Bengtsson_1978_annual_volume_mortality_percent: Percentage of live standing volume lost to mortality per...

In Silviculturalist/forester: Forest Science and Forestry

Percentage of live standing volume lost to mortality per annum

Description

Natural mortality. Functions based on National Forest Inventory surveys of dead trees during 1973-1975. Dead or wind-felled trees above 5 cm diameter at breast height. Avoided harsh storm damages during 1969. Largest insecurity pertains to which season the substrate in question died.

A 'roof' was set at a maximum of 0.9

The mortality level during the observed period was judged to have been higher than normal so at application the mortality given by the functions was reduced with 40

Available Online (Swedish)

Usage

Bengtsson_1978_annual_volume_mortality_percent(
  QMD,
  age,
  MAI,
  northern_Sweden = TRUE,
  species = "Pinus sylvestris",
  reduce = TRUE,
  floor = 0.1,
  cieling = 0.9
)

Arguments

QMD	Diameter of mean basal area stem. Possibly arithmetic mean diameter.
age	stand age.
MAI	Mean Annual Increment max. e.g. [forester::Hagglund_1981_si_to_bonitet()],[forester::Jonson_1914_to_MAImax()]
northern_Sweden	Northern Sweden? North of c. 60 deg. lat?
species	One of 'Pinus sylvestris','Picea abies' or 'Betula pendula'.
reduce	Default=TRUE. Reduce due to rather high mortality during years of data collection? See details.
floor	Minimum annual mortality, in percent of live standing volume.
cieling	Maximum annual mortality, in percent of live standing volume.

Value

Annual mortality in percent of live standing volume.

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