dmd.htfunc: Density management height functions

In mwritchie/standview: R Package for Stand Density Management Diagrams

Density management height functions

Description

This suite of functions estimates height for forest stands as a function of trees per acre and quadratic mean diameter. Since the dmd.volume function calls these functions, it is not necessary that user's access these directly. These functions are parameterized for English unit input and output. User is responsible for metric conversions.

Usage

jrzheight(tpa, qmd)
ls2012height(tpa, qmd)
McC1986height(tpa, qmd)
Wl1994height(qmd, mV)

Arguments

tpa	Trees per acre.
qmd	Stand quadratic mean diameter (inches).
mV	Mean tree volume (cubic feet).

Value

Returns dominant height (feet) for Jang et al. (2021), Long and Shaw (2012), McCarter and Long (1986), or Williams (1994).

Author(s)

Martin W. Ritchie, Research Forester, US Forest Service, Pacific Southwest Research Station. Email: [e-mail]

References

Jang, W.S., M.W. Ritchie and J. Zhang (2021) Improved equations for the density management diagram isolines of ponderosa pine stands. For. Sci. 67(1):93-102

Long, J.N. and Shaw, J.D. (2005) A density management diagram for even-aged ponderosa pine stands. West. J. Appl. For. 20(4):205-215.

Long, J.N. and Shaw, J.D. (2012) A density management diagram for even-aged Sierra Nevada mixed-conifer Stands. West. J. Appl. For. 27(4):187-195.

McCarter, J.B. and J.N. Long (1986) A lodgepole pine density management diagram. West. J. Appl. For. 1(1)6-11.

Reineke, L.H. (1933) Perfecting a stand density index for even-aged forests. J. Ag. Res. 46:627-638.

Williams, R.A. (1994) Stand density management diagram for loblolly pine plantations in north Louisiana. South. J. Appl. For. 18(1):40-45.

Examples

jrzheight(tpa=200, qmd=10.2)
ls2012height(tpa=200, qmd=10.2)
McC1986height(tpa=200, qmd=10.2)
Wl1994height(qmd=14, mV=40)

mwritchie/standview documentation built on June 29, 2024, 11:56 a.m.