Biomass of harvested annual and perrenial forbs and grasses along fertilized and unfertilized ecosystem transects at the Jornada Basin LTER site in 1989

This data package contains biomass data for annual or perennial
grasses and forbs harvested from quadrats along the Jornada Basin
LTER (LTER-I) transects in southern New Mexico, USA. These transects
are located in a livestock exclosure established in 1982 in the
Chihuahuan Desert Rangeland Research Center (CDRRC) and run from the
middle of the College Playa up to the foot of Mt. Summerford (2.7 km
in length). Prior to the exclosure, the study site was moderately to
heavily grazed for the past 100 years. The Treatment transect was
treated annually with ammonium nitrate fertilizer (NH4NO3 at 10g
N/m2/yr) until 1987. Along each transect, 91 stations, each with a
plant intercept line, are spaced at 30 meter intervals. Each plant
intercept line is perpendicular to the transect and is 30 meters in
length broken into 5-meter segments. The included dataset includes
biomass data for grasses and forbs clipped from 1 square meter
quadrats directly downslope from some, but not all, of these
segments. The harvest measurements occurred in September 1989. Data
consists of the date, transect, station number, quad, JRN and USDA
Plants species codes, species binomial, habit, form, and biomass.
This study is complete.