Photosynthetic rates of leaves from reduced and enhanced precipitation treatments at the Jornada Basin LTER site, 2007-2008

This data package contains photosynthetic rate data for leaves
collected from mesquite shrubs and black grama grasses at the
Jornada Basin LTER site in 2007-2008. The purpose of this study was
to quantify ecophysiological performance of shrubs and grasses in
the context of precipitation manipulations. One mesquite and one
black grama leaf from each plot (n = 20 plots; 5 PPT treatments X 4
replicate plots/treatment) were measured 5 times beginning July 2007
and ending in August 2008. Plots were subjected to precipitation
treatments consisting of +/-80%, +/-50%, and ambient/control. A
subset of plots also had a nitrogen addition treatment. Leaves were
excised from plants and immediately measured for photosynthetic rate
under ideal conditions in a LiCor cuvette. This study has been
completed.