This experiment is part of the Loma Ridge Global Change Experiment, established by Michael Goulden in 2007. There are two ecosystem types, grassland and shrubland, with more studies completed in the grassland. The plots in the shrubland are 4 times the area and twice the height of the grassland. In 2014, half of the manipulated plots were designated "recovery" plots and the precipitation manipulation was ended. This experiment is also split-plot factorial with nitrogen addition (60 kg/ha/yr).