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113 | Werner | 2 | #include "global.h" |
3 | #include "production3pg.h" |
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4 | |||
189 | iland | 5 | #include "resourceunit.h" |
113 | Werner | 6 | #include "species.h" |
226 | werner | 7 | #include "speciesresponse.h" |
8 | #include "model.h" |
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113 | Werner | 9 | |
10 | Production3PG::Production3PG() |
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11 | { |
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226 | werner | 12 | mResponse=0; |
440 | werner | 13 | mEnvYear = 0.; |
113 | Werner | 14 | } |
15 | |||
226 | werner | 16 | /** |
17 | This is based on the utilizable photosynthetic active radiation. |
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18 | @sa http://iland.boku.ac.at/primary+production |
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227 | werner | 19 | The resulting radiation is MJ/m2 */ |
20 | inline double Production3PG::calculateUtilizablePAR(const int month) const |
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226 | werner | 21 | { |
327 | werner | 22 | // calculate the available radiation. This is done at SpeciesResponse-Level |
226 | werner | 23 | // see Equation (3) |
273 | werner | 24 | // multiplicative approach: responses are averaged one by one and multiplied on a monthly basis |
25 | // double response = mResponse->absorbedRadiation()[month] * |
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26 | // mResponse->vpdResponse()[month] * |
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27 | // mResponse->soilWaterResponse()[month] * |
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28 | // mResponse->tempResponse()[month]; |
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29 | // minimum approach: for each day the minimum aof vpd, temp, soilwater is calculated, then averaged for each month |
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327 | werner | 30 | //double response = mResponse->absorbedRadiation()[month] * |
31 | // mResponse->minimumResponses()[month]; |
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32 | double response = mResponse->utilizableRadiation()[month]; |
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273 | werner | 33 | |
226 | werner | 34 | return response; |
35 | } |
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36 | /** calculate the alphac (=photosynthetic efficiency) for the given month. |
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37 | this is based on a global efficiency, and modified per species. |
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227 | werner | 38 | epsilon is in gC/MJ Radiation |
226 | werner | 39 | */ |
227 | werner | 40 | inline double Production3PG::calculateEpsilon(const int month) const |
226 | werner | 41 | { |
42 | double epsilon = Model::settings().epsilon; // maximum radiation use efficiency |
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43 | epsilon *= mResponse->nitrogenResponse() * |
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300 | werner | 44 | mResponse->co2Response()[month]; |
226 | werner | 45 | return epsilon; |
46 | } |
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47 | |||
227 | werner | 48 | inline double Production3PG::abovegroundFraction() const |
49 | { |
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50 | double harsh = 1 - 0.8/(1 + 2.5 * mResponse->nitrogenResponse()); |
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51 | return harsh; |
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52 | } |
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53 | |||
369 | werner | 54 | void Production3PG::clear() |
55 | { |
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56 | for (int i=0;i<12;i++) { |
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57 | mGPP[i] = 0.; mUPAR[i]=0.; |
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58 | } |
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440 | werner | 59 | mEnvYear = 0.; |
369 | werner | 60 | } |
61 | |||
62 | /** calculate the GPP |
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226 | werner | 63 | @sa http://iland.boku.ac.at/primary+production */ |
115 | Werner | 64 | double Production3PG::calculate() |
113 | Werner | 65 | { |
226 | werner | 66 | Q_ASSERT(mResponse!=0); |
67 | // Radiation: sum over all days of each month with foliage |
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230 | werner | 68 | double year_raw_gpp = 0.; |
369 | werner | 69 | clear(); |
226 | werner | 70 | double utilizable_rad, epsilon; |
230 | werner | 71 | // conversion from gC to kg Biomass: C/Biomass=0.5 |
485 | werner | 72 | const double gC_to_kg_biomass = 1. / (biomassCFraction * 1000.); |
226 | werner | 73 | for (int i=0;i<12;i++) { |
230 | werner | 74 | utilizable_rad = calculateUtilizablePAR(i); // utilizable radiation of the month times ... |
226 | werner | 75 | epsilon = calculateEpsilon(i); // ... photosynthetic efficiency ... |
230 | werner | 76 | mUPAR[i] = utilizable_rad ; |
77 | mGPP[i] =utilizable_rad * epsilon * gC_to_kg_biomass; // ... results in GPP of the month kg Biomass/m2 (converted from gC/m2) |
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251 | werner | 78 | year_raw_gpp += mGPP[i]; // kg Biomass/m2 |
113 | Werner | 79 | } |
436 | werner | 80 | |
81 | // calculate f_env,yr: see http://iland.boku.ac.at/sapling+growth+and+competition |
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82 | double f_sum = 0.; |
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83 | for (int i=0;i<12;i++) |
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437 | werner | 84 | f_sum += mGPP[i] / gC_to_kg_biomass; // == uAPar * epsilon_eff |
436 | werner | 85 | |
467 | werner | 86 | // the factor f_ref: parameter that scales response values to the range 0..1 (1 for best growth conditions) (species parameter) |
87 | const double perf_factor = mResponse->species()->saplingGrowthParameters().referenceRatio; |
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485 | werner | 88 | // f_env,yr=(uapar*epsilon_eff) / (APAR * epsilon_0 * fref) |
436 | werner | 89 | mEnvYear = f_sum / (Model::settings().epsilon * mResponse->yearlyRadiation() * perf_factor); |
480 | werner | 90 | if (mEnvYear > 1.) { |
483 | werner | 91 | qDebug() << "ERROR: fEnvYear > 1 for " << mResponse->species()->id() << mEnvYear << "f_sum, epsilon, yearlyRad, perf_factor" << f_sum << Model::settings().epsilon << mResponse->yearlyRadiation() << perf_factor; |
485 | werner | 92 | mEnvYear = 1.; |
480 | werner | 93 | } |
436 | werner | 94 | |
95 | // calculate fraction for belowground biomass |
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227 | werner | 96 | mRootFraction = 1. - abovegroundFraction(); |
137 | Werner | 97 | |
98 | // global value set? |
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215 | werner | 99 | double dbg = GlobalSettings::instance()->settings().paramValue("gpp_per_year",0); |
227 | werner | 100 | if (dbg) { |
280 | werner | 101 | year_raw_gpp = dbg; |
227 | werner | 102 | mRootFraction = 0.4; |
103 | } |
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137 | Werner | 104 | |
230 | werner | 105 | // year GPP/rad: kg Biomass/m2 |
106 | mGPPperArea = year_raw_gpp; |
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107 | return mGPPperArea; // yearly GPP in kg Biomass/m2 |
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113 | Werner | 108 | } |