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 20 of 31 for “"soil seed bank"”.
-
Land Use and Topography Impacts on Rangeland Soil Seed Bank Composition on Standing Rock Indian Reservation
… Rock Indian Reservation by utilizing the seeds stored naturally in the soil seed bank. The objectives of this study were: 1) to determine if the composition of the soil seed bank in native prairie rangeland grazed historically by bison differs from the composition of the soil seed bank in …
-
Role of seed mixes, biochar soil amendment, and the soil seed bank in improving Palouse Prairie restoration
… the most effective restoration approach. Annual seeds and soil organic matter are important for succession and soil moisture, but their roles are unknown for Palouse prairie restoration. Additionally, the soil seedbank of the Palouse ecoregion is widely unknown but could provide insight into …
-
Riparian vegetation and the soil seed bank five years after dam removal on the Elwha River, Washington
… large dams on the Elwha, and 2) examine how the soil seed bank relates to riparian landforms and location above and below the former dam sites. To do this I surveyed plant species richness, community composition, and soil seed bank species richness and seed abundance on three riparian landforms …
-
Effect of land degradation on the above-ground vegetation and soil seed bank of a Rangeland in Kunene region Namibia
… is affecting above ground vegetation and seed bank composition, hindering their recovery. To address this issue, it is crucial to assess land conditions at different levels and develop effective strategies for restoring degraded rangeland. The understanding of how land degradation impacts …
-
The soil seed bank in Agathis australis (D. Don) Lindl. (kauri) forests of northern New Zealand and its potential role in secondary successions
The soil seed bank in Agathis australis (D. Don) Lindl. (kauri) forests of northern New Zealand is quantified, and its potential role in secondary successions examined. Seed bank data from a number of kauri forest sites stratified by successional time and distance from forest edges are summarized …
-
Tillage effects on soil physical properties, weed seed distribution in soil and shifts in species
… a study on how long-term tillage systems affect soil strength, bulk density, soil water characteristics, weed seed distribution in soil, and shifts in species. The experiment included a corn-soybean rotation with both crop grown each year. For this study, only the corn crop was considered. The …
-
Conserving living landscapes: investigating the impacts of livestock grazing and assessing rangeland restoration potential in Overberg Renosterveld, South Africa
… namely cattle and sheep, on biodiversity, the soil seed bank, and the restoration potential of renosterveld vegetation from resting the veld. The effect of livestock grazing by sheep and cattle on plant species richness and diversity and growth form diversity was assessed using Modified …
-
Resilience and recovery of plant communities facing increasing fire severity
… focused on recovery through recruitment from the soil seed bank. By establishing a greenhouse experiment, I observed how increasing fire severity reduced diversity in the soil seed bank. My fourth study examined post-fire recovery through seed dispersal. I monitored seed rain through collection …
-
Linking mechanism to pattern in community assembly: Ant-mediated seed dispersal in neotropical pioneer tree species
… demography, and reproduction. Ant-mediated seed dispersal has evolved multiple times in many biogeographical locations. Most research in this area has focused on myrmecochorous plants that are known to elicit seed dispersal by providing a specialized lipid rich food reward called an …
-
Bird perches and soil amendments as revegetation techniques for landslides in Puerto Rico
… in tropical rainforests. The loss 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 …
-
Fecundity of Larrea tridentata and Ambrosia dumosa across a spatially heterogeneous Mojave Desert landscape
Seed dynamics of Larrea tridentata and Ambrosia dumosa were measured for two consecutive years (2000--2001) in microhabitats under adult Larrea, under adult Ambrosia, under non-Larrea/Ambrosia shrubs, in barren open areas, and in open areas with >50% microphytic crust cover. Microhabitat …
-
THE FEASIBILITY OF CHAPARRAL RESTORATION ON TYPE-CONVERTED SLOPES
… annual grasses; (2) compare the success of seeding or planting native seedlings as a means of restoration; (3) analyze the soil seed bank to determine if there was a relict native species seed bank on site; (4) test the field application of smoke-water as a technique to manipulate the soil’s …
-
Control and Fecundity of Palmer Amaranth (Amaranthus palmeri) and Common Ragweed (Ambrosia artemisiifolia) from Soybean Herbicides Applied at Various Growth and Development Stages
… dicamba, 2,4-D, or glufosinate alone). Seed production of 5 to 10 cm Palmer amaranth and common ragweed was reduced greater than 76% by fomesafen, auxin (dicamba and 2,4-D), or glufosinate containing treatments. Some weeds survived and set seed even when treated at the proper size. As …
-
Response of riparian plant communities to hydrological alteration: Are seed banks a means of restoration?
… on in situ plant community composition and seed bank composition were examined at five riparian sites in the Yazoo River watershed in northern Mississippi. This analysis was performed to determine if the soil seed bank can provide a means for the restoration of riparian floodplain plant …
-
Botanical processes in urban derelict spaces
… Experimental work included vegetation surveys, soil seed bank investigation, field mapping and seed rain trapping methods. Interpretation of the data involved a range of approaches including vegetation classification and ordination, comparative analysis of plant functional attributes and the …
-
Seed and seedling ecology of two co-occurring ericoid fynbos shrub species
The seed and seedling ecology of the ericoid fynbos shrubs Passerina paleacea and Phylica ericoides were studied. These species co-occur in dune fynbos and are dependent on soil seed banks for regeneration after recurrent fynbos fires. Phylica was stimulated by the heat effect of fire. The precise …
-
Climatic and hydrologic processes leading to recent wetland losses in Yellowstone National Park, USA
… I integrated analyses of hydrology, climate, soils, and vegetation. In 2009 I selected 24 study wetlands and instrumented each with an average of five shallow groundwater monitoring well-and-piezometer nests. To quantify historic wetland area I mapped hydric soils, analyzed aerial photographs, …
-
Life history strategies in variable environments: Demography, delayed germination and bet-hedging in a desert annual Plantago
… permanent quadrats and repeatedly sampling the soil seed bank. A fraction of seeds in all populations delayed germination and formed a persistent seed bank. Populations with more among-year variation in precipitation had greater variability in reproductive success for germinated seedlings, and …
Page 1 of 2