Hossfeld: Creates a Hossfeld function defining growth.

In IPMpack: Builds and analyses Integral Projection Models (IPMs).

Description

Functional form describing growth according to a Hossfeld function.

Usage

Hossfeld(size, par)

Arguments

size	vector of sizes.
par	vector of length 3.

Author(s)

C. Jessica E. Metcalf, Sean M. McMahon, Roberto Salguero-Gomez, Eelke Jongejans & Cory Merow.

References

Zuidema, Jongejans, Chien, During & Schieving. 2010. Integral projection models for trees: a new parameterization method and a validation of model output. Journal of Ecology 98, p345-355.

Rivas, Gonzalez, Gonzalez & von Gadow. 2004. Compatible height and site index models for five pine species in El Salto, Durango (Mexico). Forest Ecology and Management 201, p145-160.

Examples

dff <- generateData()
sizeRange <- c(1:20)
sizeInit <- 1
Hossfeld(sizeRange, rep(1, 3))
plot(Hossfeld(1:10, rep(1, 3)), type = "l", 
    ylab = "Predicted increment from t to t+1", 
	xlab = "Continuous (size) stage in time t", col = "dark gray")

Example output

Loading required package: Matrix
Loading required package: MASS
Loading required package: nlme
 [1] 0.250000000 0.111111111 0.062500000 0.040000000 0.027777778 0.020408163
 [7] 0.015625000 0.012345679 0.010000000 0.008264463 0.006944444 0.005917160
[13] 0.005102041 0.004444444 0.003906250 0.003460208 0.003086420 0.002770083
[19] 0.002500000 0.002267574

IPMpack documentation built on May 2, 2019, 2:36 a.m.