Differences

This shows you the differences between two versions of the page.

--- wiki:biomass_production_from_grassland_-_supply [2018/07/11 11:44] – sebastian
+++ wiki:biomass_production_from_grassland_-_supply [2018/07/12 11:19] (current) – eurac
@@ Line 1: / Line 1: @@
-==== Biomass production from grassland - Supply ====
+====== Biomass production from grassland - Supply ======
-==== General description: ====
+==== General description ====
 The approach presented here is comprised of two main parts. The first part (steps 1 and 2) assesses the **optimal yield** (ES potential) according to the length of the growing season, the respective growth functions and the specific land use types. The second part refines the biomass productivity according to region-specific precipitation patterns (steps 3 to 7) and local small-scale topographic conditions (steps 8 to 10), in order to provide more reliable **local yield estimates ** (ES status). **Figure 1 **describes in detail the calculation procedure to derive the Supply (DM kg/ha) for each local administrative units (LAU2) of the Alpine Space.
-==== Input data: ====
+==== Input data ====
   * DEM (slope, aspect) * Precipitation (in mm) * Climate Data (number of Vegetation days, start of growing season) * Land use types (intensively used, moderately used and extensively used grassland, Natural Grassland (CLC)…)
-==== Calculation processes: ====
+==== Calculation processes ====
 <font 14px/inherit;;black;;inherit>**(1) Calculate Vegetation Days** (days with// T//</font><sub><font inherit/inherit;;black;;inherit>mean</font></sub><font inherit/inherit;;black;;inherit>≥ 5 C)</font>
@@ Line 53: / Line 53: @@
 <font 14px/inherit;;inherit;;inherit>**(8) Calculate slope yield**</font>
-  * <font 14px/inherit;;inherit;;inherit>Calculate the yield reduction caused by slope because of radiation reduction</font>     * <font 14px/inherit;;inherit;;inherit>the slope is > 10, **then** use the following formula [(1- (Slope/ 100)) * regional yield], **else** keep the regional yield value.</font>
+  * <font 14px/inherit;;inherit;;inherit>Calculate the yield reduction caused by slope because of radiation reduction</font>* <font 14px/inherit;;inherit;;inherit>the slope is > 10, **then** use the following formula [(1- (Slope/ 100)) * regional yield], **else** keep the regional yield value.</font>
 <font 14px/inherit;;inherit;;inherit>**(9) Reclassify **the “Aspect raster” to “Aspect modified” in preparation of step (10)</font>
-  * <font 14px/inherit;;inherit;;inherit>For the purposes of the model, simplified aspect values are required that account for losses caused by radiation decrease due to unfavorable exposition. Only values between 0° (north) – 180° (south) are valid inputs, where 90° refers to both east and west exposition. The reduction factors range between 0% and 20%, respectively for southerly and northerly facing slopes. We applied a linear distribution of the **reduction factor** from south to north.</font>  * <font 14px/inherit;;inherit;;inherit>Hence, first aspect values have to be reclassified and inverted using the following form</font>ula: <font 14px/inherit;;inherit;;inherit>**//aspect_recl =//**</font>//<font 14px/inherit;;inherit;;inherit></font>**<font 14px/inherit;;inherit;;inherit>180 - (180 - (Aspect - 180)</font>**  //
+  * <font 14px/inherit;;inherit;;inherit>For the purposes of the model, simplified aspect values are required that account for losses caused by radiation decrease due to unfavorable exposition. Only values between 0° (north) – 180° (south) are valid inputs, where 90° refers to both east and west exposition. The reduction factors range between 0% and 20%, respectively for southerly and northerly facing slopes. We applied a linear distribution of the **reduction factor** from south to north.</font>* <font 14px/inherit;;inherit;;inherit>Hence, first aspect values have to be reclassified and inverted using the following form</font>ula: <font 14px/inherit;;inherit;;inherit>**//aspect_recl =//**</font>//**<font 14px/inherit;;inherit;;inherit>180 - (180 - (Aspect - 180)</font>** //
   * <font 14px/inherit;;inherit;;inherit>And second, this raster has to be multiplied with its specific **reduction factor**. **//Aspect modified = aspect_recl * reduction factor//**</font>
@@ Line 64: / Line 64: @@
 <font 14px/inherit;;inherit;;inherit>**(10) Calculate local yield**</font>
-  * <font 14px/inherit;;inherit;;inherit>In the final step local yield is calculated without the losses caused by exposition:</font>     * <font 14px/inherit;;inherit;;inherit>the Annual Precipitation <= 1500 mm **then** use the following formula: [(100 - (Aspect modified / 2)) / 100) * Slope Yield] **else** this other formula [((100 – Aspect modified) / 100) * Slope Yield)].</font>
+  * <font 14px/inherit;;inherit;;inherit>In the final step local yield is calculated without the losses caused by exposition:</font>* <font 14px/inherit;;inherit;;inherit>the Annual Precipitation <= 1500 mm **then** use the following formula: [(100 - (Aspect modified / 2)) / 100) * Slope Yield] **else** this other formula [((100 – Aspect modified) / 100) * Slope Yield)].</font>
-__<font 10.0pt/inherit;;inherit;;inherit>References:</font>__
+__<font 12px/inherit;;inherit;;inherit>References:</font>__
-<font 10.0pt/inherit;;inherit;;inherit>Krautzer, Bernhard, Christian Uhlig, and Helmut Wittmann. "Restoration of Arctic–Alpine Ecosystems."</font><font 10.0pt/inherit;;inherit;;inherit>Restoration Ecology: The New Frontier 189 (2012)</font>
+__<font 12px/inherit;;inherit;;inherit>Krautzer, Bernhard, Christian Uhlig, and Helmut Wittmann. "Restoration of Arctic–Alpine Ecosystems."Restoration Ecology: The New Frontier 189 (2012)</font>__
-<font 10.0pt/inherit;;inherit;;inherit>Egger, G., et al. (2004). GIS-gestützte Ertragsmodellierung zur Optimierung des Weidemanagements auf Almweiden.</font><font 10.0pt/inherit;;inherit;;inherit>Irdning, Irdning: BAL. modified by Jaeger and Tasser et al.</font>
+__<font 12px/inherit;;inherit;;inherit>Egger, G., et al. (2004). GIS-gestützte Ertragsmodellierung zur Optimierung des Weidemanagements auf Almweiden.Irdning, Irdning: BAL. modified by Jaeger and Tasser et al.</font>__
-<font 10.0pt/inherit;;inherit;;inherit>Urthaler, K. (2016). Modellierung und Validierung des landwirtschaftlichen Ertrages der Grünlandflächen Südtirols. Institut für Ökologie. Innsbruck, Leopold Franzens Universität. Master of Science</font>
+__<font 12px/inherit;;inherit;;inherit>Urthaler, K. (2016). Modellierung und Validierung des landwirtschaftlichen Ertrages der Grünlandflächen Südtirols. Institut für Ökologie. Innsbruck, Leopold Franzens Universität. Master of Science</font>__
 \\