plspm (version 0.4.9)

arizona: Arizona vegetation dataset

Description

This dataset gives the measurements of 16 vegetation communitites in the Santa Catalina Mountains, Arizona. The measurements were taken along different elevations from fir forest at high elevations, through pine forest, woodlands, and desert grassland.

Usage

arizona

Format

A data frame with 16 observations and 8 variables. The variables refer to three latent concepts: 1) ENV=environment, 2) SOIL=soil, and 3) DIV=diversity.

Num	Variable	Description	Concept
1	env.elev	Elevation (m)	environment
2	env.incli	Terrain inclination (degrees)	environment
3	soil.ph	Acidity and base saturation	soil
4	soil.orgmat	Organic matter content (perc)	soil
5	soil.nitro	Nitrogen content (perc)	soil
6	div.trees	Number of species of trees	diversity
7	div.shrubs	Numer of species of shrubs	diversity
8	div.herbs	Number of species of herbs	diversity

The complete name of the rows are: 1) Abies lasiocarpa, 2) Abies concolor, 3) Pseudotsuga menziesii-Abies Concolor, 4) Pseudotsuga menziesii, 5) Pinus ponderosa-Pinus strobiformis, 6) Pinus ponderosa, 7) Pinus ponderosa-Quercus, 8) Pinus chihuahuana, 9) Pygmy conifer-oak scrub, 10) Open oak woodland, 11) Bouteloua curtipendula, 12) Spinose-suffrutescent, 13) Cercidium microphyllum, 14) Larrea divaricata, 15) Cercocarpus breviflorus, 16) Populus tremuloides.

References

Whittaker, R. H., Buol, S. W., Niering, W. A., and Havens, Y. H. (1968) A Soil and Vegetation Pattern in the Santa Catalina Mountains, Arizona. Soil Science, 105, pp. 440-450. Whittaker, R. H., and Niering, W. A. (1975) Vegetation of the Santa Catalina Mountains, Arizona. V. Biomass, Production, and Diversity Along the Elevation Gradient. Ecology, 56, pp. 771-790.

Examples

  data(arizona)
  arizona