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Aspen Harvest Intensity Decreases Microbial Biomass, Extracellular Enzyme Activity, and Soil Nitrogen Cycling

School of Natural Resources & Environment, Univ. of Michigan, Ann Arbor, MI 48109-1115

View larger version (26K): [in a new window]   Fig. 1. Locations of study stands in the Huron and Ottawa National Forests in Michigan's Upper and Lower Pennisula, USA.

View larger version (36K): [in a new window]   Fig. 2. Mean total phospholipid fatty acid (PLFA) in harvest treatments. Values have been averaged across study sites, and treatments with the same letter did not differ significantly at = 0.05. Error bars are standard errors of the mean.

View larger version (25K): [in a new window]   Fig. 3. The molar fraction of individual PLFAs in Huron and Ottawa forest soils; values have been averaged across harvest treatments. The PLFAs marked with an asterisk (*) differed significantly at = 0.05.

View larger version (35K): [in a new window]   Fig. 4. Mean gross (A) N mineralization and (B) N immobilization in harvest treatments. For each treatment, means with the same letter are not statistically different at = 0.05.