Index Catalog // ScholarsArchive@OSU

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:: influence the capacity of soils to sequester carbon (C). The microbial community controls decomposition

The Biogeochemistry of nitrogen and phosphorus cycling in native shrub ecosystems in Senegal

Creator:: Dossa, Ekw'e Lokossou, 1960-
Abstract:: Two native shrub species (Piliostigma reticulatum and Guiera senegalensis) are prominent vegetation components in farmers’ fields in Senegal. However, their role in nutrient cycling and ecosystem function has largely been overlooked. A study including both laboratory and field experiments was conducted to evaluate potential biophysical interactions of the two shrub...
Resource Type:: Dissertation
Full Text:: Abstract approved: Richard P. Dick Two native shrub species (Piliostigma reticulatum and Guiera

Soil biochemical measures as ecological indicators across agricultural and forest ecosystems of Oregon

Creator:: Knight, Timothy R.
Abstract:: A variety of soil properties have been proposed and tested as potential indicators of soil quality. This study was conducted in an effort to produce a standardized soil quality index for systems in Oregon. Soils in both forested and agricultural systems were sampled in a wide variety of locations, climates,...
Resource Type:: Masters Thesis
Full Text:: Ecological Indicators Across Agricultural and Forest Ecosystems of Oregon Abstract approved Richard P. Dick

Fatty acid profiling of soil microbial communities : a comparison of extraction methods and temporal dynamics in plant residue amended soils

Creator:: Fernandes, Marcelo Ferreira
Abstract:: A method based on fatty acid (FA) analysis is used to profile microbial community structure (MCS). Various extraction protocols are available, which alter the types of FAs extracted from soils. The more time consuming but widely used protocol extracts only FAs from phospholipids (PLFA). This technique is desirable because PLFAs...
Resource Type:: Dissertation
Full Text:: samples. Schutter and Dick (2000) reported, based on identification with MIDI software, 17:1 ω7c and

Influence of cropping and sulfur fertilization on sulfur transformations in soil

Creator:: Castellano, Steven D.
Abstract:: A 2-year field study was conducted on the effects of two sulfur fertilizers (calcium sulfate or elemental S, 0 or 50 kg S ha⁻¹ yr⁻¹) on the distribution of sulfur fractions (inorganic sulfate, C-bonded, ester sulfate, and residual S), arylsulfatase enzyme activity, and microbial biomass carbon (C) and sulfur (S)...
Resource Type:: Masters Thesis
Full Text:: Fertilization on Sulfur Transformations in Soil. Abstract approved: Redacted for Privacy Richard P. Dick A

Organic soil amendements (sic) : impacts on snap bean common root rot and soil quality

Creator:: Cespedes Leon, Maria Cecilia
Abstract:: Common root rot is a major disease of commercially grown snap bean (Phaseolus vulgaris L.) on the irrigated sandy soils of central Wisconsin. The objective of this study was to determine the relationships between soil properties and suppressiveness to common root rot of snap bean (causal agent Aphanomyces euteiches) in...
Resource Type:: Masters Thesis
Full Text:: Amendments: Impacts On Snap Bean Common Root Rot And Soil quality Abstract approved: Richard P. Dick

Activity, composition and structure of soil microbial communities in Savannahshrubs of agroecosystems in semi-arid Senegal

Creator:: Diedhiou, Sire
Abstract:: Piliostigma reticulatum and Guiera senegalensis are two native shrubs that coexist with row crops in parkland systems of the Sahel of Africa. Although permanently green all year around in soil depleted in nutrients and dry for a nine-month period, these shrubs have been largely overlooked. Conventional management of these shrubs...
Resource Type:: Dissertation
Full Text:: : ___________________________________________________________________ Richard P. Dick Piliostigma reticulatum and Guiera senegalensis are two native shrubs that

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
Full Text:: C levels than do monoculture soils with little or no organic matter inputs (Dick, 1992). Crop

The influence of phosphatase-producing bacteria on phosphatase activity and available phosphorus in soil

Creator:: Nelson, Sheila J.
Resource Type:: Masters Thesis
Full Text:: Abstract approved: Richard P. Dick Phosphorus (P) is frequently a limiting soil nutrient because it is

Sulfur oxidation and rhodanese activity in soils

Creator:: Deng, Shiping
Resource Type:: Masters Thesis
Full Text:: : Redacted for privacy Richard P. Dick Elemental S (S°) is an economical source of sulfur fertilizer but

ScholarsArchive@OSU

Microbial community structure as influenced by season and stand age in a Douglas-fir (Pseudotsuga menziesii) ecosystem

The Biogeochemistry of nitrogen and phosphorus cycling in native shrub ecosystems in Senegal

Soil biochemical measures as ecological indicators across agricultural and forest ecosystems of Oregon

Fatty acid profiling of soil microbial communities : a comparison of extraction methods and temporal dynamics in plant residue amended soils

Influence of cropping and sulfur fertilization on sulfur transformations in soil

Organic soil amendements (sic) : impacts on snap bean common root rot and soil quality

Activity, composition and structure of soil microbial communities in Savannahshrubs of agroecosystems in semi-arid Senegal

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

The influence of phosphatase-producing bacteria on phosphatase activity and available phosphorus in soil

Sulfur oxidation and rhodanese activity in soils

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