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.
Results
Showing 1 to 19 of 19 for “"Tree seedling"”.
-
Subalpine Forest Tree Seedling Response to Drought
<p>Knowledge of tree species’ ability to tolerate drought is necessary to anticipate future forest dynamics with climate change, especially at the seedling stage given their role in shaping forest structure. We used precipitation reduction shelters to mimic drought for subalpine conifer seedlings …
-
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 …
-
Effects of Soil Fungi on Tree Seedling Establishment in a Southeastern Coastal Plain Forest
Effects 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 …
-
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 …
-
Effectiveness of Treatments to Reduce Rhododendron maximum and Promote Tree Seedling Regeneration in the Southern Appalachians
… inside of a R. maximum thicket, and 3) canopy tree seedling regeneration. Mechanical cutting treatments were successful in reducing R. maximum basal area per acre; however stump sprouting and increased fuel loading occurred. Herbicide applications were successful in controlling only the …
-
Soil productivity model to assess forest site quality on reclaimed surface mines
… reforestation success is based solely on tree-seedling survival. This method is an estimator of stand density and not an indication of site productivity. There exists a need to evaluate mine soils based on their capability of growing merchantable timber. This model would aid the …
-
Constraints to tree invasion on a nutrient-rich site during old-field succession
… experiments 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, …
-
Longterm Approaches to Assessing Tree Community Responses to Resource Limitation and Climate Variation
… change on forest dynamics will be determined by tree responses at different life-stages and different scales -- from establishment to maturity and from individuals to populations. Studies incorporating local factors, such as natural enemies, competition, or tree physiology, with sufficient …
-
Occupational Biomechanics of Tree-Planters: A study of musculoskeletal symptoms, posture and joint reaction forces in Ontario tree-planters
Tree-planters are likely to suffer from musculoskeletal injuries during their short work season. The objective of this research is to identify the biomechanical mechanisms that contribute to these injuries with an overall goal of reducing injury frequency and severity. Pre- and post-season …
-
Population Dynamics in Response to Fire in <i>Quercus laevis - Pinus palustris</i> Barrens and Related Communities in Southeast Virginia
… mechanical understory removal to that of fire on tree seedling and herbaceous dynamics, and determine the effect of dense lichen (<em>Cladonia spp</em>.) coverage on pine seedling establishment and survival. Fire resulted in 40% aboveground mortality in the overstory, 80% in the sapling/large …
-
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 …
-
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 …
-
Grass root gaps : an establishment bottleneck limits trees in savannas and excludes them in South Africa's highveld grasslands
… Africa are climatically capable of supporting trees, yet no trees occur. The fact that no fire adapted savanna trees occur in these grasslands confounds the suggestion that fires maintain these ecosystems. This study addresses the question of what prevents savanna trees from surviving. It was …
-
Regeneration of fire-adapted species in the Sierra Nevada contingent upon repeated fuel treatments and available soil moisture
… understanding of how treatments may influence tree seedling communities and shape stand trajectories over time, yet this remains a critical knowledge gap in forest management. Here, we leveraged a long-term study of repeated fuel treatments in the Sierra Nevada mixed-conifer forest type to …
-
Landscape-Scale Variability in the Composition, Growth and Pattern of Alpine Treeline Vegetation
… to climate warming, particularly across the treeline ecotone. However, responses to warming in the past century have been highly variable, especially in regions with complex topography. In order to improve predictions of future change, I used field surveys, dendrochronology, and remote …
-
USING THE FORESTRY RECLAMATION APPROACH FOR RECLAIMED SURFACE MINELAND IN THE WESTERN GULF: EFFECTS ON PINUS TAEDA SEEDLING GROWTH AND SURVIVAL
… loblolly pine (<em>Pinus </em><em>taeda </em>L.) seedlings of a western Gulf provenance were hand-planted. Soil chemical and physical parameters were assessed on each treatment to determine the effect the FRA and scraper method had on resulting tree seedling growth and survival.</p> <p>After three …
-
Reclamation of surface-mined forest land in the southern Appalachians
… creates a productive forest soil. Surveys of tree plantings on land that was mined prior to enactment of the 1977 Surface Mining Control and Reclamation Act (SMCRA) have shown that trees will grow well where 1) minesoils are non-toxic, 2) minesoils are deep, loose, and uncompacted, and 3) tree …
-
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, …
-
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. …