lmfor (version 1.6)

afterthin: Increment core data of Scots pine trees

Description

Post-thinning growth ring measurements of 88 trees of a long-term thinning experiment on a naturally regenerated Scots pine stand in Eastern Finland.

Usage

data(afterthin)

Format

A data frame with 1319 observations on the following 7 variables.

Plot

Sample plot id, a factor with 10 levels.

Tree

Tree id, a factor with 55 levels (same tree id may occur on different plots!).

Year

Calendar year of the ring.

SDAfterThin

Stand density (trees per ha) of the sample plot.

SDClass

Thinning treatment, factor with 4 levels (1=Control, 2=Light, 3=Moderate, 4=Heavy).

CA

Current tree age in years.

RBA

Ring Basal area, \(mm^2\)

Details

Long-term thinning experiment on a naturally regenerated Scots pine stand in Eastern Finland. The experiment consists of 10 sample plots, in four different classes according to the post-thinning stand density. The plots were thinned in winter 1986-1987. In winter 2006 -2007, 10 trees were felled from each plot. A radial 5mm by 5mm segment from pith to bark was cut from each tree at height 1.3 meter height. Ring widths from pith to bark were analyzed for each sample, using an ITRAX X-ray microdensitometer an post-processed to create ring widths from pith to bark were determined for each disc. The ring widths were further transformed to ring basal areas by assuming circular, growth rings. For 12 trees, ring widths could not be extracted. The data includes ring widths for a total of 88 trees between years 1991-2005. The original data is available in data set patti.

References

Mehtatalo, L., Peltola, H., Kilpelainen, A. and Ikonen, V.-P. 2014. The response of basal area growth of Scots pine to thinning: A longitudinal analysis of tree-specific series using a nonlinear mixed-effects model. Forest Science 60 (4): pp. 636-644. DOI: 10.5849/forsci.13-059.

Mehtatalo, Lauri and Lappi, Juha 2020. Biometry for Forestry and Environmental Data: with examples in R. New York: Chapman and Hall/CRC. 426 p. 10.1201/9780429173462

See Also

patti, thefdata, thinning.

Examples

# NOT RUN {
data(afterthin)
par(mfcol=c(2,1),cex=0.7,mai=c(0.8,0.8,0.5,0.1))
linesplot(afterthin$CA,
		  afterthin$RBA,
		  group=afterthin$Plot:afterthin$Tree,
		  col.lin=as.numeric(afterthin$SDClass),cex=0,
		  xlab="Tree age",
		  ylab=expression("Ring basal area, "*mm^2))
		  
linesplot(afterthin$Year,
		  afterthin$RBA,
		  group=afterthin$Plot:afterthin$Tree,
		  col.lin=as.numeric(afterthin$SDClass),cex=0,
		  xlab="Year",
		  ylab=expression("Ring basal area, "*mm^2))
# }