| arizona {plspm} | R Documentation |
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.
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.
Source
Mixed data from Whittaker et al (1968), and Whittaker and Niering (1975). See References below.
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