Subversion Repositories public iLand

#ifndef SPECIES_H

#define SPECIES_H

#include "expression.h"

#include "speciesset.h"

class StampContainer; // forwards

class Stamp;

/// parameters for establishment

struct EstablishmentParameters

{

    double min_temp; //degC

    int chill_requirement; // days of chilling requirement

    int GDD_min, GDD_max; // GDD thresholds

    double GDD_baseTemperature; // for GDD-calc: GDD=sum(T - baseTemp)

    int bud_birst; // GDDs needed until bud burst

    int frost_free; // minimum number of annual frost-free days required

    double frost_tolerance; //factor in growing season frost tolerance calculation

    EstablishmentParameters(): min_temp(-37), chill_requirement(56), GDD_min(177), GDD_max(3261), GDD_baseTemperature(3.4),

                               bud_birst(255), frost_free(65), frost_tolerance(0.5) {}

};

/// parameters for sapling growth

struct SaplingGrowthParameters

{

    Expression heightGrowthPotential; ///< formula that expresses height growth potential

    int maxStressYears; ///< trees die, if they are "stressed" for this number of consectuive years

    double stressThreshold; ///< tree is considered as "stressed" if f_env_yr is below that threhold

    float hdSapling; ///< fixed height-diameter ratio used for saplings

    double ReinekesR; ///< Reinekes R, i.e. maximum stem number for a dg of 25cm

    double referenceRatio; ///< f_ref (eq. 3) -> ratio reference site / optimum site

    SaplingGrowthParameters(): maxStressYears(3), stressThreshold(0.1), hdSapling(80.f), ReinekesR(1450.), referenceRatio(1.) {}

    /// stem number that is represented by one cohort (N) (using Reinekes Law): Important: this is not scaled to N/ha!

    double representedStemNumber(const double dbh) const { return ReinekesR*pow(dbh/25., -1.605); }

};

class Species

{

public:

    Species(SpeciesSet *set) { mSet = set; mIndex=set->count(); mSeedDispersal=0; mRandomGenerator=0; }

    ~Species();

    // maintenance

    void setup();

    void newYear();

    // getter for a thread-local random number generator object. if setRandomGenerator() is used, this saves some overhead

    MTRand &randomGenerator() const { if (mRandomGenerator) return *mRandomGenerator; else return GlobalSettings::instance()->randomGenerator(); }

    void setRandomGenerator() { mRandomGenerator = &GlobalSettings::instance()->randomGenerator(); } // fetch random generator of the current thread

    const SpeciesSet *speciesSet() const { return mSet; }

    // properties

    SeedDispersal *seedDispersal() const { return mSeedDispersal; }

    /// @property id 4-character unique identification of the tree species

    const QString &id() const { return mId; }

    /// the full name (e.g. Picea Abies) of the species

    const QString &name() const { return mName; }

    const QColor displayColor() const { return mDisplayColor; }

    int index() const { return mIndex; } ///< unique index of species within current set

    bool active() const { return true; } ///< active??? todo!

    int phenologyClass() const { return mPhenologyClass; } ///< phenology class defined in project file. class 0 = evergreen

    bool isConiferous() const { return mConiferous; }

    bool isEvergreen() const { return mEvergreen; }

    bool isSeedYear() const { return mIsSeedYear; }

    // calculations: allometries

    double biomassFoliage(const double dbh) const;

    double biomassWoody(const double dbh) const;

    double biomassRoot(const double dbh) const;

    double biomassBranch(const double dbh) const;

    double allometricRatio_wf() const { return mWoody_b / mFoliage_b; }

    double allometricFractionStem(const double dbh) const;

    double finerootFoliageRatio() const { return mFinerootFoliageRatio; } ///< ratio of fineroot mass (kg) to foliage mass (kg)

    // turnover rates

    double turnoverLeaf() const { return mTurnoverLeaf; }

    double turnoverRoot() const { return mTurnoverRoot; }

    // hd-values

    void hdRange(const double dbh, double &rMinHD, double &rMaxHD) const;

    // growth

    double volumeFactor() const { return mVolumeFactor; } ///< factor for volume calculation: V = factor * D^2*H (incorporates density and the form of the bole)

    double density() const { return mWoodDensity; } ///< density of stem wood [kg/m3]

    double specificLeafArea() const { return mSpecificLeafArea; }

    // mortality

    double deathProb_intrinsic() const { return mDeathProb_intrinsic; }

    inline double deathProb_stress(const double &stress_index) const;

    // aging

    double aging(const float height, const int age) const;

    int estimateAge(const float height) const;///< estimate age for a tree with the current age

    // regeneration

    void seedProduction(const int age, const float height, const QPoint &position_index);

    void setSeedDispersal(SeedDispersal *seed_dispersal) {mSeedDispersal=seed_dispersal; }

    // environmental responses

    double vpdResponse(const double &vpd) const;

    inline double temperatureResponse(const double &delayed_temp) const;

    double nitrogenResponse(const double &availableNitrogen) const { return mSet->nitrogenResponse(availableNitrogen, mRespNitrogenClass); }

    double canopyConductance() const { return mMaxCanopyConductance; } ///< maximum canopy conductance in m/s

    inline double soilwaterResponse(const double &psi_kPa) const; ///< input: matrix potential (kPa) (e.g. -15)

    double lightResponse(const double lightResourceIndex) const {return mSet->lightResponse(lightResourceIndex, mLightResponseClass); }

    double psiMin() const { return mPsiMin; }

    // parameters for seed dispersal

    void treeMigKernel(double &ras1, double &ras2, double &ks) const { ras1=mTM_as1; ras2=mTM_as2; ks=mTM_ks; }

    double fecundity_m2() const { return mFecundity_m2; }

    double nonSeedYearFraction() const { return mNonSeedYearFraction; }

    const EstablishmentParameters &establishmentParameters() const { return mEstablishmentParams; }

    const SaplingGrowthParameters &saplingGrowthParameters() const { return mSaplingGrowthParams; }

    const Stamp* stamp(const float dbh, const float height) const { return mLIPs.stamp(dbh, height);}

private:

    Q_DISABLE_COPY(Species);

    // helpers during setup

    bool boolVar(const QString s) { return mSet->var(s).toBool(); } ///< during setup: get value of variable @p s as a boolean variable.

    double doubleVar(const QString s) { return mSet->var(s).toDouble(); }///< during setup: get value of variable @p s as a double.

    int intVar(const QString s) { return mSet->var(s).toInt(); } ///< during setup: get value of variable @p s as an integer.

    QString stringVar(const QString s) { return mSet->var(s).toString(); } ///< during setup: get value of variable @p s as a string.

    MTRand *mRandomGenerator;

    SpeciesSet *mSet; ///< ptr. to the "parent" set

    StampContainer mLIPs; ///< ptr to the container of the LIP-pattern

    QString mId;

    QString mName;

    QColor mDisplayColor;

    int mIndex; ///< internal index within the SpeciesSet

    bool mConiferous; ///< true if confierous species (vs. broadleaved)

    bool mEvergreen; ///< true if evergreen species

    // biomass allometries:

    double mFoliage_a, mFoliage_b;  ///< allometry (biomass = a * dbh^b) for foliage

    double mWoody_a, mWoody_b; ///< allometry (biomass = a * dbh^b) for woody compartments aboveground

    double mRoot_a, mRoot_b; ///< allometry (biomass = a * dbh^b) for roots (compound, fine and coarse roots as one pool)

    double mBranch_a, mBranch_b; ///< allometry (biomass = a * dbh^b) for branches

    double mSpecificLeafArea; ///< conversion factor from kg OTS to m2 LeafArea

    // turnover rates

    double mTurnoverLeaf; ///< yearly turnover rate leafs

    double mTurnoverRoot; ///< yearly turnover rate root

    double mFinerootFoliageRatio; ///< ratio of fineroot mass (kg) to foliage mass (kg)

    // height-diameter-relationships

    Expression mHDlow; ///< minimum HD-relation as f(d) (open grown tree)

    Expression mHDhigh; ///< maximum HD-relation as f(d)

    // stem density and taper

    double mWoodDensity; ///< density of the wood [kg/m3]

    double mFormFactor; ///< taper form factor of the stem [-] used for volume / stem-mass calculation calculation

    double mVolumeFactor; ///< factor for volume calculation

    // mortality

    double mDeathProb_intrinsic;  ///< prob. of intrinsic death per year [0..1]

    double mDeathProb_stress; ///< max. prob. of death per year when tree suffering maximum stress

    // Aging

    double mMaximumAge; ///< maximum age of species (years)

    double mMaximumHeight; ///< maximum height of species (m) for aging

    Expression mAging;

    // environmental responses

    double mRespVpdExponent; ///< exponent in vpd response calculation (Mäkela 2008)

    double mRespTempMin; ///< temperature response calculation offset

    double mRespTempMax; ///< temperature response calculation: saturation point for temp. response

    double mRespNitrogenClass; ///< nitrogen response class (1..3). fractional values (e.g. 1.2) are interpolated.

    double mPsiMin; ///< minimum water potential (MPa), i.e. wilting point (is below zero!)

    // water

    double mMaxCanopyConductance; ///< maximum canopy conductance for transpiration (m/s)

    int mPhenologyClass;

    double mLightResponseClass; ///< light response class (1..5) (1=shade intolerant)

    // regeneration

    SeedDispersal *mSeedDispersal; ///< link to the seed dispersal map of the species

    int mMaturityYears; ///< a tree produces seeds if it is older than this parameter

    double mSeedYearProbability; ///< probability that a year is a seed year (=1/avg.timespan between seedyears)

    bool mIsSeedYear; ///< true, if current year is a seed year. see also:

    double mNonSeedYearFraction;  ///< fraction of the seed production in non-seed-years

    // regeneration - seed dispersal

    double mFecundity_m2; ///< "surviving seeds" (cf. Moles et al) per m2, see also http://iland.boku.ac.at/fecundity

    double mTM_as1; ///< seed dispersal paramaters (treemig)

    double mTM_as2; ///< seed dispersal paramaters (treemig)

    double mTM_ks; ///< seed dispersal paramaters (treemig)

    EstablishmentParameters mEstablishmentParams; ///< collection of parameters used for establishment

    SaplingGrowthParameters mSaplingGrowthParams; ///< collection of parameters for sapling growth

};

// inlined functions...

inline void Species::hdRange(const double dbh, double &rLowHD, double &rHighHD) const

{

    rLowHD = mHDlow.calculate(dbh);

    rHighHD = mHDhigh.calculate(dbh);

}

/** vpdResponse calculates response on vpd.

    Input: vpd [kPa]*/

inline double Species::vpdResponse(const double &vpd) const

{

    return exp(mRespVpdExponent * vpd);

}

/** temperatureResponse calculates response on delayed daily temperature.

    Input: average temperature [°C]

    Note: slightly different from Mäkela 2008: the maximum parameter (Sk) in iLand is interpreted as the absolute

          temperature yielding a response of 1; in Mäkela 2008, Sk is the width of the range (relative to the lower threhold)

*/

inline double Species::temperatureResponse(const double &delayed_temp) const

{

    double x = qMax(delayed_temp-mRespTempMin, 0.);

    x = qMin(x/(mRespTempMax-mRespTempMin), 1.);

    return x;

}

/** soilwaterResponse is a function of the current matrix potential of the soil.

  */

inline double Species::soilwaterResponse(const double &psi_kPa) const

{

    const double psi_mpa = psi_kPa / 1000.; // convert to MPa

    double result = limit( 1. - psi_mpa / mPsiMin, 0., 1.);

    return result;

}

/** calculate probabilty of death based on the current stress index. */

inline double Species::deathProb_stress(const double &stress_index) const

{

    if (stress_index==0)

        return 0.;

    double result = 1. - exp(-mDeathProb_stress*stress_index);

    return result;

}

#endif // SPECIES_H