R: Site Data for the Shoshone National Forest, Wyoming, USA
shoshsite
R Documentation
Site Data for the Shoshone National Forest, Wyoming, USA
Description
The coniferous forests of the Shoshone National Forest range from lower
elevation woodlands dominated by Pinus flexilis, through forests of
Pseudotsuga menziesii, Pinus contorta, Picea engelmannii, Abies lasiocarpa and
Pinus albicaulis with increasing elevation (Steele et al. 1983). One
hundred and fifty sample plots were chosen at random from a larger set for this
data set; the larger set was stratified by elevation, exposure, surficial
geology, and geographic distribution.
Usage
data(shoshsite)
Format
A data.frame with sample plots as rows, and site variable as columns. Variables
comprise:
elevation
elevation above sea level in meters
aspect
compass orientation of the site in degrees
slope
slope steepness in percent
av
aspect value: (cosd(aspect-30)+1)/2
swb
site water balance: a tipping bucket model of water-year soil water
sprppt
spring precipitation in cm
sumppt
summer precipitation in cm
autppt
autumn precipitation in cm
winppt
winter precipitation in cm
sprtmp
spring mean temperature degrees C
sumtmp
summer mean temperature degrees C
auttmp
autumn mean temperature degrees C
winppt
winter mean temperature degrees C
sprpet
spring potential evapotranspiration in cm
sumpet
summer potential evapotranspiration in cm
autpet
autumn potential evapotranspiration in cm
winpet
winter potential evapotranspiration in cm
sprrad
spring direct and diffuse solar radiation (correcting for topographic
shading)
sumrad
summer direct and diffuse solar radiation (correcting for topographic
shading)
autrad
autumn direct and diffuse solar radiation (correcting for topographic
shading)
win
winter direct and diffuse solar radiation (correcting for topographic
shading)
ffd
frost free days
dday
degree days heat sum
tcol
mean monthly temperature of the coldest month
Note
The data were derived from a multi-year effort by numerous scientists and
field technicians. The project was directed by Kent Houston, Soil Scientist and
Ecologist, Shoshone National Forest. The site data were calculated primarily
by Dr. Niklaus Zimmermann, WSL, Birmensdorf, Switzerland
http://www.wsl.ch/staff/niklaus.zimmermann/biophys.html
Source
Roberts, D.W. 2008. Statistical Analysis of Multidimensional
Fuzzy Set Ordinations. Ecology 89:1246-1260