ElfvingIBM: Basal Area Increment function for Aspen

In Silviculturalist/forester: Forest Science and Forestry

Basal Area Increment function for Aspen

Description

Based on data from permanent plots at the National Forest Inventory.

Usage

Elfving_2004_BA_increment_Aspen(
  diameter_cm,
  Basal_area_weighted_mean_diameter_cm,
  distance_to_coast_km,
  BA_sum_of_trees_with_larger_diameter,
  BA_Aspen,
  Basal_area_plot,
  Basal_area_stand,
  computed_tree_age,
  latitude,
  altitude,
  vegetation,
  uneven_aged,
  fertilised = 0,
  thinned,
  last_thinned
)

Elfving_2004_BA_increment_Beech(
  diameter_cm,
  Basal_area_weighted_mean_diameter_cm,
  distance_to_coast_km,
  BA_sum_of_trees_with_larger_diameter,
  BA_Beech,
  Basal_area_plot,
  Basal_area_stand,
  computed_tree_age,
  latitude,
  altitude,
  vegetation,
  SIS,
  divided_plot = 0,
  edge_effect,
  uneven_aged,
  fertilised = 0,
  thinned,
  last_thinned
)

Elfving_2004_BA_increment_Birch(
  diameter_cm,
  Basal_area_weighted_mean_diameter_cm,
  distance_to_coast_km,
  BA_sum_of_trees_with_larger_diameter,
  BA_Birch,
  Basal_area_plot,
  Basal_area_stand,
  computed_tree_age,
  latitude,
  altitude,
  vegetation,
  edge_effect,
  uneven_aged,
  fertilised = 0,
  thinned,
  last_thinned
)

Elfving_2004_BA_increment_Noble(
  diameter_cm,
  BA_sum_of_trees_with_larger_diameter,
  Basal_area_plot,
  Basal_area_stand,
  altitude,
  gotland = FALSE,
  vegetation,
  thinned,
  last_thinned
)

Elfving_2004_BA_increment_Oak(
  diameter_cm,
  BA_sum_of_trees_with_larger_diameter,
  BA_Oak,
  Basal_area_plot,
  Basal_area_stand,
  altitude,
  gotland = FALSE,
  vegetation,
  thinned,
  last_thinned,
  edge_effect
)

Elfving_2004_BA_increment_Pine(
  diameter_cm,
  Basal_area_weighted_mean_diameter_cm,
  BA_sum_of_trees_with_larger_diameter,
  BA_Spruce,
  BA_Pine,
  Basal_area_plot,
  Basal_area_stand,
  computed_tree_age,
  latitude,
  gotland = FALSE,
  altitude,
  SIS,
  vegetation,
  divided_plot = 0,
  edge_effect,
  uneven_aged,
  fertilised = 0,
  thinned,
  last_thinned
)

Elfving_2004_BA_increment_Spruce(
  diameter_cm,
  Basal_area_weighted_mean_diameter_cm,
  SS_diam,
  stems,
  BA_sum_of_trees_with_larger_diameter,
  BA_Spruce,
  BA_Pine,
  Basal_area_plot,
  Basal_area_stand,
  computed_tree_age,
  latitude,
  gotland = FALSE,
  altitude,
  SIS,
  vegetation,
  divided_plot = 0,
  edge_effect,
  uneven_aged,
  fertilised = 0,
  thinned,
  last_thinned
)

Elfving_2004_BA_increment_Trivial(
  diameter_cm,
  BA_sum_of_trees_with_larger_diameter,
  Basal_area_plot,
  computed_tree_age,
  vegetation,
  SIS,
  uneven_aged,
  thinned,
  last_thinned
)

Arguments

diameter_cm	Diameter of the tree at breast height, 1.3 m
Basal_area_weighted_mean_diameter_cm	Basal area weighted mean diameter of the trees on the plot, cm. (\sum{diameter_cm^3} / \sum{diameter_cm^2})
distance_to_coast_km	Distance in kilometres to the nearest Swedish coast, e.g. [forester::coast_distance()]
BA_sum_of_trees_with_larger_diameter	Basal area sum of trees on the plot with larger diameters than that of the target tree.
BA_Aspen	Basal area Aspen on the plot. m2/ha.
Basal_area_plot	Basal area on the plot, m2/ha.
Basal_area_stand	Basal area in the surrounding stand, m2/ha.
computed_tree_age	Age at breast height computed by [forester::Elfving_2003_single_tree_age_estimation()]
latitude	Latitude, decimal degrees.
altitude	Altitude, meters above sea level.
vegetation	Vegetation type according to follows Swedish National forest inventory FALTSKIKT: Code Vegetation 1 Rich-herb without shrubs 2 Rich-herb with shrubs/bilberry 3 Rich-herb with shrubs/lingonberry 4 Low-herb without shrubs 5 Low-herb with shrubs/bilberry 6 Low-herb with shrubs/lingonberry 7 No field layer 8 Broadleaved grass 9 Thinleaved grass 10 Sedge, high 11 Sedge, low 12 Horsetail, Equisetum ssp. 13 Bilberry 14 Lingonberry 15 Crowberry 16 Poor shrub 17 Lichen, frequent occurrence 18 Lichen, dominating
uneven_aged	1 if less than 80% of the main stand volume is within a 20-year age-span.
fertilised	1 if the plot has been fertilised, otherwise 0 (default).
thinned	1 if the plot has been thinned, otherwise 0.
last_thinned	Number of growth seasons since the stand was last thinned.
BA_Beech	Basal area Beech on the plot. m2/ha.
SIS	Site Index predicted from Stand factors [forester::Hagglund_Lundmark_1979_Site_Index_Prediction()]
divided_plot	1 if plot has been divided, otherwise 0. Always 0 for prediction.
edge_effect	1 if plot has been divided towards open land, otherwise 0. Both divided_plot and edge_effect cannot be 1 at the same time. Always 0 for prediction.
BA_Birch	Basal area Birch on the plot. m2/ha.
gotland	1 if plot is on the island of Gotland, otherwise 0.
BA_Oak	Basal area Oak on the plot. m2/ha.
BA_Spruce	Basal area Norway Spruce on the plot. m2/ha.
BA_Pine	Basal area Scots Pine on the plot. m2/ha.
SS_diam	Sum of Squared Diameters, cm.
stems	Number of stems per hectare.

Details

Elfving Basal Area Increment functions for Individual Trees from NFI data.

R^2 = 0.723

R^2 = 0.722

R^2 = 0.555

R^2 = 0.639. The noble tree species are Ash Fraxinus excelsior, Elm Ulmus glabra, Linden Tilia cordata , Maple Acer platanoides, Hornbeam Carpinus betulus and Wild Cherry Prunus avium.

R^2 = 0.729

R^2 = 0.758

R^2 = 0.753

R^2 = 0.569. The trivial tree species include mostly: Alder Alnus, Rowan Sorbus aucuparia and Willow Salix spp.

Value

The 5 - year increase of Basal Area (m^2)

Source

[Elfving, B. (2010) Translated, re-formulated Pro-Memoria for HEUREKA based on Manuscript 2004-01-26. 'Individual-tree basal area growth functions for all Swedish forests'.](https://www.heurekaslu.se/w/images/9/93/Heureka_prognossystem_\

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