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    Expression heightGrowthPotential; ///< formula that expresses height growth potential
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    Expression heightGrowthPotential; ///< formula that expresses height growth potential
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    int maxStressYears; ///< trees die, if they are "stressed" for this number of consectuive years
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    int maxStressYears; ///< trees die, if they are "stressed" for this number of consectuive years
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    double stressThreshold; ///< tree is considered as "stressed" if f_env_yr is below that threhold
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    double stressThreshold; ///< tree is considered as "stressed" if f_env_yr is below that threhold
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    float hdSapling; ///< fixed height-diameter ratio used for saplings
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    float hdSapling; ///< fixed height-diameter ratio used for saplings
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    double ReineckesR; ///< Reineckes R, i.e. maximum stem number for a dg of 25cm
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    double ReineckesR; ///< Reineckes R, i.e. maximum stem number for a dg of 25cm
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    SaplingGrowthParameters(): maxStressYears(3), stressThreshold(0.1), hdSapling(80.f), ReineckesR(1450.) {}
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    double referenceRatio; ///< f_ref (eq. 3) -> ratio reference site / optimum site
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    SaplingGrowthParameters(): maxStressYears(3), stressThreshold(0.1), hdSapling(80.f), ReineckesR(1450.), referenceRatio(1.) {}
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};
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};
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class Species


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class Species


          

          

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{


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{