/// <summary>
 /// Adds biomass for a species to the woody debris pool at a site.
 /// </summary>
 public static void AddWoodyDebris(double woodBiomass,
                                   ISpecies species,
                                   PoolD woodyDebris)
 {
     woodyDebris.AddMass(woodBiomass, SpeciesData.WoodFractionC[species],
         SpeciesData.WoodFractionN[species], SpeciesData.WoodFractionP[species],
         SpeciesData.WoodyDebrisDecay[species]);
 }