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Microbial Biomass Levels in Barren and Vegetated High Altitude Talus Soils

Dep. of Environmental, Population and Organismic Biology, Univ. of Colorado, Boulder, CO 80309-0334 USA

View larger version (18K): [in a new window]   Fig. 1. Properties of talus soils along the SOM gradient. A: %N and %C in soils along the SOM gradient. B: Silt, clay, and sand content of soils along the SOM gradient

View larger version (31K): [in a new window]   Fig. 2. Mean biomass values in vegetated and barren soils. A: total biomass; B: salicylate mineralizers. C: the ratio of salicylate mineralizer biomass to total biomass. Error bars are standard errors, * denotes statistically significant difference between means

View larger version (21K): [in a new window]   Fig. 3. A. Total biomass (circles) and salicylate mineralizers (squares) measured by the SIGR in vegetated soils. B. Total biomass (circles) and salicylate mineralizers (squares) measured by the SIGR in barren soils

View larger version (13K): [in a new window]   Fig. 4. The total biomass correlated with silt content in barren soils