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net.simplace.sim.components.experimental.intercropping.BelowgroundAllocationFactor

Calculates factors for below ground allocation of two crops from their root distribution.

The module uses a straigthforward approach:

Root Length Densities (RLD) and Root Restriction Factors (RRF) are scaled according to the area covered by each crop
Common RLD and RRF are just the sum of the scaled RLDs and RRFs
Below ground allocation factors are proportional to the scaled RRFs

Calculation

Root Length Densities per layer $rld_{1,i}, rld_{2,i}$ and are scaled to the coresponding area fractions $a_1, a_2$ occupied by the two crops and the sum of both is calculated.

\[ rld_i = rld_{1,i} \cdot a_1 + rld_{2,i} \cdot a_2 \]

Same holds for Root Restriction Factors per Layer $rrf_{1,i}, rrf_{2,i}$ \[ rrf_i = rrf_{1,i} \cdot a_1 + rrf_{2,i} \cdot a_2 \]

The maximum rooted layer is the biggest layer number, where Root Length Density is greater than 0. \[ n_{max} = max\{i | rld_i > 0\} \]

To calculate the allocations factors $f_1, f_2$, first the total sum of root restriction factors is calculated \[ s = \sum_i rrf_{1_i} + \sum_i rrf_{2,i} \]

then the factor per layer is the root restriction factor per layer divided by the sum

\[ f_{1,i} = \frac{rff_{1,i}}{s} \quad \quad f_{2,i} = \frac{rff_{2,i}}{s} \]

To get the total factors, the factor per per layers are summed up

\[ f_1 = \sum_i f_{1,i} \quad \quad f_2 = \sum_i f_{2,i} \]

References

Component Variables

Content Type	Name	Description	Data Type	Unit	Min Value	Max Value	Default Value
constant	cAreaFraction1	Area fraction covered by crop 1	DOUBLE	1	0.0	1.0	0.0
constant	cAreaFraction2	Area fraction covered by crop 2	DOUBLE	1	0.0	1.0	0.0
input	iRootLengthDensity1	Root length density per layer of crop 1	DOUBLEARRAY	cm/cm3	0.0	-	-
input	iRootLengthDensity2	Root length density per layer of crop 2	DOUBLEARRAY	cm/cm3	0.0	-	-
input	iRootRestrictionFactor1	root restriction factor per layer of crop 1	DOUBLEARRAY	1	0.0	-	-
input	iRootRestrictionFactor2	root restriction factor per layer of crop 2	DOUBLEARRAY	1	0.0	-	-
out	Factor1	Below ground allocation factor for crop 1	DOUBLE	1	0.0	1.0	0.0
out	Factor1PerLayer	Below ground allocation factor for crop 1 per layer	DOUBLEARRAY	1	0.0	1.0	-
out	Factor2	Below ground allocation factor for crop 2	DOUBLE	1	0.0	1.0	0.0
out	Factor2PerLayer	Below ground allocation factor for crop 2 per layer	DOUBLEARRAY	1	0.0	1.0	-
out	MaxRootedLayerNumber	Highest layer number that contains roots	INT		0	-	0
out	RootLengthDensity	Root length density per layer of both crops	DOUBLEARRAY	cm/cm3	0.0	-	-
out	RootRestrictionFactor	Averaged root restriction factor per layer of both crops	DOUBLEARRAY	1	0.0	-	-

See also: RadiationInterception, IntercroppingFunctions, SplitWaterUptake

public class BelowgroundAllocationFactor extends
net.simplace.sim.model.FWSimComponent {
// Public Constructors
public BelowgroundAllocationFactor();
// Protected Constructors
protected BelowgroundAllocationFactor(String aName, HashMap aFieldMap,
HashMap aInputMap, Element aSimComponentElement, FWSimVarMap aVarMap,
int aOrderNumber);

// Public Instance Methods

public HashMap createVariables(); // Defines
net.simplace.sim.model.FWSimComponent

// Protected Instance Methods

protected void init(); // Defines net.simplace.sim.model.FWSimComponent

protected void initVariables();

protected void process(); // Defines net.simplace.sim.model.FWSimComponent

protected FWSimComponent clone(FWSimVarMap aVarMap);
// Defines net.simplace.sim.model.FWSimComponent

}

Hierarchy: java.lang.Object - net.simplace.sim.model.FWSimComponent (net.simplace.sim.util.FWSimFieldContainer) - BelowgroundAllocationFactor