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 76 for “"Seedling establishment"”.
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The influence of rainfall variability on savanna tree seedling establishment
… the rainfall requirements necessary for tree seedling survival of different savanna species in the first year of growth. Results from a field drought experiment showed that dry season survival for seedlings of Acacia nigrescens and Philenaptera vialacea was not related to wet season length. …
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Factors affecting initial seedling establishment of hoodia gordonii in !Khob !Naub conservancy, Namibia, Africa
Abstract provided by author
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Effects of Soil Fungi on Tree Seedling Establishment in a Southeastern Coastal Plain Forest
… of fungi and overstory composition on tree seedling survival and growth were investigated in closed canopy upland forests in the coastal plain of South Carolina. Seedlings of Quercus alba, Cornus florida and Pinus taeda were planted in the understory of two forest types -naturally …
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Riparian Seedling Establishment Defined by Sediment Mobilization and Water Availability In a Gravel Bed River
… flow result in eddies. This thesis predicts the establishment success of riparian seedlings as a function of root growth during the “establishment period” delineated by the seed deposition date, and date of sediment mobilization. Seeds must be deposited during the final spring recession so they …
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Effects of watering interval, planting depth and soil crusting on ermegence and seedling establishment of sorghum (sorghum bicolor (L.) moench)
… depth, and crust formation on emergence and seedling establishment of sorghum. Three separate pot experiments were conducted using three soil types and sorghum as a test crop. Various treatment combinations of soil type/watering interval, soil type/planting depth and soil type/water drop size …
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Effects of watering interval, planting depth and soil crusting on ermegence and seedling establishment of sorghum (sorghum bicolor (L.) moench)
… depth, and crust formation on emergence and seedling establishment of sorghum. Three separate pot experiments were conducted using three soil types and sorghum as a test crop. Various treatment combinations of soil type/watering interval, soil type/planting depth and soil type/water drop size …
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Moving the needle on prairie conservation: a Palouse Prairie restoration/reconstruction needs assessment and the effect of intra-annual soil moisture changes on Balsamroot seedling establishment
… intra-annual soil moisture fluctuations on the seedling establishment of Arrowleaf balsamroot (Balsamorhiza sagittata), since establishment of slow growing perennial species like balsamroot remains a challenge for restoration projects. We interviewed fourteen restoration practitioners from …
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PATTERNS OF SEEDFALL AND SEEDLING ESTABLISHMENT IN AN EAST TEXAS RIVER FLOODPLAIN FOREST: THE CONTRIBUTION OF SEEDLING DYNAMICS TO SPECIES COEXISTENCE (PLANT DEMOGRAPHY, DISPERSAL, TREE REGENERATION, SURVIVORSHIP, MORTALITY)
… and temporal patterns of seed deposition, seedling appearance, survivorship, and growth in an East Texas river floodplain forest from 1980 through 1984, and estimated the importance of several factors including flooding, drought, shading, insect herbivory, and fungal attack in causing …
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Grass root gaps : an establishment bottleneck limits trees in savannas and excludes them in South Africa's highveld grasslands
… the availability of suitable 'gaps' for tree establishment under high rainfall conditions. Demographic bottlenecks on Acacia species populations were determined by examining the ratio of juvenile plants to adult carrying capacity. Below-ground root biomass was quantified in 10cm layers to a …
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Untangling clumps-factors influencing seedling ecology in a semi-desert, and the implications for restoration ecology
… I tested the relevance of these processes to seedling establishment of perennial species on degraded landscapes in Namaqualand, South Africa. The species were grouped into two functional guilds, Mesembryanthema (formerly the family Mesembryanthemaceae, but now part of the Aicoaceae; hereafter …
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Seedling emergence and growth of winter barley as affected by sowing date and sowing depth: a dissertation submitted in partial fulfilment of the requirements for the degree of Bachelor of Agricultural Science with Honours in the University of Canterbury
Establishment and growth of winter barley, c.v. "Illia", was compared at five sowing dates (22 April, 2, 14 and 30 May and 20 June) and two nominal sowing depths (20 mm and 50 mm) at Lincoln, Canterbury. Seedling emergence rate, total emergence and canopy development (number of leaves on the main …
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Constraints to tree invasion on a nutrient-rich site during old-field succession
… addressed the factors 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 …
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Island Biogeography and Restoration: The Role of Living Fence Islands as Regeneration Foci in the Rehabilitation of Degraded Lands in Honduras
A total of 543 seedlings of 41 species established in islands. Seedling number did not differ among island types, although a trend toward greater density was apparent in artificial islands. Species richness was greater in Gliricidia islands than in Bursera or open pasture islands. Seedlings were …
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Regional Rarity: Consequences of Dispersal Limitation and Strategies for Reintroduction
… to influence the distribution and population establishment of plant species in restored xeric glades in the Missouri Ozarks: USA). First, I used a trait analysis of species in restored glades to determine whether traits related to niche breadth, persistence, or dispersal ability are related to …
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Soil drying cycles in the succulent Karoo : different rooting systems and water uptake
… of compatibility between close neighbours and seedling establishment under adult plants. The shallow-rooting Leipoldtia showed the highest rates of soil moisture depletion in both the shallow and deeper soil zones, and is therefore a strong competitor for water and probably an undesirable …
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Climatic influences on sagebrush establishment in Arid Rangelands: Applications for rangeland rehabilitation.
… recruitment were reasonably good predictors of seedling establishment. Patterns in seedling establishment showed strong patterns in timing of recruitment pulses for individual species or subspecies, even though study sites were not located geographically close to one another. The most …
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Understanding Forest Landscape Response to Global Climatic Change: An Uncertainty Evaluation Based on Spatial Modeling
… physiology (e.g. net primary production) and seedling establishment response at the species level, the colonization and competition response at the forest succession level, and the species composition response at the community level. For this purpose, a forest landscape model (LANDIS-II) was …
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Bird perches and soil amendments as revegetation techniques for landslides in Puerto Rico
… of the topsoil layer is detrimental to plant establishment and plant succession as it contains the soil seed bank, as well as the majority of the nutrients essential for plant growth. In this study, I introduced bird perches to six Puerto Rican landslides with three types of surfaces (bare, …
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