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Enzyme Activities and Carbon Dioxide Flux in a Sonoran Desert Urban Ecosystem

^a Environmental Resources Program, Arizona State University East, Mesa, AZ 85212
^b Dep. of Plant Biology, Arizona State Univ. Main, Tempe, AZ 85282

View larger version (18K): [in a new window]   Fig. 1. Average soil temperatures (°C) at 10-cm depth in mesiscape, xeriscape and desert remnant sites in south central Arizona. Numbers are means ± SE. *, ** and *** indicate significance between treatments at P < 0.05, 0.01, and 0.001 level, respectively.

View larger version (21K): [in a new window]   Fig. 2. Seasonal change in invertase activity in mesiscape, xeriscape and desert remnant sites in south central Arizona. Numbers are means ± SE. *, ** and *** indicate significance between treatments within months at P < 0.05, 0.01, and 0.001 level, respectively.

View larger version (23K): [in a new window]   Fig. 3. Seasonal change in cellulase activity in mesiscape, xeriscape, and desert remnant sites in south central Arizona. Numbers are means ± SE. *, ** and *** indicate significance between treatments within months at P < 0.05, 0.01, and 0.001 level, respectively.

View larger version (18K): [in a new window]   Fig. 4. Seasonal change in CO2 flux in mesiscape, xeriscape, and desert remnant sites in south central Arizona. Numbers are means ± SE. *, ** and *** indicate significance between treatments within months at P < 0.05, 0.01, and 0.001 level, respectively.