Figure 1From: Denitrification from nitrogen-fixing biologically crusted soils in a cool desert environment, southeast Utah, USAAcetylene reduction assays of biological nitrogen fixation activity in biologically crusted soils incubated under a range of temperature and moisture regimes. Values and means ± 1 SE. (A) Light crust and (B) dark crust. Legend values indicate water additions to simulate 0.05, 0.2, 0.6, and 1 cm rainfall events.Back to article page