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Moisture Controls on Trace Gas Fluxes in Semiarid Riparian Soils

^a USDA-ARS, U.S. Water Conservation Lab., 4331 East Broadway Rd., Phoenix, AZ 85040
^b Dean A. Martens (deceased), USDA-ARS, Southwest Watershed Research Center, 2000 East Allen Rd., Tucson, AZ 85719

View larger version (24K): [in a new window]   Fig. 1. Soil surface temperature in three vegetation zones on measurement dates during 15-mo monitoring period at the San Pedro Riparian National Conservation Area (SPRNCA).

View larger version (45K): [in a new window]   Fig. 2. Environmental variables measured during monsoon 2003 using data loggers installed in each vegetation zone from May 30 (Julian Day 150) to September 27 (Julian Day 270). Figures show averaged data for mesquite (a and b) and grassland (open and sacaton, c and d) sites. No significant differences ( > 0.05) were found between environmental data collected at two grassland sites.

View larger version (40K): [in a new window]   Fig. 3. Carbon dioxide (a) and nitrous oxide (b) efflux and methane (c) consumption in three SPRNCA vegetation sites on measurement dates during 15-mo monitoring period (July 2002 through September 2003). Symbols are averaged values from 2 or 3 flux collars installed at each site.

View larger version (27K): [in a new window]   Fig. 4. Isotopic composition of carbon dioxide respired from soil surface in three SPRNCA vegetation sites on measurement dates during monsoon and post-monsoon (July through December) 2002. Symbols are averaged values of two carbon dioxide collections per site on each sampling date, plus or minus standard deviation.

View larger version (15K): [in a new window]   Fig. 5. Methane consumption (0–45 cm) in laboratory incubations of open/forb vegetation area soils. Symbols are averaged values of duplicate incubations, plus or minus standard deviation.