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Density and competition indices

Stand density metrics, stocking ratios (Reineke SDI, Hart-Becking), and distance-dependent intra- and inter-specific competition indices (Hegyi, Voronoi).

Plot-level variables

  • Reineke_slope_value (REINEKE_VALUE) — decimal  •  dimensionless  •  output: r

    Reineke constant slope value (-1.605 as default).

    Reference: Reineke (1933). Perfection a stand-density index for even-aged forests. Journal of agricultural research. (Link)

  • Reineke_index (REINEKE) — decimal  •  dimensionless  •  output: SDI  •  multi-species: sp1, sp2

    Reineke Stand Density Index (SDI).

    Simulation breakdown: This variable is automatically expanded for each target stand species (Reineke_index_SP1, Reineke_index_SP2).

    Reference: Reineke (1933). Perfection a stand-density index for even-aged forests. Journal of agricultural research. (Link)

  • Reineke_index_max (REINEKE_MAX) — decimal  •  dimensionless  •  output: SDImax  •  multi-species: sp1, sp2

    Maximum allowable Reineke stand density index.

    Simulation breakdown: This variable is automatically expanded for each target stand species (Reineke_index_max_SP1, Reineke_index_max_SP2).

  • Reineke_index_mix (REINEKE_MIX) — decimal  •  dimensionless  •  output: SDI_mix

    Weighted Reineke stand density index for mixed stands.

  • Reineke_index_max_mix (REINEKE_MAX_MIX) — decimal  •  dimensionless  •  output: SDImax_mix

    Maximum Reineke stand density index for mixed stands.

  • Hart_index (HART) — decimal  •  %  •  output: S_hart

    Hart-Becking spacing index for regular square planting.

    Reference: Hart (1928). Stamtal en Dunning. Países Bajos.

  • Hart_index_staggered (HART_STAGGERED) — decimal  •  %  •  output: S_hart_staggered

    Hart-Becking spacing index for staggered planting.

    Reference: Hart (1928). Stamtal en Dunning. Países Bajos.

  • N_planting (PDEN) — decimal  •  trees/ha  •  output: N_planting

    Original planting density for site index correction (RAP_ORGANON model).

Tree-level variables

  • bal — decimal  •  m2/ha  •  output: bal

    Cumulative basal area of trees larger than the reference tree (BAL, Basal Area of Larger trees).

    Accepted inventory aliases: bal_larger, basal_area_larger

    Reference: Wykoff (1990). A Basal Area Increment Model for Individual Conifers in the Northern Rocky Mountains. Forest Science. (DOI:10.1093/FORESTSCIENCE/36.4.1077)

  • bal_intrasp — decimal  •  m2/ha  •  output: bal_intrasp

    Cumulative basal area of trees larger than the reference tree of the same species.

  • bal_intersp — decimal  •  m2/ha  •  output: bal_intersp

    Cumulative basal area of trees larger than the reference tree of different species.

  • bas — decimal  •  m2/ha  •  output: bas

    Cumulative basal area of trees smaller than the reference tree (BAS, Basal Area of Smaller trees).

    Accepted inventory aliases: basal_area_smaller

  • bas_intrasp — decimal  •  m2/ha  •  output: bas_intrasp

    Cumulative basal area of trees smaller than the reference tree of the same species.

  • bas_intersp — decimal  •  m2/ha  •  output: bas_intersp

    Cumulative basal area of trees smaller than the reference tree of different species.

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