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Thesis (Ph. D.)--Institute of Paper Chemistry, 1954. / Includes bibliographical references (p. 95-109).

Thesis (Ph. D.)--Institute of Paper Chemistry, 1957. / Includes bibliographical references (p. 96-98).

Thesis (Ph. D.)--Institute of Paper Chemistry, 1952. / Includes bibliographical references (p. 154-157).

Thesis (Ph. D.)--Institute of Paper Chemistry, 1969. / Includes bibliographical references (p. 117-120).

Thesis (Ph. D.)--Institute of Paper Chemistry, 1943. / Bibliography: leaves 69-72.

The response of geomorphic systems to disturbance has been a major focus of geographic research. Nevertheless, because the sensitivity of geomorphic systems to external perturbation is complex, the response of those systems is still poorly understood for many agricultural systems in various geographic settings. This study investigates geomorphic sensitivity and soil erosion under traditional slash-and-burn cultivation. The response of soil erosion to this agricultural practice was investigated in selected plots at different stages of cultivation, representing a chronosequence of slash-and-burn cultivation for the study site. Selected physical and hydrological properties were measured in the field or determined in the laboratory from soil samples obtained from the selected plots. Soil erosion was monitored for the selected plots using bounded runoff plots. Finally, the response of soil erosion to slash-and- burn was assessed at the watershed scale by adapting the Revised Universal Soil Loss Equation to local field conditions. The study results showed that soil’s selected physical and hydrological properties differed according to the age of cultivation. In general, soil properties, such as organic matter, aggregate stability, and infiltration, showed signs of deterioration during the cultivation phase and improvement during the fallow stage of slash-and-burn cultivation. These differences in turn resulted in differences in the erodibility of the soil and the response of soil erosion at the plot scale. The soil erosion rate was observed to be higher during the cultivation stage of slash-and-burn cultivation and lower during the fallow stage. The lowest rate of erosion was recorded in natural forest plots. Overall, soil erosion rates were low considering the study site’s mountainous nature. The results of this study suggest that the response of soil erosion under the practice of slash-and burn cultivation could be minimal in a potentially sensitive humid tropical mountainous environment depending on the specific cover produced, the environmental factors, and the specific cultural management, such as cropping and tilling practices. Maintaining adequate ground cover through cropping and fallow management is the key to keeping soil erosion minimal under the practice of slash-and-burn cultivation in the study area. / text

Revised; Originally Published 2002 / 4 pp. / Pine bark beetles in Arizona are generally of the genus Ips or Dendroctonus. Fading foliage in the tree is often the first sign of a beetle attack. Prevention is best practiced since control is not possible once the beetles have successfully colonized the tree. Colonization is dependent upon trees being in a vulnerable condition caused by stress from various agents and site conditions.

Managed pine forests are central to the economic vitality of the southeastern US. Over the past fifty years, the productivity of managed pine forests of this region have increased significantly with the development of new silvicultural technologies and the use of improved tree genetic material. Of the pine species present in the southeastern US, loblolly pine has arguably been the most intensively studied and widely planted by forest managers. Efficient operational deployment of improved genetic materials requires an understanding of how possible site conditions and silvicultural treatment may interact to affect maximum yield. There are a wide range of site conditions in the south as the result of regional climate gradients, soil type and soil drainage patterns. On the western edge of loblolly pine’s natural extent, Texas has a drier climate than areas to the east, and in Louisiana, there are also poorly drained Ultisols that are found in areas with little relief and are prone to flooding. However, on the basis of 10-year forest inventory data of pure-family plots from three different sites and under two levels of cultural regime intensity, my study found that superior genotype, Lob 5 from South Carolina, still showed best performance in the Western Gulf area, and high intensive treatment could improve stand growth and resistance to wind damage significantly. Further, my study compared the stand production and dynamics between pure- and mixed-family plots. I found that Lob 5 and Lob 4 showed the growth traits of competitive ideotype, and low intensive treatment increased the deployment effect significantly for competitive ideotype. Finally, my study examined leaf area index (LAI) and foliar nitrogen concentration (foliar N). The result showed that fast growing genotype had lower LAI and foliar N than slow growing one. It indicated that fast growing genotype had high resource use efficiency and nutrient requirement. This research provided critical information to guide industrial forest management in the WG (Western Gulf) area. First, introduced superior genotype continued to show good performance in this area. Second, combination of good genotype and high intensive treatment would increase plantation production significantly. Third, identification of ideotype would increase the accuracy of growth potential estimation in progeny test.

Uppsatsens avsikt är att göra en värdegrundsanalys av tre skönlitterära verk som återfinns på högstadiet i klassrumsuppsättning. De verk som jag har läst är Ondskan av Jan Guillou, Ida slash Sandor av Sara Kadefors och Flugornas herre av William Golding. Utifrån ett värdegrundsperspektiv med utgångspunkt i Lgr 11 ska jag se hur begreppen demokrati, människolivets okränkbarhet, individens frihet och integritet, alla människors lika värde, jämställdhet mellan kvinnor och män samt solidaritet med svaga och utsatta synliggörs i verken. Uppsatsen har en kvalitativ ansats och metoden som använts är kvalitativ textanalys. Till uppsatsens bakgrund har lämplig forskning om begreppet värdegrund tillfogats samt hur denna kan tydliggöras i skolan. Resultatet består av en litteraturvetenskaplig textanalys och diskussion med stöd av relevant litteratur. Slutsatsen är att samtliga verk kan försvara sin plats i skolans litteraturläsning ur ett värdegrundsperspektiv eftersom diskussioner om innehållet alltid kan tillföra insikter, även om författarens intention inte är att skapa ett underlag för värdegrundsfrågor.