Prescribed fire in Eastern Oregon ponderosa pine forests : relationships between soil fertility and ecology Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/8049g7390

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  • I conducted two separate studies, both related to the impacts of spring and fall prescribed fire on ponderosa pine (Pinus ponderosa Dougl. ex Loud.) forest soils in Eastern Oregon. The studies were either conducted at or linked to four stands of ponderosa pine, in the Malheur National Forest. Each stand received three treatments: spring prescribed burn, fall prescribed burn and no burn. For the first study, ion exchange resin bags were used to measure the relative concentrations of NO 3-, NH4+, Ca+, K+, PO4, Na+, total P and total S in the soil solution under the three different treatments. The second study focused on soil ecology and consisted of three projects: microarthropod feeding preference trials, microarthropod stable isotopes (8 15N and 613C) as indicators of feeding habits and the role of microarthropod grazing in fungal competition. All arthropods and fungi used were either collected at the Eastern Oregon field sites or selected as representative species for ponderosa pine forest soils. Most microarthropods exhibited distinct feeding preferences in the feeding preference trials. Isotopic ratios (for 8 13C and 5 15N) suggested that different microarthropod species have distinct diets in the field. Isotope ratios appear to be indicators of trophic level for soil microarthropods. Fungal competition experiments indicated that microarthropod grazing can sometimes alter fungal competition and can therefore shape the fungal community.
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