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Lethal soil temperatures during burning of masticated forest residues
Mastication of woody shrubs is used increasingly as a management option to reduce fire risk at the wildland-urban interface. Whether the resulting mulch layer leads to extreme soil heating, ifExpand
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  • Open Access
Glyphosate toxicity and the effects of long-term vegetation control on soil microbial communities
Abstract We assessed the direct and indirect effect of the herbicide glyphosate on soil microbial communities from ponderosa pine (Pinus ponderosa) plantations of varying site quality. Direct, toxicExpand
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Changes in microbial community structure following herbicide (glyphosate) additions to forest soils
Glyphosate applied at the recommended field rate to a clay loam and a sandy loam forest soil resulted in few changes in microbial community structure. Total and culturable bacteria, fungal hyphalExpand
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Behaviour and effects of prescribed fire in masticated fuelbeds
Mechanical mastication converts shrub and small tree fuels into surface fuels, and this method is being widely used as a treatment to reduce fire hazard. The compactness of these fuelbeds is thoughtExpand
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Tree-growth and understory responses to low-severity prescribed burning in thinned Pinus ponderosa forests of Central Oregon
The growth of ponderosa pine and associated understory vegetation was evaluated for a 6 yr period following spring underburning of surface fuels. Underburn and control (unburned) plots were paired atExpand
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Microbial community responses in forest mineral soil to compaction, organic matter removal, and vegetation control
We tested three disturbance hypotheses in young conifer plantations: H1: soil compaction and removal of surface organic matter produces sustained changes in microbial community size, activity, and ...
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  • Open Access
Growth and Nodulation Responses of Rhizobium meliloti to Water Stress Induced by Permeating and Nonpermeating Solutes.
Isolates of Rhizobium meliloti, representing antigenically distinct indigenous serogroups 31 and 17, were grown in yeast extract-mannitol broth (YEM) containing NaCl or polyethylene glycol (PEG) toExpand
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Suitability and use of the 15N-isotope dilution method to estimate nitrogen fixation by actinorhizal shrubs
Nitrogen fixation rates were estimated by the 15 N-isotope dilution method for Ceanothus velutinus and Purshia tridentata in the understory of central Oregon ponderosa pine forests. Field rates wereExpand
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  • Open Access
Compaction Alters Physical but Not Biological Indices of Soil Health
Current management and harvesting practices can compact forest soils and degrade soil health. However, effects of soil compaction on microbial processes and composition are poorly understood. WeExpand
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  • Open Access