Difference between revisions of "Land degradation/Policy issues"

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|Description=The land degradation model in its current state is used to explore changes in degradation risk over time. Module A for Water Erosion Sensitivity is used to assess risks of soil erosion by water. Resulting maps are used to identify the most sensitive regions, and how areas under different risk categories change over time and space, subject to scenarios of future land use and climate change (Figure Policy interventions).
 
|Description=The land degradation model in its current state is used to explore changes in degradation risk over time. Module A for Water Erosion Sensitivity is used to assess risks of soil erosion by water. Resulting maps are used to identify the most sensitive regions, and how areas under different risk categories change over time and space, subject to scenarios of future land use and climate change (Figure Policy interventions).
  
Module B for Human-Induced Soil Changes is used to estimate how historical land degradation propagates through the IMAGE 3.0 framework via change in topsoil depth, soil organic matter content and hydrologic soil properties. As a result of changing soil properties, agricultural productivity calculated by the [[LPJmL model]] can change (Figure below). This module is used for future projections to assess the effect of climate change , land-use change, land cover change (as vegetation cover), and restoration activities on soil properties, and to study the impact of these changes on crop production, hydrology, and land-use dynamics.  
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Module B for Human-Induced Soil Changes is used to estimate how historical land degradation propagates through the IMAGE 3.0 framework via change in topsoil depth, soil organic matter content and hydrologic soil properties. As a result of changing soil properties, agricultural productivity calculated by the [[LPJmL model]] can change (Figure below). This module is used for future projections to assess the effect of climate change , land-use change, land cover change (as vegetation cover), and restoration activities on soil properties, and to study the impact of these changes on crop production, hydrology, and land-use dynamics.
 
 
 
|Example=The modules on soil degradation are used in the IMAGE framework to calculate the impacts of changes in factors driving risks of degradation, such as changes in land use or climate. This is illustrated with the [[Rio+20]] study by comparing the development of the Water Erosion Sensitivity Index under the baseline scenario with a sustainability scenario (Global technology). Areas characterised by high and very high risk increase strongly by 2050 with the development of land use and climate change under the baseline scenario by 33% and 69%, respectively, compared to 2010 levels (Figure blow). Under the Global Technology scenario, most of the increased risk is avoided because of less demand for agricultural land and reduction in climate change.
 
|Example=The modules on soil degradation are used in the IMAGE framework to calculate the impacts of changes in factors driving risks of degradation, such as changes in land use or climate. This is illustrated with the [[Rio+20]] study by comparing the development of the Water Erosion Sensitivity Index under the baseline scenario with a sustainability scenario (Global technology). Areas characterised by high and very high risk increase strongly by 2050 with the development of land use and climate change under the baseline scenario by 33% and 69%, respectively, compared to 2010 levels (Figure blow). Under the Global Technology scenario, most of the increased risk is avoided because of less demand for agricultural land and reduction in climate change.
  
Both modules take into account climate change and land-use change and the effects on erosion risk and soil properties. The modules may be used to assess impact on the erosion risk of all policy interventions affecting climate and land use. However, the modules do not contain specific small-scale measures to reduce the degradation risks, such as reduced tillage and soil conservation practices. Future scenario studies could assess the aggregated effect of land-conservation-oriented policy interventions on the basis of more detailed relationships between agricultural practices and the land use intensity factor, fLUI, in module B.  
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Both modules take into account climate change and land-use change and the effects on erosion risk and soil properties. The modules may be used to assess impact on the erosion risk of all policy interventions affecting climate and land use. However, the modules do not contain specific small-scale measures to reduce the degradation risks, such as reduced tillage and soil conservation practices. Future scenario studies could assess the aggregated effect of land-conservation-oriented policy interventions on the basis of more detailed relationships between agricultural practices and the land use intensity factor, f<sub>LUI</sub>, in module B.
 
 
 
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Revision as of 12:02, 19 May 2014