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.
data(graze)A data frame with 50 observations on the following 67 variables.
sitelocationSite location along a geographic gradient.
forestpctPercentage forest cover within a 1-km radius.
ACMI2percentage canopy cover
AGGI2percentage canopy cover
AGROS2percentage canopy cover
ANAR6percentage canopy cover
ANODpercentage canopy cover
ARMI2percentage canopy cover
ASSYpercentage canopy cover
BRCA5percentage canopy cover
BRIN2percentage canopy cover
CEFO2percentage canopy cover
CIAR4percentage canopy cover
CIINpercentage canopy cover
CIVUpercentage canopy cover
DACA6percentage canopy cover
DAGLpercentage canopy cover
DRYOPpercentage canopy cover
ELRE4percentage canopy cover
ERANpercentage canopy cover
EUGRGpercentage canopy cover
FERU2percentage canopy cover
FRVIpercentage canopy cover
GAMOpercentage canopy cover
HIERApercentage canopy cover
HOLApercentage canopy cover
HYPUpercentage canopy cover
HYRA3percentage canopy cover
JUEFpercentage canopy cover
LEAU2percentage canopy cover
LEVUpercentage canopy cover
LOAR10percentage canopy cover
LOCO6percentage canopy cover
LOPEpercentage canopy cover
MOVEpercentage canopy cover
OXSTpercentage canopy cover
PEGL2percentage canopy cover
PHAR3percentage canopy cover
PHPR3percentage canopy cover
PLLApercentage canopy cover
PLMA2percentage canopy cover
POAVpercentage canopy cover
POCA17percentage canopy cover
POLA4percentage canopy cover
POLYGpercentage canopy cover
PONO3percentage canopy cover
POPRpercentage canopy cover
POSI2percentage canopy cover
POTENpercentage canopy cover
PRVUpercentage canopy cover
RAAC3percentage canopy cover
RUBUSpercentage canopy cover
RUCRpercentage canopy cover
SIOFpercentage canopy cover
SOLIDpercentage canopy cover
SORU2percentage canopy cover
STGRpercentage canopy cover
STME2percentage canopy cover
SYLA4percentage canopy cover
TAOFpercentage canopy cover
THVUpercentage canopy cover
TRAU2percentage canopy cover
TRHYpercentage canopy cover
TRPR2percentage canopy cover
TRRE3percentage canopy cover
VEOF2percentage canopy cover
VICIApercentage canopy cover
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.
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.