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Phytostabilization Potential of Quailbush for Mine Tailings

Growth, Metal Accumulation, and Microbial Community Changes

^a Dep. of Soil, Water, and Environmental Science, Univ. of Arizona, 429 Shantz Building #38, Tucson, AZ 85721-0038
^b Environmental Research Lab., 2601 E. Airport Drive, Tucson, AZ 85706

View larger version (21K): [in this window] [in a new window]   Fig. 1. Final mean total (shoot + root) dry mass of quailbush grown in mine tailings-compost mixtures (mean + 1 SD). Treatment designations are as follows: K4 (pH 2.7); K6 (pH 5.7); OS (offsite control); CC (compost control); number following K4 and K6 are percentage mine tailings. A one-way ANOVA determined there were significant differences between treatments (p < 0.0001). All plants in the K4–100 treatment died; therefore, this data was not included in the analysis. Means with different letters are significantly different at p < 0.05 (Tukey's HSD test).

View larger version (21K): [in this window] [in a new window]   Fig. 2. Initial and final population estimates (most probable number [MPN] g–1) of autotrophic iron and sulfur oxidizers in bulk mine tailings-compost mixtures. Treatment designations are as follows: K4 (pH 2.7); K6 (pH 5.7); OS (offsite control); CC (compost control); number following K4 and K6 are percentage mine tailings. Several treatments were undetectable (UD) at the 10–2 dilution level. Bars represent the upper and lower limit at a 95% confidence limit (p = 0.05).

View larger version (23K): [in this window] [in a new window]   Fig. 3. (A) Initial bulk, (B) final bulk-planted, and (C) rhizosphere heterotrophic bacterial counts (colony forming units [CFU] g–1) in mine tailings-compost mixtures (mean + 1 SD). Treatment designations are as follows: K4 (pH 2.7); K6 (pH 5.7); OS (offsite control); CC (compost control); number following K4 and K6 are percentage mine tailings. A one way ANOVA determined there were significant differences between treatments for initial mean bulk and final mean bulk-planted heterotrophic counts (p < 0.0001), but there were no significant differences for mean rhizosphere heterotrophic counts (p = 0.7607). All plants in the K4–100 treatment died; therefore, rhizosphere counts were not determined (ND) for this treatment. Means with different letters are significantly different at p < 0.05 (Tukey's HSD test).