graze {ecodist} | R Documentation |
Site information and grazed vegetation data.
Description
These data contain site location, landscape context and dominant plant species abundances for 50 grazed pastures in the northeastern United States. Elements are the mean values for canopy cover for ten 0.5 x 2 m quadrats.
Usage
data(graze)
Format
A data frame with 50 observations on the following 67 variables.
sitelocation
- Site location along a geographic gradient.
forestpct
- Percentage forest cover within a 1-km radius.
ACMI2
- percentage canopy cover
AGGI2
- percentage canopy cover
AGROS2
- percentage canopy cover
ANAR6
- percentage canopy cover
ANOD
- percentage canopy cover
ARMI2
- percentage canopy cover
ASSY
- percentage canopy cover
BRCA5
- percentage canopy cover
BRIN2
- percentage canopy cover
CEFO2
- percentage canopy cover
CIAR4
- percentage canopy cover
CIIN
- percentage canopy cover
CIVU
- percentage canopy cover
DACA6
- percentage canopy cover
DAGL
- percentage canopy cover
DRYOP
- percentage canopy cover
ELRE4
- percentage canopy cover
ERAN
- percentage canopy cover
EUGRG
- percentage canopy cover
FERU2
- percentage canopy cover
FRVI
- percentage canopy cover
GAMO
- percentage canopy cover
HIERA
- percentage canopy cover
HOLA
- percentage canopy cover
HYPU
- percentage canopy cover
HYRA3
- percentage canopy cover
JUEF
- percentage canopy cover
LEAU2
- percentage canopy cover
LEVU
- percentage canopy cover
LOAR10
- percentage canopy cover
LOCO6
- percentage canopy cover
LOPE
- percentage canopy cover
MOVE
- percentage canopy cover
OXST
- percentage canopy cover
PEGL2
- percentage canopy cover
PHAR3
- percentage canopy cover
PHPR3
- percentage canopy cover
PLLA
- percentage canopy cover
PLMA2
- percentage canopy cover
POAV
- percentage canopy cover
POCA17
- percentage canopy cover
POLA4
- percentage canopy cover
POLYG
- percentage canopy cover
PONO3
- percentage canopy cover
POPR
- percentage canopy cover
POSI2
- percentage canopy cover
POTEN
- percentage canopy cover
PRVU
- percentage canopy cover
RAAC3
- percentage canopy cover
RUBUS
- percentage canopy cover
RUCR
- percentage canopy cover
SIOF
- percentage canopy cover
SOLID
- percentage canopy cover
SORU2
- percentage canopy cover
STGR
- percentage canopy cover
STME2
- percentage canopy cover
SYLA4
- percentage canopy cover
TAOF
- percentage canopy cover
THVU
- percentage canopy cover
TRAU2
- percentage canopy cover
TRHY
- percentage canopy cover
TRPR2
- percentage canopy cover
TRRE3
- percentage canopy cover
VEOF2
- percentage canopy cover
VICIA
- percentage canopy cover
Details
Site locations fall along a southwest-northeast transect through the northeastern United States. This is a synthetic gradient calculated from latitude and longitude.
Forest landcover is taken from the USGS 1992 National Land Cover Dataset. All forest classes were combined, and the percentage within 1 km of the sample sites was calculated using a GIS.
Species codes follow the USDA Plants database. Species with a maximum cover <= 1 have been omitted.
Source
Details of these data are available in Tracy and Sanderson (2000) and Goslee, Sanderson and Tracy (ms in review).
The 1992 NLCD data can be obtained from http://www.mrlc.gov/.
Species codes are from http://plants.usda.gov.
References
Tracy, B.F. and M.A. Sanderson. 2000. Patterns of plant species richness in pasture lands of the northeast United States. Plant Ecology 149:169-180.
Examples
data(graze)
[Package
ecodist version 1.2.2
Index]