getWoodDensity {BIOMASS}

Estimating wood density

Description

The function estimates the wood density (WD) of the trees from their taxonomy or from their congeners using the global wood density database (Chave et al. 2009, Zanne et al. 2009) or any additional dataset. The WD can either be attributed to an individual at a species, genus, family or stand level.

Usage

getWoodDensity(
  genus,
  species,
  stand = NULL,
  family = NULL,
  region = "World",
  addWoodDensityData = NULL,
  verbose = TRUE
)

Arguments

genus

Vector of genus names

species

Vector of species names

stand

(optional) Vector with the corresponding stands of your data. If set, the missing wood densities at the genus level will be attributed at stand level. If not, the value attributed will be the mean of the whole tree dataset.

family

(optional) Vector of families. If set, the missing wood densities at the genus level will be attributed at family level if available.

region

Region (or vector of region) of interest of your sample. By default, Region is set to 'World', but you can restrict the WD estimates to a single region :

• AfricaExtraTrop: Africa (extra tropical)

• AfricaTrop: Africa (tropical)

• Australia: Australia

• AustraliaTrop: Australia (tropical)

• CentralAmericaTrop: Central America (tropical)

• China: China

• Europe: Europe

• India: India

• Madagascar: Madagascar

• Mexico: Mexico

• NorthAmerica: North America

• Oceania: Oceania

• SouthEastAsia: South-East Asia

• SouthEastAsiaTrop: South-East Asia (tropical)

• SouthAmericaExtraTrop: South America (extra tropical)

• SouthAmericaTrop: South America (tropical)

• World: World

addWoodDensityData

A dataframe containing additional wood density data to be combined with the global wood density database. The dataframe should be organized in a dataframe with three (or four) columns: "genus","species","wd", the fourth column "family" is optional.

verbose

A logical, give some statistic with the database

Details

The function assigns to each taxon a species- or genus- level average if at least one wood density value at the genus level is available for that taxon in the reference database. If not, the mean wood density of the family (if set) or of the stand (if set) is given.

The function also provides an estimate of the error associated with the wood density estimate (i.e. a standard deviation): a mean standard deviation value is given to the tree at the appropriate taxonomic level using the sd_10 dataset.

Value

Returns a dataframe containing the following information:

• family: (if set) Family

• genus: Genus

• species: Species

• meanWD (g/cm^3): Mean wood density

• sdWD (g/cm^3): Standard deviation of the wood density that can be used in error propagation (see sd_10 and AGBmonteCarlo())

• levelWD: Level at which wood density has been calculated. Can be species, genus, family, dataset (mean of the entire dataset) or, if stand is set, the name of the stand (mean of the current stand)

• nInd: Number of individuals taken into account to compute the mean wood density

Author(s)

Maxime REJOU-MECHAIN, Arthur PERE, Ariane TANGUY

References

Chave, J., et al. Towards a worldwide wood economics spectrum. Ecology letters 12.4 (2009): 351-366. Zanne, A. E., et al. Global wood density database. Dryad. Identifier: http://hdl. handle. net/10255/dryad 235 (2009).

See Also

wdData, sd_10

Examples

# Load a data set
data(KarnatakaForest)

# Compute the Wood Density up to the genus level and give the mean wood density of the dataset

WD <- getWoodDensity(
  genus = KarnatakaForest$genus,
  species = KarnatakaForest$species
)


# Compute the Wood Density up to the genus level and then give the mean wood density per stand

WD <- getWoodDensity(
  genus = KarnatakaForest$genus,
  species = KarnatakaForest$species,
  stand = KarnatakaForest$plotId
)


# Compute the Wood Density up to the family level and then give the mean wood density per stand

WD <- getWoodDensity(
  family = KarnatakaForest$family,
  genus = KarnatakaForest$genus,
  species = KarnatakaForest$species,
  stand = KarnatakaForest$plotId
)
str(WD)