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Filtering by: Subject Soil microbiology -- Washington (State) Degree Field Soil Science

Morphology, genesis, and classification of soils forming in recent age tephra deposits from Mt. St. Helens volcano

Creator:

Johnson, Mark E.

Abstract:

The morphology, genesis, and classification of soils forming in multiple tephra deposits of recent age from Mt. St. Helens volcano in southwestern Washington Cascade Mountains was studied. Soils which occupied well drained and poorly drained positions on the landscape were characterized according to their morphology and the results of analyses...

Resource Type:

Masters Thesis

Full Text:

et al. (1968). The most recent and extensive studies on soil genesis in the Cascades of Washington
Silicic acid and oxidizable carbon movement in a Walla Walla silt loam as related to long-term residue and nitrogen applications

Creator:

Douglas, Clyde Lee

Abstract:

Intensive cultivation of Walla Walla silt loams (coarse silty, mixed, mesic, typic Haploxeroll) in eastern Oregon and Washington during the past 50 years, has decreased internal soil drainage in the 15 to 40 cm layer. However, no measurements have been made to determine the causes and corrective management for this...

Resource Type:

Dissertation

Full Text:

) in eastern Oregon and Washington during the past 50 years, has decreased internal soil drainage in
Microbial community structure as influenced by season and stand age in a Douglas-fir (Pseudotsuga menziesii) ecosystem

Creator:

Kucera, Jennifer Moore

Abstract:

Forest harvest can have significant impacts on forest ecosystems that may influence the capacity of soils to sequester carbon (C). The microbial community controls decomposition, which is a critical process in partitioning litter- and root-C between CO₂ and storage in semi-permanent soil-C pools. The objectives of this study were to...

Resource Type:

Dissertation

Full Text:

study management and soil microbiology interactions. The objective of this dissertation was to use