Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 39 for “"old field"”.
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Intraspecific trait variation and community assembly in old-field grasslands
… spatial and temporal environmental variation in old-field plant communities in the eastern United States. In the first study I analyzed spatial patterns of functional divergence in old fields in central New York on spatial scales from 1-1500 m. Results showed that spatial divergence in functional …
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Succession of an Iowa sand prairie into an adjoining old-field
1 PDF file (ix, 128 pages)
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A comparison of yield estimation techniques for old-field loblolly pine plantations
Efficient management of loblolly pine (Pinus taeda) plantations requires accurate estimation of stand yield at rotation. Methods of estimating yield from stand variables, existing number of trees per acre, height of the dominant and co-dominant stand, and stand age, are presented. These methods …
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Constraints to tree invasion on a nutrient-rich site during old-field succession
… controlling tree seedling establishment during old-field succession in east central Illinois. Seed bank density and its concentration beneath woody plants matched patterns observed for seed rain in fields last cultivated in 1968 and 1984. 736 seed traps, monitored monthly for 3$1\over2$ years, …
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Litter production and accumulation in naturally seeded, old-field, Virginia pine (Pinus virginiana Mill.) stands
… collected from stands of 7, 13, 19 and 36-year-old naturally seeded, old-field, Virginia pine. The pattern of yearly litter-fall was highly seasonal with maximum needlefall occurring during the fall months. Estimated annual total litterfall ranged from2.90mt/ha dry weight in the 7-year-old stand …
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Evaluating Tree Seedling Survival and Growth in a Bottomland Old-field Site: Implications for Ecological Restoration
In order to assess the enhancement of seedling survival and growth during drought conditions, five-hundred bare-root seedlings each of Shumard oak (Quercus shumardii Buckl.) and green ash (Fraxinus pennsylvanica Marsh.) were planted each with four soil amendments at a Wildlife Management Area in …
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Timing matters: Responses of a mesic old-field meadow to global change manipulations differed after five versus 13 years
… these drivers on the structure and function of old-field meadows, which are common across eastern Canada. My study addresses the following questions: What is the relative importance of the separate and combined effects of altered soil water and nutrient availability in determining: 1) ecosystem …
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Vegetation structure and inferred patterns of functional group attrition in a shrub encroached old field and tallgrass prairie mosaic
… site is a 65 ha (160 acre) tallgrass prairie and old field mosaic in Lake County, Illinois. The three main objectives in this study are to: (1) analyze and classify plant communities, (2) explore seed bank dynamics and its contribution to old field colonization, and (3) determine the patterns of …
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Assessment of silvicultural practices to improve survival and growth of pioneer and mid-successional hardwoods on old field restoration sites
… willow oak (Quercus phellos L.) planted on an old field riparian area in the Virginia Piedmont. American sycamore seedlings subjected to greenhouse flood preconditioning had 25% greater height and willow oak seedlings grown under normal greenhouse conditions had 18% greater diameter, but these …
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The relative effect of soil changes associated with old-field succession and available moisture upon the growth of three upland tree species
… changes in soil characteristics associated with old-field succession and (2) available moisture upon the growth of three upland tree species.
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Evaluation of shrub removal effects on understory richness and diversity in a native grassland
… 65 ha matrix of native tallgrass prairie and old field habitats that underwent treatment for wide-spread and intensive shrub encroachment in 2010. The study questions were: (1) How does shrub removal affect plant communities, both in terms of the vegetation parameters and the community …
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Relationships between body size, reproduction, and abundance in natural vegetation
… relationship between minimum reproductive threshold size (MRTS) and maximum resident plant size (MAX); however, a more accurate measure of maximum potential body size (MPBS) was needed (without competition), as typically the effects of competition are size-dependent. An isometric relationship, …
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Macro to Micro Legacies of Landuse at the Calhoun Critical Zone Observatory
… management and finally into secondary old-field mixed pine forests which typify the post-agricultural landscape of the Southeastern US. </p><p>In the first chapter it was observed that most of the landscape area consists of hillslopes and that quantifying the spatial patterns and …
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Floristic quality assessment of grassy slough preserve in Johnson County, Illinois
… composition during the earliest stages of old field succession in bottomland forest, and even less old field succession focusing on the herbaceous as well as the woody component in bottomland areas within the LMRAV. The Nature Conservancy purchased a 1,155-hectare farm within the northern …
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Characterization of aged polymer modified asphalt cements for recycling purposes
… been ascertained and found to be minimal. Two field aged polymer modified asphalt cements were extracted from field-aged asphalt cores. An eight year old field aged polymer modified asphalt binder was recovered from a wearing course mixture located on US61 Hwy in Livingston Parish, Louisiana. …
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Evaluating Nitrogen Containing Controlled Release Fertilizers At Stand Establishment In Loblolly Pine
… was evaluated in a greenhouse study and at two field trials in the Virginia Piedmont, in 2002 and 2003. The greenhouse study evaluated five fertilizer treatments; 1) check with no fertilizer; 2) granular ammonium nitrate (10-10-10 + micro-nutrients) applied to the soil surface; 3) granular …
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A Study of Habitat Selection and Fluctuating Asymmetry of <em>Amybstoma tigrinum</em> at Henderson Island Wildlife Management Area in Jefferson County TN.
… a blackberry (<em>Rubus sp.</em>) dominated old-field, a grassy field, and a shrub-grass mix field, which were all adjacent to the ponds. No statistical difference in FA between the 2 ponds.</p>
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Hostplant-Related Causes of Unequal Parasitoid Exploitation of Two Leafminers, Tildenia Georgei and Tildenia Inconspicuella (Lepidoptera: Gelechiidae), on Solanaceous Weeds (Defensive Behavior, Life History, Plant Trichomes, Species Richness, Enemy-Free Space)
… Solanum carolinense), sampled in a large old field in Mason Co., Illinois, U.S.A., June-August, 1977-1980, differed markedly in vulnerability to parasitoids. Only two primary parasitoid species consistently parasitized T. georgei (n = 2317 leafminers reared). T. inconspicuella (n = 3354) …
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