graze {ecodist}R Documentation

Site information and grazed vegetation data.

Description

This data frame contains site location, landscape context and dominant plant species abundances for 25 of the plant species found in 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 25 variables.

sitelocation

Site location along a geographic gradient.

forestpct

Percentage forest cover within a 1-km radius.

ACMI2

Percentage canopy cover.

ANOD

Percentage canopy cover.

ASSY

Percentage canopy cover.

BRIN2

Percentage canopy cover.

CIAR4

Percentage canopy cover.

CIIN

Percentage canopy cover.

CIVU

Percentage canopy cover.

DAGL

Percentage canopy cover.

ELRE4

Percentage canopy cover.

GAMO

Percentage canopy cover.

LOAR10

Percentage canopy cover.

LOCO6

Percentage canopy cover.

LOPE

Percentage canopy cover.

OXST

Percentage canopy cover.

PLMA2

Percentage canopy cover.

POPR

Percentage canopy cover.

PRVU

Percentage canopy cover.

RAAC3

Percentage canopy cover.

RUCR

Percentage canopy cover.

SORU2

Percentage canopy cover.

STGR

Percentage canopy cover.

TAOF

Percentage canopy cover.

TRPR2

Percentage canopy cover.

TRRE3

Percentage canopy cover.

VEOF2

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.

Author(s)

Sarah Goslee

Source

Details of these data are available in Tracy and Sanderson (2000) and Goslee and Sanderson (2010). The 1992 NLCD data can be obtained from http://www.mrlc.gov/. Species codes are from http://plants.usda.gov (2010).

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.

Goslee, S.C., Sanderson, M.A. 2010. Landscape Context and Plant Community Composition in Grazed Agricultural Systems. Landscape Ecology 25:1029-1039.

Examples

data(graze)

[Package ecodist version 2.0.9 Index]