trlpsptime: Long term tree-list data from permanent sample plots

In biometrics: Functions and Datasets for Forest Biometrics and Modelling

Long term tree-list data from permanent sample plots

Description

Temporal tree-level data within four sample plots in an experimental forest in Austria. The dataframe contains several tree-level variables. Plot sizes are 2500 m^{2} (approx.) and the current dataframe only keeps the measurement years having a more reliable amount of records.

Usage

data(trlpsptime)

Format

Contains tree-level variables, as follows:

plot

Plot number.

tree

Tree identificator.

species

Species code as follows: PCAB=Picea abies, LADC=Larix decidua, PNSY=Pinus sylvestris, FASY=Fagus Sylvatica, QCPE=Quercus petraea, BTPE=Betula pendula.

year

Year of measurement.

obs

Observation.

dbh

Diameter at breast-height, in mm.

dbh2

Orthogonal measured second diameter, in mm.

hmk

Selection criteria to measure tree height. 1=systematic, 2=systematic and in the group of the 100 thickest, 3=belongs to the 100 thickest, 4=lying tree, 5:Standing tree with a ladder, 6=outlier, 7=from stem analysis.

kh

Type of the height measurement. 0:tree height, 1:angle and distances.

ho

Tree height in dm when kh=0. When kh=1 then distance to the tree in dm or in 1977 length of the base bar in cm.

ka

Height to the crown base in dm when kh=0. When kh=1 then angle to the tree top in 1/10 degree.

kb

Crown width in dm when kh=0. When kh=1 then angle to 1.3 m above tree base in 1/10 degree.

wka

Angle to crown base in 1/10 degree.

crown.cl

Crown class according to Kraft. 1=predominant, 2=dominant, 3=co-dominant, 4=dominated, 5=overtopped.

crown

Crown quality. 0=normal, 1=broken in the crown region, 2=substituted tree top, 3=forked, 4=bushy, stork nest, witches' broom, 5=wizen tree top, 6=again broken tree top.

stem

Stem quality. 0=typical, 1=crooked, 2=abiotic damaged, 3=biotic damaged, 4=forked stem without damage, 5=forked stem with damage, 6=up to 1/3 of the girth is peeled, 7=more than 1/3 of the girth is peeled, 8=broken stem, 9=other stem damages.

defoliation

crown defoliation. 1=low, 2=medium, 3=much.

Source

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. Data were retrieved from the paper cited below, where several details might be worth reading.

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 \Sexpr[results=rd]{tools:::Rd_expr_doi("10.1038/sdata.2018.77")}

Examples

data(trlpsptime)
df<-trlpsptime    
head(df) 
tapply(df$dbh, list(df$year,df$plot), mean)

biometrics documentation built on April 4, 2025, 12:35 a.m.