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 13 of 13 for “"herbaceous understory"”.
-
Characterization of Sites for Native Herbaceous Understory Restoration in West Gulf Coast Longleaf Pine (Pinus palustris) Savannas
… parts of western and central Louisiana. Native understory species have since been removed or reduced by exotic plants that were introduced and from the reduction in the frequency of both wild and prescribed fires. A diverse layer of understory species can still be seen today, but not often in …
-
Characterization of Sites for Native Herbaceous Understory Restoration in West Gulf Coast Longleaf Pine (Pinus palustris) Savannas
… parts of western and central Louisiana. Native understory species have since been removed or reduced by exotic plants that were introduced and from the reduction in the frequency of both wild and prescribed fires. A diverse layer of understory species can still be seen today, but not often in …
-
Herbaceous and woody plant establishment across hydrologic gradients in bottomland reforestation sites
… importance of abiotic factors on tree and herbaceous species establishment and growth, and there is a need for improved tools for identifying critical abiotic factors during pre-restoration planning. In order to determine the effect of hydrology and other abiotic conditions on plant …
-
Predicting forest cover types in Southwestern Virginia using topographic information
… and SAF forest type predictions (P > 0.25). Herbaceous understory was sampled on the basis of cover, and mast production was estimated in each of the forest types. Forest types on sites had significantly greater amounts of forb and fern cover than those on drier sites. Production of grasses …
-
Does tree size matter? : giraffe influence on African savanna ecosystem properties
… single stratum system. It is known that the herbaceous understory of Savanna ecosystems is most productive at intermediate tree density, where the shade and nutrients from the tree are more influential than the competition with the tree. Tree density varies in savannas due to disturbances, …
-
Biological control of the invasive Ailanthus altissima (tree-of-heaven) in Virginia using naturally occurring Verticillium wilt fungi
… of native plants and species in the woody and herbaceous understory, but not the germinable seedbank. Furthermore, we found that this impact on the woody understory appears to increase over time, supporting early management actions and helping us predict post-management restoration needs. We …
-
Vegetation response of a Wyoming big sagebrush (Artemisia tridentata ssp. wyomingensis) community to 6 mechanical treatments in Rich County, Utah
… has been recognized. The historical removal of herbaceous species by excessive and uncontrolled livestock grazing on many of our sagebrush ecosystems has resulted in a stagnant state where dense, competitive stands of sagebrush prevent herbaceous species from recovering. Most early research on …
-
Water balance and productivity of a Mediterranean oak woodland : Quantifying understory vegetation impacts by development of a stable oxygen isotope partitioning approach
… woodland. Special focus was laid on the seasonal understory impact on net ecosystem fluxes, soil water distribution and tree-understory interactions. Moreover, the impact of altered precipitation pattern and drought intensity on ecosystem functioning was assessed, as these phenomena are predicted …
-
Effects of paper mill sludge on tree growth and competition in young red pine plantations
… of Carex spp. (sedge), the predominant herbaceous understory component, showed increasing foliar N levels with sludge application 21 months following treatment in above-ground tissue, with a corresponding increase in above-ground biomass relative to controls of 22%, 33% and 85% among the …
-
Life History and Demography of Trillium ovatum Pursh. (Liliaceae)in Western Montana
… face many of the same threats as other forest understory species—logging, overharvest for horticultural/medicinal use, competition from nonnative species, and overgrazing. Low fecundity and recruitment may limit the ability of these populations to recover from stress or mortality events, and …
-
Life History and Demography of Trillium ovatum Pursh. (Liliaceae)in Western Montana
… face many of the same threats as other forest understory species—logging, overharvest for horticultural/medicinal use, competition from nonnative species, and overgrazing. Low fecundity and recruitment may limit the ability of these populations to recover from stress or mortality events, and …
-
Effects of Forest Regeneration Methods on Salamander Populations in Central Appalachia
… habitats or that described the overstory and understory of forest stands. At the scale of the 30 m2 transect and the 10 m2 sub-transect, abundance of salamanders was best described by models that incorporated descriptors of canopy cover and woody and herbaceous understory vegetation. Thus, …
-
Greater Sage-grouse habitat and demographic response to grazing by non-native ungulates
… at high rates, we detected a decline in the herbaceous understory and increases in the amount of bare ground, regardless of whether the site was a random site, or if it was a site chosen to nest or brood their chicks. We observed similar trends at available sites when feral horses were …