calc.max.sdi {rconifers}R Documentation

Calculate the maximum stand density index using the CONIFERS forest growth model

Description

Returns the maximum stand density index, given the current species mapping and variant.

Usage

calc.max.sdi( x )

Arguments

x a sample.data object.

Details

The calc.max.sdi function returns a numeric value that represents the maximum stand density index limit for the input plants/plots data. The value is used to compute the $x_0$ element in the sample.data object, which is then used to control competition induced mortality.

Author(s)

Jeff D. Hamann jeff.hamann@forestinformatics.com,
Martin W. Ritchie mritchie@fs.fed.us

References

Hann, D.W. and C.H. Wang. 1990. Mortality equations for individual trees in southwest Oregon. Oregon State University, Forest Research Laboratory, Corvallis, Oregon. Research Bulletin 67. 17p.

Ritchie, M. and J. Hamann. 2006. Modeling dynamics of competing vegetation in young conifer plantations of northern California and southern Oregon, USA. Canadian Journal of Forest Research 36(10): 2523-2532.

Ritchie, M. and J. Hamann. 2008. Individual-tree height-, diameter- and crown-width increment equations for young Douglas-fir plantations. New Forests 35(2):173-186.

Ritchie, M.W. 2008. User's Guide and Help System for CONIFERS: A Simulator for Young Conifer Plantations Version 4.10. See http://www.fs.fed.us/psw/programs/ecology_of_western_forests/projects/conifers/

Vaughn, Nicholas. 2007. An individual-tree model to predict the annual growth of young stands of Douglas-fir (Pseudotsuga menziesii (Mirbel) Franco) in the Pacific northwest. M.S. Thesis, University of Washington. 91p.

See Also

calc.max.sdi, impute, project, rand.seed, rconifers, sample.data, set.species.map, set.variant, smc, summary.sample.data, swo, thin

Examples

library( rconifers )

## set the variant to the SWO variant

set.species.map( set.variant(0) )

# load and display CONIFERS swo example plots
data( plots.swo )
print( plots.swo )

# load and display CONIFERS example plants
data( plants.swo )
print( plants.swo )

# create the sample.data list object
sample.swo <- list( plots=plots.swo, plants=plants.swo, age=3, x0=0.0 )
class(sample.swo)  <- "sample.data"

# print the maximum stand density index for the current settings
print( calc.max.sdi( sample.swo ) )


[Package rconifers version 1.0.0 Index]