Lexerod_2005_count: Number of recruits to smallest diameter class (5 cm) for a 5...

In Silviculturalist/forester: Forest Science and Forestry

Number of recruits to smallest diameter class (5 cm) for a 5 year period in young norwegian stands.

Description

Calculates the number of recruits into >5 cm diameter breast height class) occuring during a 5 years period. These functions are suitable for development class II (Conifers and broadleaves: max total stand ages 20, 20, 25, 30, 35, 45, 55 for SI40 23, 20, 17, 14, 11, 8, 6; Birch: max total stand ages 15, 15, 20, 25, 25, 25, 30 years for SI40 23, 20, 17, 14, 11, 8, 6).

Usage

Lexerod_2005_recruitment_count_5cm_Norway_Norway_Spruce(
  SI40,
  age,
  stems_ha,
  percent_spruce
)

Lexerod_2005_recruitment_count_5cm_Norway_Scots_Pine(
  SI40,
  age,
  stems_ha,
  percent_pine
)

Lexerod_2005_recruitment_count_5cm_Norway_Birch(
  age,
  stems_ha,
  percent_birch_broadleaves
)

Lexerod_2005_recruitment_count_5cm_Norway_Broadleaves(
  altitude,
  latitude,
  SI40,
  age,
  stems_ha,
  percent_birch_broadleaves
)

Arguments

SI40	Site Index at base-age 40 for species in question. For Broadleaves , use SI40 Birch (?). e.g. [forester::Tveite_1976_height_trajectory_Norway_Pine()], [forester::Tveite_1977_height_trajectory_Norway_Norway_Spruce()], Strand (1967).
age	Stand age, breast height (1.3m)
stems_ha	Stems per hectare.
percent_spruce	Percent (Basal area? Stems?) of Spruce.
percent_pine	Percent (Basal area? Stems?) of Scots Pine.
percent_birch_broadleaves	Sum of Percent of of birch and other broadleaves. (stems)
altitude	meters above sea level.
latitude	Degrees N.

Details

Norway spruce observations: 510. Adj.R^2 = 0.396. CV(percent): 13.8.

Scots Pine observations: 228. Adj.R^2 = 0.297. CV(percent): 16.0.

Birch observations: 436. Adj.R^2 = 0.147. CV(percent): 18.2.

Broadleaf observations: 166. Adj.R^2 = 0.159. CV(percent): 18.4.

Value

Number of recruits

Source

Lexerød, N., Eid, T. (2005) Recruitment models for Norway Spruce, Scots Pine, Birch and Other Broadleaves in Young Growth Forests in Norway. Silva Fenn. 39(3): 391-406. Available (2022-02-26): https://www.silvafennica.fi/pdf/article376.pdf

Silviculturalist/forester documentation built on April 20, 2024, 2:13 p.m.