spataustria {biometrics} | R Documentation |
Tree locations within sample plots in an experimental forest in Austria
Description
The Austrian Research Center for Forests established a spacing experiment with Norway spruce (Picea abies) in the Vienna Woods. In the 'Hauersteig' experiment, several tree-level variables were measured within four sample plots over time. The current dataframe has only the measurements carried out in 1944.
Usage
data(spataustria)
Format
Contains cartesian position of trees, and covariates, in sample plots, as follows:
- plot
Plot number.
- tree
Tree number.
- species
Species code as follows: PCAB=Picea abies, LADC=Larix decidua, PNSY=Pinus sylvestris, FASY=Fagus Sylvatica, QCPE=Quercus petraea, BTPE=Betula pendula.
- x.coord
Cartesian position in the X-axis, in m.
- y.coord
Cartesian position in the Y-axis, in m.
- year
Measurement year.
- dbh
diameter at breast-height, in cm.
Source
Data were retrieved from the paper cited below, where several details
might be worth reading. For instance, plot size slightly varies among plots:
Plot No. 1=2509.7 m^{2}
, Plot No. 2=2474.8 m^{2}
,
Plot No. 3=2415.9 m^{2}
, and Plot 4=2482.8 m^{2}
.
References
- Kindermann G. Kristofel F, Neumann M, Rossler G, Ledermann T & Schueler. 2018. 109 years of forest growth measurements from individual Norway spruce trees. Sci. Data 5:180077 doi:10.1038/sdata.2018.77
Examples
data(spataustria)
head(spataustria)
df<-spataustria
oldpar<-par(mar=c(4,4,0,0))
bord<-data.frame(
x=c(min(df$x.coord),max(df$x.coord),min(df$x.coord),max(df$x.coord)),
y=c(min(df$y.coord),min(df$y.coord),max(df$y.coord),min(df$y.coord))
)
plot(bord,type="n", xlab="x (m)", ylab="y (m)", asp=1, bty='n')
points(df$x.coord,df$y.coord,col=df$plot,cex=0.5)
par(oldpar)