Global ETD Search

1	Long term effects of wet site timber harvesting and site preparation on soil properties and loblolly pine (Pinus taeda L.) productivity in the lower Atlantic Coastal Plain Neaves, Charles Mitchell III 22 May 2017 (has links) Short term studies have suggested that ground based timber harvesting on wet sites can alter soil properties and inhibit early survival and growth of seedlings. Persistence of such negative effects may translate to losses in forest productivity over a rotation. During the fall and winter of 1989, numerous salvage logging operations were conducted during high soil moisture conditions on wet pine flats in the lower coastal plain of South Carolina following Hurricane Hugo. A long-term experiment (split-plot within an unbalanced randomized complete block design) allowed assessment of long term effects of rutted and compacted primary skid trails and subsequent site preparation on soil properties and loblolly pine (Pinus taeda L.) productivity. The experiment had 12 blocks, four levels of site preparation as the whole plot factor (bedding, disking with bedding, disking, and no site preparation), and two levels of traffic as the subplot factor (primary skid trail, no obvious traffic). After 23 years, bedding and disking with bedding treatments effectively enhanced soil physical properties and stand productivity via promoting greater survival and stocking, but had little effect on the size of individual trees relative to disking and no site preparation treatments. Primary skid trails significantly reduced the size of individual trees, but had no appreciable long term effects on soil properties or stand productivity after 23 years. The study suggests that bedding is the most efficient practice to enhance soil properties, seedling survival, and stand productivity on wet sites. However, site preparation is not necessary for these soils and sites, if strictly intended to restore soil properties and stand productivity in primary skid trails. Reduction in individual tree sizes on primary skid trails emphasizes benefits in minimizing the spatial extent of disturbance. / Master of Science site preparation skid trails Loblolly pine site productivity soil properties wet site harvesting forested wetlands
2	A native archaeology of the island Hul’qumi’num : Cowichan perception and utililization of wetlands Hill, Genevieve January 2011 (has links) The aim of this research is to develop an understanding of historic Cowichan perception and utilization of wetlands in their traditional territory. The Cowichan live on the south east coast of Vancouver Island on the Northwest Coast of North America, in an area with many wetland features. The story of Cowichan culture history is currently characterized, through archaeological work, as marine oriented. However, archaeological research to date does not represent the full history of the Cowichan people. This research sets out to re-balance the cultural history of the Cowichan, through the qualitative and quantitative analysis of all available sources that identify economic and social orientation in Cowichan culture history, in particular those coming from archaeology, ethnography and oral tradition. As a way of integrating these diverse sources, a ‘Native archaeology’ is developed. This is an approach, which places equal value on etic (cultural outsider) and emic (cultural insider) created sources, and seeks to identify areas of similarity and difference in order that a fuller understanding of the culture may be reached. By applying the Native archaeological approach to Cowichan culture history, the marine orientation is placed in the context of the role of riverine wetlands, which was important both in terms of subsistence and of the symbolic significance that these places have in the self-reflected identity of the Cowichan. In this way, a story is to 971.12
3	Paleoethnobotany of Kilgii Gwaay: a 10,700 year old Ancestral Haida Archaeological Wet Site Cohen, Jenny Micheal 03 December 2014 (has links) This thesis is a case study using paleoethnobotanical analysis of Kilgii Gwaay, a 10,700-year-old wet site in southern Haida Gwaii to explore the use of plants by ancestral Haida. The research investigated questions of early Holocene wood artifact technologies and other plant use before the large-scale arrival of western redcedar (Thuja plicata), a cultural keystone species for Haida in more recent times. The project relied on small-scale excavations and sampling from two main areas of the site: a hearth complex and an activity area at the edge of a paleopond. The archaeobotanical assemblage from these two areas yielded 23 plant taxa representing 14 families in the form of wood, charcoal, seeds, and additional plant macrofossils. A salmonberry and elderberry processing area suggests a seasonal summer occupation. Hemlock wedges and split spruce wood and roots show evidence for wood-splitting technology. The assemblage demonstrates potential for site interpretation based on archaeobotanical remains for the Northwest Coast of North America and highlights the importance of these otherwise relatively unknown plant resources from this early time period. / Graduate / cohenjenny2@gmail.com Kilgii Gwaay paleoethnobotany Haida Gwaii archaeology paleoenvironment archaeobotany plant macrofossils macrobotanical seed identification early Holocene Northwest Coast Pacific Northwest keystone species salmonberry red elderberry Sitka spruce western hemlock western redcedar paleontology Haida culture history split wood technology split spruce root tools berries Gwaii Haanas National Park Reserve wet site

1

Page generated in 0.0658 seconds