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 226 for “"savanna"”.
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Savanna dynamics under extreme conditions
Savannas cover a broad geographical range across continents and are a biome best described by a mix of herbaceous and woody plants. The former create a more or less continuous layer while the latter should be sparse enough to leave an open canopy. What has long intrigued ecologists is how these two …
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Firestorms in a mesic savanna-forest mosaic
Forests and savannas in a savanna-forest mosaic are maintained by positive feedback loops with fires, promoting fires in savannas and excluding fires in forests. Occasional extreme fires do however burn into forest edges and cause extensive mortality. So, while our understanding of bistability in …
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Decomposition of grasses in a South African savanna
Tropical and subtropical grasslands ecologists have ignored decomposition, because of the important role it plays in nutrient cycling, in terms of understanding how grass litter gets to the soil during the dry season. The major flaw is in the methods employed to investigate decomposition. In the …
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The successional dynamics of Acacia nilotica (L.) savanna
Analysis of aerial photographs indicates that woody plant biomass has increased in Hluhluwe Game Reserve, KwaZulu Natal, over a relatively short period. Despite their slow growth rates, Eucleas and other broadleaf species are responsible for the majority of this increase. Nine sites were chosen to …
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Decomposition of grasses in a South African savanna
Tropical and subtropical grasslands ecologists have ignored decomposition, because of the important role it plays in nutrient cycling, in terms of understanding how grass litter gets to the soil during the dry season. The major flaw is in the method~ employed to l investigate decomposition. In the …
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Potential key drivers of thicket expansion in savanna
… grasslands by woody plants and their increase in savannas is a global phenomenon. There has been a lot of work on the ecology of savanna trees, but very little on the drivers of the increase of non-savanna (forest and thicket) vegetation within savannas. The swit9h from savanna to closed canopy …
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Villa Prelat: A Sustainable Dwelling in the Argentine Savanna
… a new home on a tract of land in the Argentine savanna, in a province called Entre Riós. They seek a design for a country home with a horse barn and extensive gardens. This villa will be off the grid and must incorporate sustainable architecture.The design for the Villa Prelat emerged from five …
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Effects of repeated fire on the savanna / forest boundary
Savanna and forest/thicket can exist as alternate stable states, among others, determined by fire ecology feedbacks. Bush encroachment has become an ever-increasing trend converting grassland and savanna biomes to forest/thicket. A severe firestorm occurred in the Hluhluwe-Umfolozi Game Reserve in …
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Perspectives on oak savanna restoration in Minnesota: a dendroecological approach
… disturbances have diminished the extent of oak savannas throughout the Midwest and altered what few remnants remain. Although oak savanna restoration is of great interest to the public and reserve managers, scientists do not fully understand the intricate dynamics of the ecotone, leaving land …
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Effects of hurricanes and fires on southeastern savanna-forest landscapes
… frequent disturbances in southeastern savanna-forest landscapes. Although interactive effects have been proposed, my research is the first to develop and experimentally test mechanistic hypotheses for hurricane-fire interactions. I develop a predictive conceptual model for interacting …
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The influence of rainfall variability on savanna tree seedling establishment
… 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. Instead mortality was highest …
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Limitations of savanna trees in the highveld grasslands of South Africa
… is suppressed. It is puzzling that fire-tolerant savanna trees do not grow in these grasslands. The Highveld grasslands of South Africa are one such grassland. Hypotheses including fire, human intervention, grass competition and various attributes of soil have been proposed to explain the …
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Does tree size matter? : giraffe influence on African savanna ecosystem properties
… 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, such as fire and herbivory. …
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