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Filtering by: Alternative title ssim EC 897 Remove constraint Alternative title ssim: EC 897 Degree Field Soil Science Remove constraint Degree Field: Soil Science Degree Name Doctor of Philosophy (Ph.D.) Remove constraint Degree Name: Doctor of Philosophy (Ph.D.)

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Cover crops and biochemical functional diversity in relation to nitrogen availability in soil

Creator:

Burket, John Zimmerman

Abstract:

Nitrogen availability in agricultural soils from fertilizer, plant residue inputs, and soil organic matter has important implications beyond crop yield. Legume winter cover crops and one fourth the recommended N rate on sweet corn resulted in yields equivalent to those at the recommended rate in the Willamette Valley of western...

Resource Type:

Dissertation
Response of soil microbial communities and nitrogen cycling processes to changes in vegetation inputs

Creator:

Brewer, Elizabeth Ann

Abstract:

Changes in the type and amount of plant inputs can occur gradually, as with succession, or rapidly, as with harvesting or wildfire. With global change it is anticipated that both gradual and immediate scenarios will occur at increasing frequency. Changes in vegetation inputs alter the quality and quantity of soil...

Resource Type:

Dissertation
Scaling, ash-driven bistability, and other agents of soilscape genesis discovered while digitally mapping soils of the Blue Mountains, Oregon

Creator:

Almquist, Vance Warner

Abstract:

This dissertation reports on four related, though separate projects. The first project details the process of carrying out a digitally augmented soil mapping (DSM) effort alongside an ongoing survey in Oregon's Ochoco National Forest (ONF) using a Random Forest algorithm. The second chapter describes a initial soil survey in Oregon's...

Resource Type:

Dissertation
Assessing the role of reactive metal species in soil organic matter cycling using chemical imaging

Creator:

Keiluweit, Marco

Abstract:

Intimate associations with reactive metal species permanently protect soil organic matter (SOM) from microbial access and oxidation, contributing to the build-up of organic carbon (C) stocks in soils. It is increasingly recognized, however, that such associations can be reversible and that reactive metal species might even facilitate the oxidation of...

Resource Type:

Dissertation
Water and anion movement in selected soils of western Oregon

Creator:

Hammermeister, Dale P.

Abstract:

Experiments were carried out to study the movement of water and halide anions in perched water tables or saturated zones in the soil and upper rock mantle of eight different experimental sites located on low hills near the western border of the Willamette Valley. At each site the experimental procedure...

Resource Type:

Dissertation

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Academic Affiliation

Crop and Soil Science4
Soil Science1

Advisor

Dick, Richard P.1
Kleber, Markus1
Myrold, David D.1
Noller, Jay S.1
Vomocil, James A.1

Commencement Year

Commencement Year range begin – Commencement Year range end

Current results range from 1978 to 2018

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Committee Member

Kleber, Markus2
Adams, Paul W.1
Bottomley, Peter J.1
Boutton, Thomas W.1
Colwell, Fredrick1
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Creator

Almquist, Vance Warner1
Brewer, Elizabeth Ann1
Burket, John Zimmerman1
Hammermeister, Dale P.1
Keiluweit, Marco1

Date

Date range begin – Date range end

Current results range from 1977 to 2018

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Decade

2010-20193
1990-19991
1970-19791

Degree Field

Soil Science[remove]5

Degree Level

Doctoral5

Degree Name

Doctor of Philosophy (Ph.D.)[remove]5

Language

English [eng]5

License

All rights reserved3

Non-Academic Affiliation

Oregon State University. Graduate School4

Peer Reviewed

No5

Resource Type

Dissertation5

Rights Statement

In Copyright3
Copyright Not Evaluated2

Subject

Carbon cycle (Biogeochemistry)1
Cover crops -- Oregon1
Digital soil mapping1
Ectomycorrhizal fungi1
Forest litter -- Oregon -- H.J. Andrews Experimental Forest1
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