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Dissertations / Theses on the topic 'Woody plant encroachment'

Author: Grafiati

Published: 4 June 2021

Last updated: 19 February 2022

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1

Buono, Jared. "Assessing the Ecohydrologic Consequences of Woody Plant Encroachment." Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/195347.

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This three part study attempted to enhance our understanding of vegetation change and its potential effects on ecohydrology in drylands. The first study developed a method to measure the velocity of shallow overland flow. Under rainfall simulation, dye tracers were applied to runoff and photographed to calculate mean surface velocity. Results showed this approach was a significant improvement explaining 13% more of the variation in mean velocity compared to traditional methods. Results from the first study were used to compare hydraulic parameters on shrub- and grass-dominated plots in the se

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2

Gray, Emma Fiona. "Some consequences of woody plant encroachment in a mesic South African savanna." Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/10563.

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This study investigates the diversity present in the patch mosaic of vegetation, and also investigates how woody plant encroachment is affecting ecosystem services in Hluhluwe Game Reserve, with a focus on biodiversity, carbon storage and recreation and tourism.

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3

Rajala, Kiandra F. "Ecosystem Transformation Across a Changing Social Landscape: Landowner Perceptions and Responses to Woody Plant Encroachment." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/86724.

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The conversion of grasslands to woodlands is an ecosystem transformation that threatens grassland biodiversity, the provision of important ecosystem services, and the sustainability of rural livelihoods. A global phenomenon, woody plant encroachment (WPE) has been particularly problematic in the Southern Great Plains of the United States where the actions of private landowners are integral to sustaining grasslands. Increased diversity in landowners’ motivations for owning land have shifted the social landscape of rural areas necessitating a better understanding of landowners’ perspectives abou

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4

Skowno, Andrew Luke. "Woody plant encroachment in arid and mesic South African savanna-grasslands: same picture, different story?" Thesis, Rhodes University, 2018. http://hdl.handle.net/10962/62603.

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Woody plant encroachment in South Africa’s savanna-grasslands has been considered a rangeland management problem since the early 1900s. This phenomenon, which has been observed globally, is particularly important in Africa given the extent of tropical grassy biomes on the continent and their importance for rural livelihoods. In this study, local and regional scale approaches were used to investigate woody cover change in South Africa across the important savanna-grassland rainfall threshold of 650 mm mean annual precipitation (MAP). The aim was to test this threshold using remote sensing and d

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5

Barron-Gafford, Greg Alan. "TEMPERATURE AND PRECIPITATION CONTROLS OVER SOIL, LEAF AND ECOSYSTEM LEVEL CO2 FLUX ALONG A WOODY PLANT ENCROACHMENT GRADIENT." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/193976.

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Woody plant encroachment (WPE) into historic grasslands not only alters ecosystem structure but also yields a mosaic of vegetative growth-forms that differ in their inherent physiological capacities and physical attributes. C₃ plants tend to have a relatively broad range of temperature function but at the expensive of a lower optimum rate of photosynthesis. In contrast, C₄ grasses have a greater capacity for maximum uptake but across a relatively narrow range of temperatures. In considering which of these functional groups will outcompete the other within these regions undergoing WPE, one must

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6

Browning, Dawn M. "Woody Plant Dynamics in a Sonoran Desert Ecosystem across Scales: Remote Sensing and Field Perspectives." Diss., The University of Arizona, 2008. http://hdl.handle.net/10150/195333.

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Historic land uses impose discernable legacy effects that may influence ecosystem function, a concern of particular importance in actively managed landscapes. In recent history (ca. 150 years) tree and shrub abundance has increased at the expense of native grasses in savannas and grasslands. The magnitude and patterns of change are spatially heterogeneous, highlighting the need for analytical approaches spanning multiple spatial scales, from individual plants to patches to landscapes. The overarching goal of this dissertation was to explore long-term dynamics associated with woody plant encr

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7

McKinley, Duncan Crannell. "Consequences of conversion of native Mesic grassland to coniferous forest on soil processes and ecosystem C and N storage." Diss., Manhattan, Kan. : Kansas State University, 2006. http://hdl.handle.net/2097/253.

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8

Amat, Martínez Beatriz. "Dynamics of woody vegetation patches in semiarid ecosystems in the southeast of Iberian Peninsula." Doctoral thesis, Universidad de Alicante, 2015. http://hdl.handle.net/10045/50210.

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9

Madsen, Matthew D. "Influence of Soil Water Repellency on Post-fire Revegetation Success and Management Techniques to Improve Establishment of Desired Species." BYU ScholarsArchive, 2009. https://scholarsarchive.byu.edu/etd/1994.

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The influence of soil water repellency (WR) on vegetation recovery after a fire is poorly understood. This dissertation presents strategies to broaden opportunities for enhanced post-fire rangeland restoration and monitoring of burned piñon and juniper (P-J) woodlands by: 1) mapping the extent and severity of critical and subcritical WR, 2) determining the influence of WR on soil ecohydrologic properties and revegetation success, and 3) evaluating the suitability of a wetting agent composed of alkylpolyglycoside-ethylene oxide/propylene oxide block copolymers as a post-fire restoration tool fo

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10

Britz, Mari-Louise. "The effects of soil type and management strategy on vegetation structure and function in a semi-arid savanna, South Africa." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/53768.

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Thesis (MSc)--Stellenbosch University, 2004.<br>ENGLISH ABSTRACT: Bush encroachment in savannas leads to reduced diversity, productivity and profitability of rangelands. This holds important implications for the livestock and eco-tourism industries, as well as for subsistence ranchers in the South African semi-arid savannas, who depend on this vegetation type for economic and livelihood purposes. Soil moisture, nutrients, rue and herbivory are generally regarded as the principal factors determining vegetation structure and function within savannas. The factors and processes involved in t

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11

González, Ana Verónica. "Dynamics of woody plant encroachment in Texas savannas : density dependence, environmental heterogeneity, and spatial patterns." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-08-1887.

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Woody plant encroachment, that is, a substantial increase in the abundance of woody plants in a grassland or savanna, occurs in many parts of the world. It often has large effects on plant and animal populations and communities and on ecosystem properties and processes. However, little is known about the dynamics of woody plant encroachment and how these are affected by soils, by topography, and by the spatial pattern of the vegetation. Encroachment in turn can affect the spatial pattern of the vegetation. Using data from historical aerial photographs, I measured changes in woody plant cov

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12

Kantola, Ilsa Beth. "Biogeochemistry of Woody Plant Invasion: Phosphorus Cycling and Microbial Community Composition." Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-11030.

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Woody plant encroachment is a globally-prevalent vegetation change phenomenon that has shifted grass-dominated ecosystems to mixed grass and woody plant matrices over the last century. In the Rio Grande Plains of Texas, the introduction of N-fixing woody legumes has increased above- and belowground primary productivity and changed the litter chemistry of the system, accelerating rates of belowground biogeochemical processes. The purpose of this study was to assess the impact of grassland to woodland transition on i) P concentrations in soil physical fractions that differ in their organic mat

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13

"Exploring the Ecohydrological Impacts of Woody Plant Encroachment in Paired Watersheds of the Sonoran Desert, Arizona." Master's thesis, 2013. http://hdl.handle.net/2286/R.I.17900.

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abstract: Woody plant encroachment is a worldwide phenomenon linked to water availability in semiarid systems. Nevertheless, the implications of woody plant encroachment on the hydrologic cycle are poorly understood, especially at the catchment scale. This study takes place in a pair of small semiarid rangeland undergoing the encroachment of Prosopis velutina Woot., or velvet mesquite tree. The similarly-sized basins are in close proximity, leading to equivalent meteorological and soil conditions. One basin was treated for mesquite in 1974, while the other represents the encroachment process.

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14

Alofs, Karen Marie. "The effects of habitat loss and fragmentation caused by woody plant encroachment on native plant diversity and on an invasive grass." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-05-1464.

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Habitat loss, habitat fragmentation and species invasions have been recognized as three of the leading threats to biodiversity. I examined the effects of habitat loss and fragmentation on native and invasive plants in central Texas. During the last century, the density and abundance of woody plants has been increasing in the savannas of eastern Edwards Plateau. This process, known as woody plant encroachment, not only reduces the amount of open herbaceous habitat but also fragments that habitat creating smaller and more isolated patches. In three studies, I investigated the consequences of thi

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15

Mashapa, Rebone Euthine. "Woody plant encroachment effects on the hydrological properties of two contrasting soil types in Bela-Bela, Limpopo Province." Thesis, 2021. http://hdl.handle.net/10386/3480.

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Thesis (M.Sc. Agriculture (Soil Science)) -- University of Limpopo, 2021<br>Woody plant encroachment results in the degradation of grasslands. It is defined here as the increase in density, cover and biomass of woody plants into formerly open grasslands, reducing grassland productivity. Globally, many arid and semi-arid savanna grasslands are affected by this land cover transformation which changes the vegetation structure by altering the ratio of woody plants relative to grass species and influences soil hydrology. In the existing literature there is limited information on the eff

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16

Gonzalez-Roglich, Mariano. "Spatio-temporal dynamics of woody plant-cover in Argentine savannas: encroachment, agriculture conversion and changes in carbon stocks at varying scales." Diss., 2015. http://hdl.handle.net/10161/9854.

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<p>Land use and land cover changes significantly affect C storage in terrestrial ecosystems. Programs intended to compensate land owners for the maintenance or enhancement to C stocks are promising, but require detailed and spatially explicit C distribution estimates to monitor the effectiveness of management interventions. Savanna ecosystems are significant components of the global C cycle, however, they have not received much attention for the development of C monitoring approaches. In this dissertation I have investigated three of the aspects related to woody plant cover dynamics in semiari

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17

Monegi, Piet. "Effects of nutrient-tannin interactions on intake and germination of woody plant species by ruminants." Diss., 2017. http://hdl.handle.net/10500/22831.

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Woody plant encroachment is one of the major problems worldwide because it affects negatively the herbaceous layer, which provide forage for livestock production. However, the role of ruminants particularly browsers in the dispersal of woody plant seeds still remains a concern for farmers interested in grass production. Seedpods of various woody plant species constitute a crucial part of the diet of herbivores during the dry season because of their high nutritional quality compared to herbaceous material. The interaction of associated diet quality, seed characteristics and animal species among

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18

Gordijn, Paul Jan. "The role of fire in bush encroachment in Ithala Game Reserve." Thesis, 2010. http://hdl.handle.net/10413/10776.

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The increase of woody vegetation (also known as bush or shrub encroachment) in savannas has become of global concern to conservationists and rangeland managers alike. Bush encroachment has been associated with a decrease in rageland palatability. In addition, the increase in woody biomass has consequences for climate change, carbon sequestration, rangeland hydrology and nutrient cycling. As a result of these large changes in ecosystem functioning with bush encroachment, biodiversity may be threatened. Fire is considered to be one of the most important management tools used to control woody bio

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19

Hollister, Emily Brooke. "Land use and land cover change: the effects of woody plant encroachment and prescribed fire on biodiversity and ecosystem carbon dynamics in a southern great plains mixed grass savanna." 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2780.

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In the southern Great Plains, the encroachment of grassland ecosystems by mesquite (Prosopis glandulosa), is widespread, and prescribed fire is commonly used in its control. Despite this, substantial quantitative information concerning their influences on the community composition, functional dynamics, and soil organic carbon (SOC) storage potential of grassland ecosystems is lacking. The objectives of this study were to: a) quantify the effects of seasonal prescribed fire treatments and mesquite encroachment on aboveground net primary productivity (ANPP) and herbaceous community composition;

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20

Mokoka, Malesela Vincent. "Impact of rainfall on the determination of tree age and establishment patterns of acacia tortilis in the Limpopo Province, South Africa." Thesis, 2016. http://hdl.handle.net/10386/1691.

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Thesis (MSc. Agriculture (Pasture Science)) -- University of Limpopo, 2016.<br>The relationships between tree age, growth rings, and stem circumference correlated with establishment patterns may be a valuable instrument to reveal the functioning of woody species in the Savanna Biome. A study on tree age and establishment patterns of Acacia tortilis in the semi-arid regions of the Limpopo Province was conducted to aid an understanding of the causes of encroachment in savanna vegetation. This study aimed to determine the periodicity of growth ring formation at two study areas, correlate the nu

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