trlremeasu {biometrics} | R Documentation |
Tree-level remeasurements for a sample plot in a Pinus radiata plantation
Description
Temporal tree-level data from a sample plot established in a
Monterey pine (Pinus radiata) forestry plantation in Chile.
The plot size is 1600 m^{2}
, and the plantation was established
in 1990.
Usage
data(trlremeasu)
Format
Tree list data for a sample plot remeasured through time, and having the following columns
- plot.id
Plot code.
- tree
Tree number.
- x.coord
Cartesian position in the X-axis, in m.
- y.coord
Cartesian position in the Y-axis, in m.
- year
Measurement year.
- dead
Dead identificator, 0 means alive, and 1 otherwise.
- dbh
diameter at breast-height, in cm.
Source
Data were retrieved from the paper cited below, where several details might be worth reading.
References
- Pommerening A, Trincado G, Salas-Eljatib C, Burkhart H. 2023. Understanding and modelling the dynamics of data point clouds of relative growth rate and plant size. Forest Ecology and Management Volume 529:120652 doi:10.1016/j.foreco.2022.120652
Examples
data(trlremeasu)
head(trlremeasu)
df<-trlremeasu
df$fe<-10000/1600
df$garb.ha<- (pi/40000)*df$dbh^2*df$fe
gha.t<-tapply(df$garb.ha, df$year, sum)
nha.t<-tapply(df$fe, df$year, sum);
time<-as.numeric(rownames(gha.t))
plot(nha.t~time, type="b",las=1)
plot(gha.t~time, type="b",las=1)