) to ambient air. Ammonia contributes to eutrophication and acidification when deposited on land. Nitric oxide plays a role in tropospheric ozone chemistry, and nitrous oxide is a potent greenhouse gas. Also, large fractions of the mobilised N and P in watersheds enter the groundwater through leaching, and are released to surface waters through groundwater transport and surface runoff. Subsequently, nutrients in streams and rivers are transported towards coastal marine systems, reduced by retention but augmented by releases from point sources, such as sewage systems and industrial facilities.
|Description=Human activity has accelerated the Earth’s biogeochemical nitrogen (N) and phosphorus (P) cycles through increasing fertiliser use in agriculture ([[Bouwman et al., 2011]]). Increased use of N and P fertilisers has raised food production to support the rapidly growing world population, and increasing per capita consumption particularly of meat and milk ([[Galloway et al., 2004]]). Increased fertiliser use has contributed to ongoing increases in crop yields.  
This has resulted in numerous negative impacts on human health and the environment, such as groundwater pollution, loss of habitat and biodiversity, an increases in the frequency and severity of harmful algal blooms, eutrophication, hypoxia and fish kills ([[Diaz and Rosenberg, 2008]]; [[Zhang et al., 2010]]). Such harmful effects of eutrophication have been spreading rapidly around the world, with large-scale implications for biodiversity, water quality, fisheries and recreation, in both industrialised and developing regions ([[UNEP, 2002]]). In freshwater and coastal marine ecosystems it is not only the input of nutrients but also the disturbance of the stoichiometric balance of N, P and silica (Si) ([[Rabalais, 2002]]) that affect both the total plant production and the species that dominate the ecosystems.
A side effect is that significant proportions of the mobilised N are lost through ambient emissions of ammonia (NH3), nitrous oxide (N2O) and nitric oxide (NO). Ammonia contributes to eutrophication and acidification when deposited on land. Nitric oxide plays a role in tropospheric ozone chemistry, and nitrous oxide is a potent greenhouse gas. Moreover, large proportions of mobilised N and P in watersheds enter the groundwater through leaching, and are released to surface waters through groundwater transport and surface runoff. Subsequently, nutrients in streams and rivers are transported to coastal marine systems, reduced by retention but augmented by releases from point sources, such as sewerage systems and industrial facilities.
To assess eutrophication as a consequence of changing population, economy and technological development, IMAGE 3.0 includes a nutrient model with three submodels:
This has resulted in negative impacts on human health and the environment, such as groundwater pollution, loss of habitat and biodiversity, an increases in the frequency and severity of harmful algal blooms, eutrophication, hypoxia and fish kills ([[Diaz and Rosenberg, 2008]]; [[Zhang et al., 2010]]). The harmful effects of eutrophication have spread rapidly around the world, with large-scale implications for biodiversity, water quality, fisheries and recreation, in both industrialised and developing regions ([[UNEP, 2002]]). Input of nutrients in freshwater and coastal marine ecosystems, also disturbs the stoichiometric balance of N, P and silica (Si) ([[Rabalais, 2002]]) affecting  total plant production and the species composition in ecosystems.
# The Wastewater model (See figure on the right I), which generates nutrient flows in wastewater discharges;
To assess eutrophication as a consequence of increasing population, and economic and technological development, IMAGE 3.0 includes a nutrient model, which comprises three sub-models:
# The Soil nutrient budget model (See figure on the right II), describing all input and output of N and P in soil compartments;
# Wastewater emissions  to generate nutrient flows in wastewater discharges  (See figure on the right I);
# The Nutrient environmental fate model (See figure on the right III), which describes the fate of soil nutrient surpluses and wastewater nutrients in the aquatic environment.
# Soil nutrient budget to describe all input and output of N and P in soil compartments (See figure on the right II);
# Nutrient environmental fate  to describe the fate of soil nutrient surpluses and wastewater nutrients in the aquatic environment, (See figure on the right III).
|ComponentCode=N
|ComponentCode=N
|FrameworkElementType=state component
|FrameworkElementType=state component
}}
}}

Revision as of 10:48, 12 February 2014

link to framework components overview

Parts of Nutrients

  1. Introduction page
  2. Model description
  3. Policy issues
  4. Data, uncertainty and limitations
  5. Overview of references
Component is implemented in:
Components:
Related IMAGE components
Projects/Applications
Key publications
References
Nutrient module of IMAGE 3.0
Flowchart Nutrients. See also the Input/Output Table on the introduction page.

Key policy issues

  • How will the increasing use of fertilisers affect terrestrial and marine ecosystems, with possible consequences for human health?
  • To what extent can the negative impacts be reduced by more efficient nutrient management and wastewater treatment, while retaining the positive effects on food production and land productivity?

Introduction

Retrieved from "https://models.pbl.nl/index.php?title=Nutrients&oldid=16913"