Author(s)

Deborah S. Page-Dumroese^1*, Matt D. Busse², Steven T. Overby³, Brian D. Gardner⁴, Joanne M. Tirocke¹

¹USDA Forest Service, Rocky Mountain Research Station, Moscow, USA.
²USDA Forest Service, Pacific Southwest Research Station, Davis, USA.
³USDA Forest Service, Rocky Mountain Research Station, Flagstaff, USA.
⁴USDA Natural Resource Conservation Service, Moscow, USA.

Soil quality assessments are essential for determining impacts on belowground microbial community structure and function. We evaluated the suitability of active carbon (C), a rapid field test, as an indicator of soil biological quality in five paired forest stands (clear cut harvested 40 years prior and unharvested) growing on volcanic ash-cap soils in northern Idaho. Active C was compared with several traditional measures of soil microbial properties (microbial biomass, respiration, fungal hyphal biomass, bacterial number and biomass and PLFA community structure). Despite the significant differences in forest vegetation between paired stands, no differences in active C and only a few significant differences in microbial properties were detected. Total bacteria (microscope counts) and PLFA signatures (gram positive bacteria, gram negative bacteria, actinomycetes) were significantly higher in the managed stands. Our results indicate that either mineral soil biological properties in managed stands were relatively unaffected at the time of harvest or some biological recovery occurred 40 years later. Additionally, volcanic ash-cap soils in moist ecosystems could be highly resilient to the impacts of harvest operations and therefore few significant biological changes could be detected.

Soil Quality, Forest Soil, Soil Monitoring, Soil Organic Matter

Page-Dumroese, D. , Busse, M. , Overby, S. , Gardner, B. and Tirocke, J. (2015) Impacts of Forest Harvest on Active Carbon and Microbial Properties of a Volcanic Ash Cap Soil in Northern Idaho. Open Journal of Soil Science, 5, 11-19. doi: 10.4236/ojss.2015.51002.