This thesis is an attempt to combine two opposing arguments which have appeared in the literature of labour economics for nearly 25 years. The analysis deals with the formulation of a collective bargaining model which yields some insight into the wage-determining process. The economic criteria for a wage settlement proposed by J. T. Dunlop in his book, Wage Determination Under Trade Unions, are combined with the 'political' or 'power' variables which A. M. Ross had advocated as the most important determinants of wages in his book, Trade Union Wage Policy. The result is an analysis very similar to that of recent bargaining theory studies. Six industries from the British Columbia economy are examined within the concept of the model developed. These industries produce a major part of the output of this region. The examination of these industries, therefore, provides a key to the comprehension of the general trends and forces at work in the British Columbia labour market. The model attempts to discover the variables most significant in explaining the movement of wages in each industry from 1948 to 1968. The variables examined represent a combination of the economic and political forces which are hypothesized to act upon the wage determination process. In addition, the thesis examines those industries in the-context of a general wage structure. It is hypothesized that the existence of such a structure plays a large role in the wage determining process and has a significant influence upon trends in the economic activity of the province. The end result will be an explanation of the single and collective wage movements of these six industries. The findings generally support the theoretical hypothesis that the wage determining process is subject to both political and economic forces. Economic variables are able to confine wage settlements within a range. The size of this range also depends upon economic forces. Within the range, however, bargaining may involve a multiplicity of criteria. Both the union and the firm will often choose some easily observable criteria upon which to base wage settlements. This study attempts to determine the main criteria chosen within each industry. The conclusions reached show that wage comparisons made among industries by both workers and employers are able to explain the largest part of wage movements. A bargaining theory model is supported and ample evidence of a wage structure which plays an important role in the wage determining process is found. / Arts, Faculty of / Vancouver School of Economics / Graduate

Frost damage to sapling size plantation Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco.] in the central interior of B.C. was identified as the major cause of dieback and canker through tree dissections. Prominent frost rings in the wood and frost damage to buds and shoots corresponded to the dates of dieback initiation and canker events throughout the history of the plantations. Frost rings and frost cankers were reproducible using an artificial freezing technique. Symptomatic frost-damaged buds and elongating shoots were described for Douglas-fir, white spruce [Picea glauca (Moench) Voss] and subalpine fir [Abies lasiocarpa (Hook.) Nutt.]. The effect of growing season frost was most noticeable on early flushing trees. Frost and dieback damage was most severe on concave and flat landforms, which are conducive to cold air pooling on nights with strong radiative cooling. Several pathogens isolated from recently killed stems were identified from fruiting bodies and culture. Leucocytospora kunzei (Sacc.) Urban was the pathogen most commonly isolated from the edge of expanding cankers and progressive dieback margins. Sclerophoma semenospora Funk was commonly found fruiting on dead stems and leaders killed by frost or by mechanical means. Cinara pseudotaxifoliae Wilson feeding caused latent cankers on one year old leaders of Douglas-fir, which are thought to be activated by frost. Boron levels of both healthy and severely affected trees were in the intermediate range, and were not considered to play an important role in frost or pathogen susceptibility for Douglas-fir in the interior. / Forestry, Faculty of / Graduate

A comprehensive seismotectonic model is developed to explain the seismicity of British Columbia. In order to do this extensive revisions are made to location and magnitude parameters in the Canadian Earthquake Data File. Fault plane solutions are calculated for all earthquakes possible and all mechanisms previously calculated are examined and upgraded where necessary. It is proposed that the subcrustal suite of earthquakes in the Puget Sound and southern Vancouver Island region are a result of strain caused by phase changes in the descending oceanic lithosphere of the subducting Juan de Fuca plate. The crustal earthquakes above the deeper seismicity can be explained with an oblique subduction model. The distribution of seismicity, the amount of seismicity and the focal mechanisms support these interpretations. The large earthquakes of central Vancouver Island are probably a result of the interaction of the Explorer Plate with the overriding America Plate. In the southern Queen Charlotte Islands thrusting components in the fault plane solutions confirm there is an element of convergence across the pacific/America boundary in this region. The distribution of seismicity suggests all relative plate motion is presently occurring along the Queen Charlotte fault. The Quaternary volcanoes of British Columbia show little correlation with the seismicity pattern except for the eastern end of the Anahim volcanic belt. / Science, Faculty of / Earth, Ocean and Atmospheric Sciences, Department of / Graduate

Aquatic arthropods communities were examined with respect to factors determining species distributions and community structure in a series of eight lakes on the Chilcotin Plateau of British Columbia. Climate, altitude, physical location, water temperature and basin shape were similar for all lakes, and although size differed, no evidence was found for the influence of basin morphology on community structure. Salinity and vegetation characteristics differed widely among lakes, so three major processes were investigated: the association of (1) salinity with faunal communities, (2) salinity with floral communities, and (3) faunal with floral communities. These relationships were examined in light of diversity-stability hypotheses. The severity component of environmental stability was represented by salinity, and mean surface water conductivity ranged from 56 to 13115 μS cm-¹ at 25 °C. Salinity variations among lakes were determined primarily by the ions Na, HCO₃, CO₃, C1 and K. Two classification schemes (taxonomic and ecological) and several analytical techniques (community parameters and cluster analysis) indicated that the distribution and structure of faunal and floral communities were related to salinity. In total, 84 arthropod taxa and 26 macrophyte species were found and divided into three groups: those characteristic of high salinities (>5000 μS), of moderate or low salinities (<5000 μS), or tolerant of all salinities. Faunal assemblages in all lakes were dominated by filter feeders, and predators were more abundant in saline lakes. Shredders, collectors and predators were found in all the lakes, but saline lakes had fewer size groups. Floating leaved macrophytes occurred only in freshwater lakes, submerged forms were rare in highly saline lakes, and emergent forms were found in all lakes, although they were less abundant at high salinities. Generally, this study supports the hypothesis that saline habitats have less diverse communities than freshwater ones. In all floral and faunal sample sets, increased salinity was accompanied by a decrease in species richness. Virtually all measures of macrophyte community diversity and productivity were inversely correlated with salinity. Faunal subgroups must be examined separately when measures of community structure incorporate relative abundances. Patterns of association observed in the entire faunal community were dictated by the numerically dominant entomostracan subcommunity, and patterns in other subgroups were masked. Zooplankton trophic level diversity increased with decreasing salinity and changes in community composition were analogous to those of eutrophication. In both coleopteran and hemipteran communities, diversity decreased and density increased with increasing salinity. Possible causal mechanisms structuring each community are hypothesized. Faunal distributions corresponded to their known habitat preferences in terms of macrophyte communities. It was difficult to distinguish between the influence of salinity or macrophyte communities on animal communities as animal communities were often associated with both. / Science, Faculty of / Zoology, Department of / Graduate

The seasonal distribution of herbage growth has particular importance for the management of grazing animals since the major objective of most pasture utilization plans is to provide sufficient feed for continuous grazing for as great a portion of the year as possible. Providing a more even distribution of herbage production has obvious practical advantages. The main objective of this study was to examine the annual growth pattern of herbage in the South Coastal region of British Columbia as affected by cultivars, cutting management and fertilizer management, with the aim of extending herbage production in the fall and increasing herbage availability during the summer months. These investigations were conducted in plot trials at three different sites. Forage quality was also examined at two of these sites. In addition to these plot cutting trials an investigation into the accuracy of a height/density meter (disc meter) was conducted. The disc meter, and other similar non-destructive devices, have great potential as both research and farm management aids. The first plot cutting trial was conducted at Agassiz, B.C. and examined the productivity of two orchardgrass (Dactylis glomerata L.) cultivars, Prairial and Sumas and two perennial ryegrass (Lolium perenne L.) cultivars, Barlano and Norlea under two cutting regimes (low-infrequent and high-frequent). Annual yields averaged over the three years for low-infrequent (LI) cutting showed significant (P<0.05) differences between cultivars with the following ranking: Prairial (10,644) > Sumas (9,537) > Barlano (8,448) > Norlea (6,666 kg DM/ha). Annual yields averaged over two years for high-frequent (HF) cutting also showed significant (P<0.05) differences between the cultivars with the same ranking: Prairial (9,390) > Suinas (8,625) > Barlano (7,686) > Norlea (5,953 kg DM/ha). The same ranking of cultivars in terms of annual yield was obtained in each harvest year for both LI and HF cutting treatments. Annual herbage yields over the three years of the trial showed considerable variation in response to climatic factors. Average annual yields in 1984 (10,116) and 1986 (10,237 kg DM/ha) were not significantly different (P>0.05). However, yields in 1985 (5,916 kg DM/ha) were significantly (P<0.01) lower than 1984 and 1986 due to a wet, cool spring and exceptionally dry summer. Cutting regime did not have a significant effect on annual yields. There were no significant (P>0.05) differences between average annual yields under HF (7,914) and LI (8,824 kg DM/ha) cutting, nor were there any significant (P>0.05) differences in annual yields between cultivars due to cutting treatments. There was a tendency for LI cutting to produce higher yields than HF cutting for Prairial, Sumas and Barlano with the reverse being true for Norlea. Examination of productivity on a seasonal basis indicated differences in yield due to cutting regime, depending on the season. During the spring LI cutting produced greater yields than HF cutting due to the greater yields obtained from the longer regrowth period and lower cutting height (Reid and MacLusky, 1960; Bland, 1967; Anslow, 1967). However, during the dry summer months the reverse situation was observed with HF cutting producing higher yields than LI cutting. Sucli a reversal in yield is attributable to the dry conditions under which high cutting has been shown to produce more herbage than low culling (Janti and Kramer, 1956; Appadurai and Holmes, 1964). Under LI cutting orchard grass produced 34 and 46% of annual yield in the spring for 1984 and 1985 respectively and 52 and 40% of annual yield in the summer for the same two years. This distribution was changed under HF cutting with 21 and 36% of annual yield produced in the spring for 1984 and 1985 respectively and 65 and 50% of annual yield produced in the summer for the same two years. The situation was similar for perennial ryegrass. Under Ll cutting perennial ryegrass produced 53 and 58% of annual yield in the spring for 1984 and 1985 respectively and 25 and 30% in the summer for the same two years. Distribution of annual yield was more even under HF cutting with 28 and 35% of yield produced in the spring of 1984 and 1985 respectively and 63 and 50% produced in the summer of the same two years. Variation in the distribution of annual production was also evident between orchardgrass and perennial ryegrass. Both orchardgrass cultivars produced a greater portion of their yield during the summer, whereas both perennial ryegrasses produced a greater portion of yield during the spring and early summer. Growth curves were developed for each cultivar for both cutting treatments over all harvest years which indicate the variability in the seasonal distribution of annual yield attributable to climatic factors and which can be varied by cutting management and choice of cultivars. Another trial conducted at the U.B.C. Research Farm #2, Oyster River, examined the effect of split nitrogen (N) applications on annual and seasonal yields. Under regime I a total of 100 kg N/ha was applied in April. Regimes II, III and IV involved application of a total of 300 kg N/ha at varying times over the growing season. Application of 300 kg N/ha produced significantly (P<0.05) higher annual yields (mean, 10,228) than application of 100 kg N/ha (7,706 kg DM/ha). Annual yields produced under regimes II, III and IV were not significantly (P>0.05) different (10,248, 10,245 and 10,192 kg DM/ha respectively). The seasonal distribution of yield was affected by N application regime. Regime III produced a greater portion of annual yield during August (20.1%) compared to the other three regimes (mean, 13.4%) and application of 100 kg N/ha in August produced significantly (P<0.05) higher yields for regime IV (1,104) compared to the other three regimes (mean, 426 kg DM/ha). The August N application also produced significantly (p<0.05) higher yields in the following spring for regime IV (2,774) than yields obtained for regimes II and III (mean, 1,810) and regime I (1,341 kg DM/ha). Such yield improvements in the spring could have been due to improved root reserves and/or root mass produced from the August N application. Two other trials conducted at Abbotsford also examined cutting treatments and N application regimes. The cutting trial examined the yields produced by four cutting regimes examining: high-frequent (HF), high-infrequent (HI), low-frequent (LF) and low-infrequent (LI) cutting combinations. Annual yields were significantly (P<0.()5) lower for LF (6,721), HI (6,066) and HF (5,674) cutting regimes than the LI (8,207 kg DM/ha) regime. Low cutting (7,464) produced significantly (P<0.05) greater yields than high cutting (5,870 kg DM/ha) while there were no significant (P>0.05) differences between frequent (6,197) and infrequent cutting (7,137 kg DM/ha). Unlike the Agassiz trial, high cutting produced no yield advantage during the dry summer months due to the exceptionally dry period where growth stopped under all cutting regimes. The Abbotsford fertilizer trial examined split N application in a similar manner to the Oyster River trial. However, due to the dry summer there was little response to applied N throughout most of the summer and thus little variation in distribution of annual yield. Regimes II, III and IV involved application of a total of 300 kg N/ha and produced significantly (P<0.05) more herbage (mean, 5,584) than the application of 0 N under regime I (3,758 kg DM/ha). Annual yields did not differ significantly (P>0.05) between regimes II, III and IV. Results from the four cutting trials indicate that the annual and seasonal distribution of yield can be affected by management factors such as variety and cultivar selection, fertilization management and defoliation management. Forage quality was examined at both the Agassiz and Oyster River sites. Differences in forage quality were noted as a result of year, seasonal, cultivar, fertilization and cutting treatment effects. Investigations were also conducted to examine the use of a height/density disc meter to measure herbage yield. A significant relationship (P < 0.001) was found between herbage yield and disc height for vegetative growth but more mature growth, with stems and seed heads, yielded a poor relationship. The use and accuracy of the instrument is discussed. / Land and Food Systems, Faculty of / Graduate

A study of beach profiles and sediment activity has been undertaken investigating natural beaches of inner coastal southwest British Columbia and published data on laboratory beaches. Two separate types of sediment activity are focused upon: longshore sediment, activity occurring on inner coast beaches and on- offshore sediment activity occurring on wave Hume constrained laboratory beaches. Field investigative work on twenty-five natural beaches has included review of past-field studies, profile surveys, sediment tracing experiments, investigation of surface and subsurface sediment, size distribution and structure, measurement of slopes and elevations of shoreline features, review of available wave climate data and wave hindcasting for the period of profile surveys. The work has shown that inner coastal beaches are predominantly shingle beaches or cobble armoured beaches with longshore sediment transport, occurring in a narrow upper foreshore zone under wave action at high tides. There is also evidence that coarse materials (gravels and cobbles) move selectively in an onshore direction and fine materials (silts and sands) move in an offshore direction. The sediment transport processes and beach characteristics identified are different from the summer/ winter beach process known to occur on open coasts. Laboratory beaches have been studied to identify the general response of a beach profile to waves. One problem in the study of beaches has been the lack of a readily measured variable to interrelate wave action and sediment movement. By studying laboratory beach profiles a variable representing on-offshore sediment, movement has been abstracted as an area swept out by differencing two profiles as a function of time. The variable has been investigated using laboratory beach data and correlation between it and wave parameters such as height, and period is evident. A dimensional analysis of on-offshore sediment transport is performed using the swept, area variable. / Applied Science, Faculty of / Civil Engineering, Department of / Graduate

Evapotranspiration from a forest clearcut was measured over two growing seasons as part of a larger study of the microclimate of forest clearcuts and microclimate modification by site preparation. Pinegrass is the dominant species on clearcuts in the dry southern interior and is the major competitor with coniferous seedlings. This paper examines the water use of a pinegrass dominated clearcut and the response of surface conductance to environmental variables. Evapotranspiration was derived from eddy correlation measurements of sensible heat flux and measurements of net radiation and soil heat flux. 419 hours of daytime energy balance data from the summers of 1987 and 1988 were analyzed. A rearranged form of the Penman-Monteith equation was used to calculate hourly mean surface conductances for the clearcut. Leaf area measurements were used to calculate stomatal conductance from surface conductances. Stomatal conductance was modelled using boundary-line and non-linear optimization techniques. The most successful model (R² = 0.71) was obtained using non-linear optimization with stomatal conductance as a non-linear function of saturation deficit at the leaf surface (D₀) and solar irradiance. D₀ was calculated from measured evapotranspiration and surface conductance. Response of stomata to saturation deficit would be expected to be better correlated to D₀ than D measured at a reference height above the canopy. Stomatal conductance was also modelled as a function of D (measured at 1.3 m) and solar irradiance. The resulting model (R² = 0.50) was poor compared to that based on D₀. Saturation deficit and temperature were found to be highly correlated both at 1.3 m above the canopy and at the leaf surface. Use of air temperature in the conductance model caused R² to decrease. No relationship between stomatal conductance and volumetric soil water content was found. Hourly evapotranspiration rates calculated using modelled surface conductances agreed well with measured rates.(R² = 0.89). Evapotranspiration was also modelled using the Priestley-Taylor approach. The mean hourly a for all daylight data was found to be 0.81. This simple model was found to give comparable results to the stomatal conductance based model (R² = 0.85). / Land and Food Systems, Faculty of / Graduate

Geomagnetically Induced Currents (GIC's) in B. C. Hydro's 500 kV transmission system have in the past been responsible for the generation of harmonics of 60 Hz, system voltage drops, and misoperation of relay units. Characterization of the associated magnetic storms' spatial scales would further the understanding of GIC generation in the area, and allow advanced warning of potential problems in future power transmission projects. Data collected in 1984 at four substations were analysed to determine lateral variations in geomagnetically induced earth surface electric fields. Inversion techniques were employed to find a variety of solutions that would reproduce the data. Results suggested that the magnetic storms were larger than the area monitored, and that resultant electric fields seen by a large portion of the transmission grid were uniform. Departures from this uniformity in other portions of the electric field models were felt either to be due to earth induction effects, or in some cases, to be artifacts of the data analysis techniques. An experiment designed to determine the controlling factors behind GIC's is outlined. Considerable effort would be required to explicitly determine all electric fields affecting the transmission system / Science, Faculty of / Earth, Ocean and Atmospheric Sciences, Department of / Graduate

The topic of this thesis is the relationship between transportation modes and regional economic development. The objective is to determine the influence of the mode on the pattern of development. The three most significant variables in transmitting the influence are seen to be: the construction pattern and attributes of the transport systems; the resources of the region; and the stage of development of the region. The basis of the relationship is that theoretically and empirically, in a frontier region transportation is one of the most effective and controllable factors influencing industrial investments. The relationship is examined by associating private investments in northeastern British Columbia with the demand and supply of transportation units in the region. The investment statistics are drawn from government publications while the transportation units are documented in a variety of ways. Firstly, the historical development of the networks is discussed. Then, a measure of the road network is developed to simulate the changing relative lengths of the road links over time. Investment in industrial categories in the study region was found to be related to attributes of transport networks, such as rates and frequency. Correspondence with firms in the study area supplied additional information about transportation needs and costs. The empirical data on transportation networks are discussed in terms of theories of industrial location and regional economic development to arrive at explanations of the spatial and temporal distribution of the investment. The conclusions drawn from the study verified that investments in certain sectors of the economy were related to specific transport modes. Investments in some primary industries were dependent on certain transport units supplied by the rail network. Cheaper freight rates, volume and size restrictions and frequency characteristics of the rail mode made it attractive to those industries which traditionally had low value-to-weight ratio goods. Investments in the primary industries were also associated temporally with changes in the rail network. The wood products and paper and allied industries received investments temporally and spatially related to changes in the rail network. Investments in industries linked with these primary industries were also documented showing temporal sequence patterns. The findings demonstrated that in a resource region, transportation units with specific characteristics are desired to facilitate development of resources. Cost was found to be one dominating consideration. Some industries which used the rail system, could have used the road network but it would have cost 10-30% more to do so given the characteristics of the existing roads. It was found in other industries that the frequency of service or volume capacity characteristics of the rail system were superior to the road system. These characteristics were found to be the most important in the study region and were incorporated into a model of transport related development in a frontier region. The first stage of the model covered the development of an interregional link to join the region with its potential markets. This interregional link or path was at first supplied by a road network and is traditionally of poor quality. The second stage coincides with the "opening up" of the region. Resources are developed and some processing of these resources begins. At this stage, a rail network with its lower rates, large capacities and interregional characteristics is the most useful mode. During this stage the region is slowly beginning to develop its urban hierarchy, but is still sparsely settled. The third stage is reached when activities are linked both in a forward and backward direction, to give the region a greater range of products, and in general products with a higher value-to-weight ratio. Because of this and because the urban hierarchy begins to develop, the highway network becomes more competitive. The model therefore presents a way of looking at the changing function of road and rail networks as a frontier region develops. This changing function is based on the characteristics of the transport modes, the production mix of the region and the level of development of the region. / Arts, Faculty of / Geography, Department of / Graduate

Factors affecting the natural revegetation of areas disturbed by airborne emissions were studied at the Anyox smelter on the northern coast of British Columbia. Revegetation of areas where vegetation and soil were removed by industry were studied on mine waste dumps on Vancouver Island, on mine wastes in the West Kootenays, and on abandoned logging roads on Vancouver Island and near Lumby. At Anyox, much of the direct evidence of fume damage was eradicated by a fire in 1942, which occurred eight years after smelting operations ceased. This fire encompassed a five-mile radius surrounding the smelter. Tree-ring analysis on surviving western hemlock trees, extending from the edge of the fire to the head of Alice Arm, showed a strong relationship between the tonnage of ore smelted and the radial increment. Tree growth was initially depressed when smelting began in 1914 and remained low until smelter operations ceased. At this time the growth dramatically increased, but by 1970 the annual radial increment had returned to a slow rate similar to before smelting operations began. Western hemlock was much less susceptible to fume damage than western red cedar. Although total fume kill occurred on western red cedar as far south as the Nass River, north to the head of Hastings Arm and East to the head of Alice Arm, total kill on hemlock took place within a few miles of the smelter. Fume damage was the heaviest near the smelter and near the head of Alice Arm where the topography confined the fumes, rendering them more effective. Within the area affected by the 1942 fire, revegetation was slow near the smelter and was more rapid near the mature vegetation. Seeds which are easily dispersed by light wind, were responsible for the majority of colonizing species many of which were found rarely in the surrounding unburned vegetation. On logging roads and mine waste materials, seed source availability appeared to be the major factor in determining the colonizing species. Light wind-blown seeds were the initial colonizers on coastal logging roads, and adjacent vegetation supplied the seed source for the interior logging roads. The establishment of salal through vegetative means was' observed to occur on coastal logging roads. Species with the ability to fix nitrogen, with the exception of alder, played a minor role in natural revegetation of most areas. Slow revegetation of large-scale disturbances was attributed partly to the lack of adequate seed. The most common cause of slow revegetation in most areas was moisture deficiency. Moisture availability on mine wastes at Cumberland appeared to be determined by slope, aspect, color, shading and mound height. On logging road surfaces, in both Lumby and coastal areas, a reduction in plant growth on steeper slopes was attributed to reduced moisture. Wind exposure was found to be the most important factor governing revegetation of mine wastes in the West Kootenays. Coarse textured material was related to a lower percentage cover of vegetation on the surface of coastal logging roads. Uniformly coarse textured material on the waste dumps in the West Kootenays precluded any significant statistical relationships. Coarse textured materials, nevertheless, had a general inhibitory effect on the rate of revegetation of many of the mine waste dumps. Steep unstable slopes were a major factor which prevented revegetation of West Kootenay mine wastes and on the upslope of road cuts. The scale of disturbance was found to magnify or obscure many of the factors important to successful plant colonization. The chemical composition of waste material, although studied only peripherally, did not appear to be a major factor in determining the revegetation of disturbed areas at the sites studied. Low pH values, which are often taken as a barometer of mine waste toxicity, occurred rarely. In many instances, high pH values may have prevented the successful invasion of acid-loving species. In applied reclamation procedures, it is mandatory that objectives for future land use be incorporated into planning, along with the anticipation of inhibiting factors. If no conditions are left which prevent plant growth, then reclamation will be straightforward and land use goals will be more easily satisfied. / Forestry, Faculty of / Graduate