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 25 for “"tree seedlings"”.
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Lead-Uptake by Selected Tree Seedlings
Made available in DSpace on 2015-05-14T14:58:06Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7310037.PDF: 687859 bytes, checksum: e4c3b7025bc45cbdb108c50ea94cd9f8 (MD5) Previous issue date: 1972
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The Inhibitory Effect of Rhododendron maximum L. (Ericaceae) Thickets on Mycorrhizal Colonization of Canopy Tree Seedlings
… on the regeneration of hardwood and coniferous seedlings. Interactions between Rm thickets and ectomycorrhizal colonization were examined to explain seedling inhibition. Experimental blocks were established in and out of Rm thickets in a mature, mixed hardwood/conifer forest in Macon County, …
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Inhibition of Canopy Tree Seedlings by Thickets of <I>Rhododendron maximum</I> L. (Ericaceae) in an Eastern Deciduous Forest
… of many understory plants including canopy tree seedlings. By effectively lowering the survivorship of woody species trying to establish within thickets, <I>R. maximum</I> could influence stand level regeneration patterns and ultimately the community structure of these deciduous forests. …
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The importance of cotyledon functional morphology and patterns of seed reserve utilization for the physiological ecology of neotropical tree seedlings
… patterns of seed reserve utilization by seedlings during their critical establishment stage. The main objective of this thesis is to examine how these traits differentiate the patterns of seedling growth among tree species found in the tropical moist forest on Barro Colorado Island, …
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Afforestation For Mitigating Against Land Degradation on Kilimanjaro Highlands,Kibosho West Ward,Moshi Rural District
… members and Village leaders and second was tree seedlings production and tree planting by community members. During project implementations training on tree nursery operation at grass root level was conducted. Implementation results show that tree nurseries groups were formed and a number of …
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Linking Cattle, Forage, and Tree Production in Silvopastures
Silvopasture is the intentional integration of trees with forages and livestock. In Blackstone, Virginia a silvopasture management plan was created in a thinned, timber stand seeded with a cool-season forage mixture. Treatment pastures for this study included an open pasture, a thinned pine …
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Effects of Land Disposal of Pulp Mill Effluents on Plant Nutrient Uptake and Element Balance
… has on nutrient uptake and element balance of tree seedlings. Results show that the effluent significantly increased the sodium content of both soil and tissue; however, these levels fell far below the level necessary to become detrimental to plant life, soil chemistry and soil structure. There …
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Fine-Scale Mechanisms Influencing Germination Success, Seedling Growth and Survival in an Alpine Forest-Tundra Ecotone
Despite the expectation that treeline will advance as climate continues to warm, it has only done so in approximately half of all sites studied. One of the explanations for the nonresponse of treelines is based on reproductive limitations including seed production, germination, establishment and …
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The Regeneration Niche in Bottomland Hardwood Forests: Tree and Herbaceous Communities Along Interacting Gradients of Flood and Light in East Texas Floodplains
… canopy gaps in BLH forest support shade-tolerant tree seedlings and increase understory plant diversity, but suppress shade-intolerant hardwoods such as oaks and hickories. A complementary greenhouse study demonstrated that two oak species exhibited similar responses to the experimental imposition …
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Floristic dynamics of Appalachian pine-oak forests over a prescribed fire chronosequence
… was not affected by fire but shade tolerant tree seedlings decreased, and shade intolerant seedlings increased in importance as a result. Percent cover and richness of herbaceous species increased, partly due to the post-fire germination and growth of various forbs and graminoids. Fire did …
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Herbaceous and woody plant establishment across hydrologic gradients in bottomland reforestation sites
… of plant establishment, as well as planted tree survival and growth, in restored floodplain forests. Thus, community assembly in a restored floodplain and, ultimately, restoration outcomes are likely constrained by the site’s hydrologic regime, along with other abiotic factors including …
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Vegetation Responses to Prescribed Burning in a Mixed-conifer Woodland, Cuyamaca Rancho State Park, California
… ha, 85 ha, and 6 ha burn plots were measured for tree and shrub density and basal area 6 months, 1% years, and 2 years following burning for the 3 sites respectively. Each burn site measured was compared against equivalent unburned control plots to help assess the effects of the burning. Density …
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Characterization of Vascular Plant Species Composition and Relative Abundance in Southern Appalachian Mixed-Oak Forests
… of twelve growth form categories. While tree seedlings and perennial herbs dominated, on average, woody vines and fern species represented substantial coverage on sites in the Allegheny Mountains. Correlations among forest strata were weak. The greatest amount of variation in species …
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Ice storms as a disturbance factor in Appalachian oak forests
… the germination and establishment of pioneer seedlings. Survival of these individuals would return the community to an earlier successional stage, or maintain pioneer communities. This study examined the response of the reproduction and susceptibility of tree species (by damage and mortality) …
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Spatial and competitive responses of tree and grass roots to increased nutrients and water in semi-arid African savanna
… previous studies have attempted to explain the tree-grass coexistence through a combination of resource and disturbance based controls. The competitive strengths between herbaceous C₄ grasses and C₃ woody tree seedlings and saplings in the rooting zone are significantly impacted by increased …
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The Influence of Dense Understory Shrubs on the Ecology of Canopy Tree Recruitment in Southern Appalachian Forests
Suppression of canopy tree recruitment beneath rapidly spreading thickets of Rhododendron maximum L. (Ericaceae) in southern Appalachian forests is an issue of major concern because of the potential impacts on forest productivity, hydrology and wildlife habitat. Many studies have investigated the …
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Observations of mycorrhizal inoculation of pin and scarlet oak production in containers
… useful for improving the performance of forest tree seedlings. Commercial mycorrhizal products, many containing the ectomycorrhizal fungus Pisolithus tinctorius (Pers.) Coker and Couch (Pt), have emerged from this research and are now being marketed for landscape tree growers. In this study, two …
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The Influence of Elevated Carbon Dioxide and Water Availability on Herbaceous Weed Development and Planted Loblolly Pine (Pinus taeda) and Coppice Sweetgum (Liquidambar styraciflua) Growth
… and coppiced sweetgum (Liquidambar styraciflua) seedlings were grown in competition with a native weed community using soil and seed bank collected near Appomattox, Virginia. Seedlings and weeds were exposed to CO₂ (ambient and elevated) and water (water stressed and well watered) treatments for …
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Another look at the savannah conundrum : evidence of niche segregation and competition avoidance with grasses in establishing trees
… dominant, but remarkably different life-forms: trees and grasses. However, despite an apparent competitive advantage grasses do not dominate over trees in these systems and this presents a conundrum: how are savannah trees are able to establish in the face of such strong competition from …
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EVALUATING MINE SOIL PREPARED BY SCRAPER PANS FOR HERBACEOUS PLANTS AND PINE SEEDLINGS AT AN EAST TEXAS LIGNITE SURFACE MINE
… LLC (Luminant) has planted over 38.7 million trees on its reclaimed lignite surface mine operations in Texas. For decades, the use of improved reclamation techniques on Luminant’s mined lands have resulted in over 31,160 ha reclaimed to forests, wildlife habitat, and pastures with productivity …
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