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Creator:: Shemwetta, Dunstan T. K.
Abstract:: Plantation forests on mountainous areas in Tanzania, East Africa, were successfully established in the 1950's. Harvesting started in the 1970's to meet increased national timber demand. Current problems of unharvested areas and potential environmental degradation are associated with uncontrolled harvests, mismatch of harvest systems to site needs, and post-harvest practices....
Resource Type:: Dissertation

Creator:: Leuthold, Niels C.
Abstract:: In the Pacific Northwest, multiple studies have found negative effects of timber harvest on stream amphibians, but the results have been highly variable and region-specific. In this collection of studies, I examined the short term effect of timber harvest using a field study, and used lab work to examine a...
Resource Type:: Dissertation
Full Text:: . Abstract approved: John P. Hayes Michael J. Adams

Creator:: Hillyer, Charles C.
Abstract:: Many regions in North America are experiencing water shortages, and these conditions are expected to worsen. The next generation of irrigation scheduling applications must therefore be capable of providing operational advice in support of deficit irrigation strategies. However, the theoretical, technical, and practical challenges associated with deficit irrigation scheduling are...
Resource Type:: Dissertation
Full Text:: _____________________________ Marshall J. English John P. Bolte Many regions in North America are experiencing water

Creator:: Sayde, Chadi
Abstract:: Achieving and maintaining sustainability in irrigated agriculture production in the era of rapidly increasing stress on our natural resources require, among other essential actions, optimum control and management of the applied water. Thus, a significant upgrade of the currently available soil water monitoring technologies is needed. The primary goal of...
Resource Type:: Dissertation
Full Text:: Marshall J. English John S. Selker Achieving and

Creator:: Hu, Yueh-Ying Sun
Resource Type:: Dissertation
Full Text:: John J. Wittkopl' for his encouragement, advice and direction during the progress of this work. She

Creator:: Maher, Anna T.
Abstract:: Resilience-based management in rangelands implies maintaining desirable ecological states and avoiding thresholds to less desirable ones; however, the efficacy of resilience-based management depends upon several driving forces. These forces include management by those who depend upon rangelands for their livelihoods, the current state of ecological health of rangelands, and changing...
Resource Type:: Dissertation
Full Text:: : ______________________________________________________________________ Heidi J. Albers John A. Tanaka Resilience-based management in rangelands implies

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