75Fig. 3.5 Representative parameters affecting net radiation balance on a Bromus tectorum land-
scape over 11 days during the green (May) and senesced (July) months. Parameters were measured
by duplicate sensors separated by about 1 km and positioned at 4-m height and are reported on
30-min intervals. Ecosystem surface temperature of about 10–100-m^2 patches was measured with
infrared thermometers (Apogee, narrow and wide focus sensors), and the ratio of solar radiation
refl ected off the plant/soil surface to incoming (direct and diffuse) solar radiation (i.e., albedo,
measured with two Huksefl ux NR01 4-way sensors per site). From MJ Germino, R Allen, W Zhao,
and C Robison, unpublished data
Fig. 3.6 Monthly ecosystem fl uxes of latent heat and CO 2 on Bromus tectorum (BRTE)- dominated
or sagebrush-steppe communities (ARTR). Data are for two RM Young 8100 and Campbell CSAT
3D sonic anemometers and LiCOR 7500 open-path gas analyzers per site. SE are smaller than
symbols. MJ Germino, R Allen, W Zhao, J Greth, C Robison, unpublished data
3 Ecosystem Impacts of Exotic Annual Invaders in the Genus Bromus