Thesis (M.S.)--Oregon State University, 1978. / Typescript (photocopy). Includes bibliographical references. Also available on the World Wide Web.

Thesis (M.S.)--University of Wisconsin--Madison, 1982. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 29-32).

Thesis (Ph. D.)--Oregon State University, 1983. / Typescript (photocopy). Includes bibliographical references (leaves 202-218). Also available on the World Wide Web.

Thesis (Ph. D.)--Oregon State University, 1992. / Typescript (photocopy). Includes bibliographical references (leaves 122-125). Also available on the World Wide Web.

Thesis (Ph. D.)--Oregon State University, 1999. / Typescript (photocopy). Includes bibliographical references. Also available on the World Wide Web.

This study was undertaken to compare the overstory above-ground biomass, net primary production, and nutrient cycle in three common types of subalpine coastal forests near Vancouver, B.C. Canada. Twelve sample plots, representing three plant associations of different moisture regime, were established along an elevation transect. The following parameters were determined on each plot: overstory litterfall biomass and its macronutrient content, overstory throughfall volume and its macronutrient content, above-ground tree biomass and its macronutrient content, tree bole wood increment, annual net primary production and its macronutrient content, mean depth of forest floor and its biomass. The quantity of macronutrients supplied in incident precipitation was measured in three forest openings in the vicinity of the sample plots. Litterfall was sampled for 24 months, while throughfall and incident precipitation were sampled during the summers of three consecutive years. Diameter increment for the last 20 years was measured on increment cores obtained from 95 randomly selected trees. Increment of tree boles was calculated from allometric volume equations and combined with data on litter production to provide the estimate of net primary production. Distribution of biomass and macronutrients in the above-ground tree layer was calculated by logarithmic equations prepared in a preliminary study. Sample plots ranged in elevation from 1250 to 1450 m. Tree cover consisted of mountain hemlock and Pacific silver fir in various proportions with some yellow-cedar at the top and some western hemlock at the bottom of the elevation transect. Mean age of trees on the sample plots ranged from 295 to 440 years. The above-ground tree standing biomass on the sample plots was 389-731 t/ha, with the largest volumes on the mesic sites. The annual net primary production was 1.77-3.35 t/ha. The biomass of overstory above-ground litterfall was 1.48-3.02 t/(ha*a); the amount of macronutrients in litterfall was 24-41 kg/(ha*a). The largest litter production was on mesic sites. There was a considerable amount of epiphytic lichens in the litterfall (71-426 kg//(ha*a)). The amount of nitrogen in incident precipitation was greater than in throughfall, indicating that the tree canopy extracted nitrogen from rainwater. More than 1 kg/ha of nitrogen was extracted from rainwater during the summer sampling period. In contrast, up to 3 kg/ha of potassium, 1 kg/ha of calcium and 10 kg/ha of sulphur were leached from the tree canopy during the 13 weeks summer sampling period. It is possible that the high value for sulphur reflects the presence of a pulpmill about 20 km southwest of the study area. The results of the study were used to test the hypothesis that differences in phytosociological characteristics occurring on a topographic sequence along relatively short elevation transects are accompanied by sufficiently large changes in patterns of ecosystem function to distinguish these sites on a functional basis. Analysis of the data supported this hypo thesis. / Forestry, Faculty of / Graduate

A consumer characteristic profile of the snowmobile owners in Utah was compiled and compared to the general population in Utah and the United States. Other statistics were compiled which included user preferences of snowmobiling sites and machine characteristics. Data were collected by a mail survey of snowmobilers during the 1974-75 snowmobiling season. Approximately 315 questionnaires were analyzed. Additional data were collected from the Utah Division of Parks and Recreation. Total economic rent values were estimated for 58 sites in Utah . These values were then separated into location and quality values. This was done by reallocating trips to sites by means of a least cost programming technique. The value attributed to location was subtracted from the total and the residual is attributed to site quality. Ten site characteristics were chosen to analyze site quality. Stepwise regression was used to show this relationship. Increasing site carrying capacity was undertaken in the model to show the effect on site quality. An exposition factor for number nf trips was derived by using the largest use month, the month with the greatest number of trips recorded. Comparisons were then made between the unexpanded data to that and the expanded data.

This study examined leaf area index (LAI) and relationships with corresponding tree growth, climate and soil characteristics across New Zealand forest plantations. The aim of this study was to determine if quick measures of projected leaf area across environmental gradients of New Zealand were an accurate indicator of site quality. Projected leaf areas of Pinus radiata D Don and Cupressus lusitanica Mills seedlings were measured using a Li-Cor LAI-2000 plant canopy analyser at 22 locations representing the soil and climatic diversity across New Zealand plantation forests. Seedlings planted at 40 000 stems per hectare were used to test treatment effects of fertiliser, site disturbance and species over a 4 year period. It was hypothesised that collected climate and soil information would explain differences in LAI development patterns across sites as the canopies approached site and seasonal maxima. Averaged across sites Cupressus lusitanica 7.28 (± 2.59 Std.) m2 m-2 had significantly (p = 0.0094) greater projected LAIs than Pinus radiata 6.47 (± 2.29) m2m-2. Maximum site LAI (LAImax) varied from 2.9 to 11.8 m2 m-2 for Pinus radiata and from 3.1 to 12.6 m2 m-2 for Cupressus lusitanica. LAImax of both species was significantly and positively correlated with vapour pressure deficit, soil carbon, nitrogen, phosphorous and CEC, but negatively with solar radiation, temperature and soil bulk density. A seasonal model of LAI across sites illustrated an 8.5% fluctuation in LAI of established canopies over the course of a year. Despite considerable variation in climate and soil characteristics across sites the combined effects of LAI at harvest and temperature were significantly correlated with site productivity (r2 = 0.84 and 0.76 for Pinus radiata and Cupressus lusitanica respectively). A national model of LAImax (r2 = 0.96) was proposed for Pinus radiata across climate and soil environments and the significance of LAImax as a component of site quality monitoring tools is discussed.

Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1994. / Vita. Abstract. Includes bibliographical references (leaves 50-56). Also available via the Internet.

Thesis (Ph. D.)--North Carolina State University. / Includes vita. Includes bibliographical references (leaves 145-149) and abstract.