hfeifbytree {lgrdata}

I x F at the HFE - tree observations

Description

Heights and stem diameters of trees growing in a fertilization x irrigation experiment in Richmond, New South Wales, Australia, as part pf the Hawkesbury Forest Experiment (HFE). A total of 16 plots, each with 72 Eucalyptus saligna trees, was remeasured 17 times between 2008 and 2012. Treatments to the plots were either control (C), applied with fertilizer (F), irrigation (I), or irrigation+fertilization (IF).

This dataset contains the tree-level observations, see hfeifplotmeans for averaged data.

Usage

hfeifbytree

Format

A data frame with 9592 rows and 6 variables:

ID

integer A unique identifier for each tree.

plotnr

integer A total of sixteen plots (four treatments).

treat

integer One of four treatments (I - irrigated, F - dry fertilized, IL - Liquid fertilizer plus irrigation, C - control)

Date

factor The date of measurement (YYYY-MM-DD)

height

double Mean height for the sample trees ($m$).

diameter

double Mean diameter for the sample trees ($cm$).

Source

Data courtesy of Craig Barton and Burhan Amiji, from Western Sydney University.

Examples

# Variable sample sizes over time. On many occassions, subsamples were measured.
data(hfeifbytree)
ftable(xtabs(~Date+treat, data=hfeifbytree))