Land use and land use change strongly influence the carbon (C) dynamics within ecosystems. This study quantified four aspects of land use and land use change effects: 1) ecosystem C stocks and distribution; 2) soil respiration; 3) soil C mineralization; and 4) net ecosystem productivity. Land use systems studied include agriculture (AG), 2-yr- and 9-yr-old hybrid poplar plantations (2HP and 9HP, respectively), grassland (GRA), and native forest stand (NAT). Ecosystem C stock in NAT (223 Mg C ha-1) was similar to 9HP (174 Mg C ha-1) and both were significantly greater than AG (122 Mg C ha-1), GRA (121 Mg C ha-1), and 2HP (110 Mg C ha-1). Cumulative soil C loss via soil respiration averaged over two growing seasons was in the order of: NAT (7.810.40 Mg C ha-1) > 9HP (5.510.31 Mg C ha-1) > GRA (5.230.30 Mg C ha-1) > AG (5.020.24 Mg C ha 1) > 2HP (4.280.20 Mg C ha-1). Depending on land use, seasonal heterotrophic and autotrophic respiration had respective contributions to soil respiration of up to 35 and 83%. Soil C mineralization of bulk soil across the land uses ranged between 2 to 5% of initial total organic C (Ci), with mineralization rates ranging from 0.06 to 0.12 g C mg-1 Ci d-1 and mean residence times ranging from 30 to 51 yrs. Across particle size fractions, soil C mineralization was in the order of: AG > HPs > GRA > NAT of which the coarse fractions, representing labile C, were the main source of mineralized C (79%). Mineralization increased when NAT was converted to AG; and decreased when AG was converted to HP or GRA. Net ecosystem productivity across land uses, expressed in terms of C, ranged between 2 (AG) and 11 Mg C ha-1 yr-1 (older HP). Conversion from AG to GRA increased net ecosystem productivity three-fold. When AG was converted to HP, the plantation was a C source in the first four years and became a C sink by year five. Results obtained from this study are relevant to modeling efforts designed at determining the impact of future climate change on a variety of land uses. / Soil Science

<p>This thesis investigates land reform coverage at the time of the land summit through quantitative and qualitative content analysis. Hard news reports, editorials and opinion pieces that appeared in the daily newspapers Beeld, Business day, Sowetan and Sunday newspapers Rapport and Sunday Times between July and September 2005 were analysed in terms of what they reported , issues that received little attention, portrayal of certain issues and sources used. The findings were used to make inference about the degree to which the newspapers in the study fulfill their societal roles.</p>

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Land Incorporated is a practice-based investigation into the relation between the land, the body and its representation. The textural and haptic nature of light, philosophical notions of reflection and the embodied and phenomenological experience of movement through the landscape are explored via mediums of incised paper, etched mirror and line drawing. Studies in philosophy, film theory and anthropology into the structure of vision in space, the touch of the eye upon an object and the haptic nature of the mark that in-scribes a surface, have illuminated bodily perceptual relationships to the land and informed an understanding of 'inscription' that incorporates mobile narratives of the artist and the viewer.

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Thesis (M.S.)--Virginia Polytechnic Institute, 1968. / Also available via the Internet.

Thesis (M.L. Arch. - Landscape Architecture)--University of Arizona, 1982. / Includes bibliographical references (leaves 62-68).