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net.simplace.sim.components.crop.heatstress.HeatStressOnGrain

HeatStressOnGrain calculates the heat stress factor (HeatStressFactor) around anthesis (approx. 30 days around anthesis) based on the daily heat stress intensity. The day which day temperature is above certain threshold TempCritical (e.g. 27 °C for winter wheat) count as heated day. The highest daily heat stress intensity occur whenever day temperature is above limited temperature TempLimit (e.g. 40 °C for winter wheat). All equations documented in (T).

The critical and limit temperatures can be customized, as well as the number of days before and after anthesis, when stress should be taken into account.

Instead of providing the number of days, one can give the devstages when the heat stress period starts and ends. The number of days are then calculated from phenology.

Daily inputs are: min and max temperatures, dev stage, temperature sum, anthesis date and yield.

Daily stress factor

\( \begin{eqnarray} TDay_i & = & Tmax_i - \frac{Tmax_i-Tmin_i}{4} \\ DailyStressFactor_i & = & \max(0,\min(1,\frac{TDay_i - TempCritical}{TempLimit-TempCritical})) \\ \end{eqnarray} \)

Heat stress factor

\( \begin{eqnarray} CummulatedHeatStressFactor & = & \sum_{i=AnthesisDOY - DaysBeforeAnthesis}^{AnthesisDoy + DaysFromAnthesis} DailyStressFactor_i \\ HeatStressFactor & = & \frac{CummulatedHeatStressFactor}{DaysBeforeAnthesis + DaysFromAnthesis+1} \\ \end{eqnarray} \)

Adjusted yield

\( \begin{eqnarray} AdjustedYield & = & (1-HeatStressFactor) \cdot Yield \\ \end{eqnarray} \)

References:

(T) Teixeira, E., Fischer, G., Velthuizen, H., Walter, C., Ewert, F. 2013. Global hot-spots of heat stress on agricultural crops due to climate change. Agriculture and Forest meteorology, 170:206-2015.

Component Variables

Content Type	Name	Description	Data Type	Unit	Min Value	Max Value	Default Value
constant	cBeginDevStage	Development stage before anthesis which thermal sensitive period start	DOUBLE	1	-	-	0.8
constant	cDaysBeforeAnthesis	Thermal sensitive days before anthesis	INT	1	-	-	0
constant	cDaysFromAnthesis	Thermal sensitive days after anthesis	INT	1	-	-	0
constant	cEndDevStage	Development stage before anthesis which thermal sensitive period end	DOUBLE	1	-	-	1.3
constant	cTempCritical	Critical temperature threshold to start of heat stress	DOUBLE	°C	-	-	27.0
constant	cTempLimit	The temperature which maximum heat stress occurs	DOUBLE	°C	-	-	40.0
input	iAnthesisDate	Anthesis date	DATE	1	-	-	-
input	iDevStage	Development stage	DOUBLE	1	-	-	0.0
input	iTMax	Daily maximum temperature	DOUBLE	°C	-	-	0.0
input	iTMin	Daily minimum temperature	DOUBLE	°C	-	-	0.0
input	iTempSum	Temperature sum	DOUBLE	°C d	-	-	0.0
input	iYield	Simulated yield before heat stress adjustment	DOUBLE	g/m2	-	-	0.0
state	sAffectedDays	Days which heat stress occurs	INT	1	-	-	0
state	sCumulatedHeatStressFactor	Cumulative heat stress factor	DOUBLE	1	-	-	0.0
state	sDays	Number of days related to thermal sensitive period	INT	1	-	-	0
state	sTDay	Day time temperature	DOUBLE	°C	-	-	0.0
rate	rDailyHeatStressFactor	Daily heat stress factor	DOUBLE	1	-	-	0.0
out	AdjustedYield	Adjusted yield by heat stress	DOUBLE	g/m2	-	-	0.0
out	BeginDOY	Begin of thermal sensitive period (day of year format)	INT	1	-	-	0
out	BeginDevStage	Begin of thermal sensitive period (Development stage format)	DOUBLE	1	-	-	0.0
out	BeginTempSum	Begin of thermal sensitive period (temperature sum format)	DOUBLE	°C d	-	-	0.0
out	EndDOY	End of thermal sensitive period (day of year format)	INT	1	-	-	0
out	EndDevStage	End of thermal sensitive period (Development stage format)	DOUBLE	1	-	-	0.0
out	EndTempSum	End of thermal sensitive period (temperature sum format)	DOUBLE	°C d	-	-	0.0
out	HeatStressFactor	Heat stress factor	DOUBLE	1	-	-	0.0

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

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

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

creates a clone from this SimComponent for use in other threads

}

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