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Retrospective Theses and Dissertations

Environmental Sciences

Forest biology

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Full-Text Articles in Life Sciences

Riparian Land-Use Impacts On Stream Bank Soil And Phosphorus Losses From Grazed Pastures , Mustafa Tufekcioglu Jan 2006

Riparian Land-Use Impacts On Stream Bank Soil And Phosphorus Losses From Grazed Pastures , Mustafa Tufekcioglu

Retrospective Theses and Dissertations

An emerging challenge in watershed-scale research is to quantify the extent of sediment contributed to receiving waters from stream banks versus overland flow from critical source areas, and to develop management strategies to reduce stream bank erosion. The objective of this research was to compare the amounts of sediment and phosphorus loss from critical stream bank source areas to receiving waters via overland flow and stream bank erosion from riparian grazed pasture under different stocking densities (cow-calf pair ha -1). Rainfall simulations were used to calculate sediment and P loads from overland flow from stream-side livestock loafing and access points ...


Forest Dynamics In Mesic Northern Hardwoods Following Windthrow And Salvage Logging , Katharyn Dianne Derr Jan 2006

Forest Dynamics In Mesic Northern Hardwoods Following Windthrow And Salvage Logging , Katharyn Dianne Derr

Retrospective Theses and Dissertations

Post-disturbance, or salvage, logging is a highly debated topic within natural resource science and management as its effects on forest recovery are not well understood. We examine a 25-year forest response to a 1977 severe wind disturbance on the Flambeau River State Forest in Wisconsin, USA, some of which was salvage logged. Our results show salvage logging affects the rate of vegetation recovery, microtopography, and soil composition within this mixed broad-leaved deciduous and conifer forest. Although salvaged and unsalvaged areas are similar in tree species composition, tree biomass is higher and forest microtopography is more pronounced within the unsalvaged area ...


Five-Year Survival And Growth Of Northern Red Oak (Quercus Rubra L) Seedlings In Upland Hardwood Stands In South Central Iowa , Robert Edward Bardon Jan 1996

Five-Year Survival And Growth Of Northern Red Oak (Quercus Rubra L) Seedlings In Upland Hardwood Stands In South Central Iowa , Robert Edward Bardon

Retrospective Theses and Dissertations

A major concern in the management of Quercus rubra is the the difficulty in regenerating stands that have developed dense understories of shade tolerant species. A study was conducted at two locations in south central Iowa to determine the impact over a five year period of using root graded seedlings, understory control, tree shelters, and overstory reduction on establishing underplanted, 1-0, Quercus rubra bare root stock. Relationships between growth or mortality, and photosynthetically active radiation, red to far red light ratio, basal area, average stand diameter, number of trees/hectare, percent stocking, and various combinations of these variables were tested ...


Riparian Buffer Strips In The Bear Creek Watershed, Murielle Maud Bercovici Jan 1994

Riparian Buffer Strips In The Bear Creek Watershed, Murielle Maud Bercovici

Retrospective Theses and Dissertations

No abstract provided.


Application Of The Creams Model To Simulate Performance Of Riparian Tree Buffer Strips: Implications For Buffer Strip Design, Matthew Forrest Christian Jan 1991

Application Of The Creams Model To Simulate Performance Of Riparian Tree Buffer Strips: Implications For Buffer Strip Design, Matthew Forrest Christian

Retrospective Theses and Dissertations

No abstract provided.


Anatomy And Physiology Of Sugar Maple (Acer Saccharum March) Seedlings Uninoculated Or Inoculated With The Vesicular-Arbuscular Endomycorrhizal Fungus Glomus Etunicatum , William Jesse Yawney Jan 1985

Anatomy And Physiology Of Sugar Maple (Acer Saccharum March) Seedlings Uninoculated Or Inoculated With The Vesicular-Arbuscular Endomycorrhizal Fungus Glomus Etunicatum , William Jesse Yawney

Retrospective Theses and Dissertations

Mycorrhizal inoculation improved the phosphorus (P) nutrition of sugar maple seedlings in the law P study soil. This improved P nutrition was not translated into growth, however. This was interpreted as evidence for the fungal carbohydrate drain or, perhaps, a threshold level of P needed for shoot growth was not reached in the low P soil even with the improved nutrition attributed to the fungus. In addition, inoculation reduced plant carbohydrate levels in the fall and affected the levels of various nutrients in plant parts. It was proposed that a more efficient endophyte, in terms of its effect on P ...


Age-Age Correlations, Trait Correlations, And Wood Property Variation For An Alnus Glutinosa (L.) Gaertn Provenance Study , Terry Lean Robison Jan 1984

Age-Age Correlations, Trait Correlations, And Wood Property Variation For An Alnus Glutinosa (L.) Gaertn Provenance Study , Terry Lean Robison

Retrospective Theses and Dissertations

Age-age (juvenile-mature) correlations for height, diameter-at breast-height (DBH), volume, specific gravity, and fiber length were determined for a 17 year-old Alnus glutinosa (L.) Gaertn. provenance study. The correlations indicated that selection could take place at one-half the rotation age for growth traits, and one-third the rotation age for wood properties. Using early DBH to select for volume at rotation age yielded more gain per year than waiting to select directly for volume at maturity;Trait correlations were positive between growth properties. Correlations between specific gravity and fiber length were mostly positive for single trees, and negative for provenance means. Correlations ...


Genotype X Environment Interaction In European Black Alder (Alnus Glutinosa (L.) Gaertn) , Oghenekome Ukrakpo Onokpise Jan 1984

Genotype X Environment Interaction In European Black Alder (Alnus Glutinosa (L.) Gaertn) , Oghenekome Ukrakpo Onokpise

Retrospective Theses and Dissertations

A subset of 17 provenances from an on-going range-wide provenance study of European black alder (Alnus glutinosa) was evaluated in three locations (Iowa, Illinois and Wisconsin) for growth (total height, height growth rates, diameter and volume) and raw biomass properties (field moisture content, maximum moisture content, specific gravity and stem biomass) as well as leaf tissue nitrogen and flower production;Significant differences were found among provenances for all the traits except bark and field moisture contents. The Iowa location had significantly higher mean performances than either southern Illinois or northern Wisconsin locations. Combined analysis over years and locations showed no ...


Photosynthesis, Photorespiration, And Dark Respiration In Populus X Euramericana: Effects Of Genotype And Leaf Age , Dean Harold Gjerstad Jan 1975

Photosynthesis, Photorespiration, And Dark Respiration In Populus X Euramericana: Effects Of Genotype And Leaf Age , Dean Harold Gjerstad

Retrospective Theses and Dissertations

No abstract provided.


Peroxidase And Growth In Hybrid Poplar , Paul Harland Wray Jan 1974

Peroxidase And Growth In Hybrid Poplar , Paul Harland Wray

Retrospective Theses and Dissertations

No abstract provided.