86 results for Allen, R. B.

  • Tree species richness and turnover throughout New Zealand forests

    Bellingham, P. J.; Stewart, Glenn H.; Allen, R. B.

    Journal article
    Lincoln University

    Patterns of mortality, recruitment, and forest turnover were investigated using permanent plot data from temperate forests in 14 localities throughout New Zealand. Tree mortality and recruitment rates were calculated from tagged trees ≥ 10 cm diameter at 1.4 m on individual 400 m² plots, and turnover rates were calculated as the mean of mortality and recruitment rates. Turnover rates (1.4% per year) were very similar to those recorded for tropical forests (i.e. 1.5% per year). As was shown in tropical forests, we also found significant relationships between forest turnover and species richness. In New Zealand forests there was also a decrease in species richness and turnover rates with increasing latitude. Although species richness is well known to decline with latitude, our study provides support for a possible link between seasonality and disturbance with tree turnover and species diversity. While tree mortality and recruitment rates were approximately in balance at some localities, in others there were imbalances between mortality and recruitment rates.

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  • Vegetation of the Dunedin Town Belt

    Allen, R. B.; Johnson, P. N. (1982-05)

    Report
    Landcare Research

    This report has been prepared for the Dunedin City Parks and Recreation Dept to assist in their preparation of a management plan. It is based on a survey done in April 1982 of the Town Belt between the northern and southern cemeteries but excluding the Botanic Gardens. We delimited 25 areas, each bounded by roads or other features. These areas, labelled a to y and given short names, form the framework for description of the vegetation and flora. For each area, the structure and composition of the main plant communities are described, along with comments on condition, trends and management of the vegetation. Comments are concentrated on the more natural and predominantly native portions of forest. All plant species recorded are listed in the back of the report. (auth)

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  • Vegetation of the western Silver Peaks area

    Allen, R. B. (1983-06-03)

    Report
    Landcare Research

    The western Silver Peaks area contains silver beech forest remnants representing the eastern limits of similar forest which was once widespread further inland. Tussock grassland in the area is an example of the vegetation which replaced forest after destruction by pre-historic fires. Scrub communities demonstrate the process of re-establishment of forest in the present grasslands. The study area includes important tramping routes and natural landscapes. It is recommended that formal reserve status is conferred on the area encompassing the western catchment of the south branch of the Waikouaiti River, the uplands of Silver Peaks, and the Silver Stream catchment. It is also recommended that wherever possible, indigenous vegetation on Swampy and in the Waitati Valley should be protected under the provisions of the Reserves Act and the Q.E. II National Trust. (auth)

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  • Botanical survey : upper Tahakopa valley

    Allen, R. B. (1982-03-05)

    Report
    Landcare Research

    The area surveyed contains 5 vegetation types; rough pasture, Cassinia scrub, manuka scrub, broadleaved scrub, and kamahi forest. Lower altitude manuka scrub is becoming rare in the Catlins. The vegetation is fire induced with a long history of destruction until the 1950's. It is recommended that the area be protected. (auth)

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  • Impact of cattle, Weka Flat and Lake Sylvan, Mount Aspiring National Park

    Allen, R. B. (1983-02-17)

    Report
    Landcare Research

    Three vegetation types were recognised at Weka Flat: grassland, riparian beech and roadside embankment scrub. The vegetation is not of botanical importance but grazing would prevent the reestablishment of native species. Three different wetland types were surveyed near Lake Sylvan. Two natural bogs are in good condition while swamp induced by forest destruction shows some surface damage and has many exotic plant species. Access routes used by cattle in adjacent beech forest show damage from trampling and browsing. The forest edge between the Route Burn and the outlet stream of Lake Sylvan is severely damaged by cattle. To protect the wetlands, forest interior and forest edge, the exclusion of cattle is recommended

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  • Akatore Creek : proposed reserve

    Allen, R. B. (1986-07-31)

    Report
    Landcare Research

    The vegetation and plant habitats of the proposed Akatore Creek Scenic Reserve are described with management recommendations.

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  • Vegetation of the east face of the Maungatua Range, East Otago

    Allen, R. B. (1985-03-08)

    Report
    Landcare Research

    Vegetation on the eastern face of the Maungatua Range was surveyed to assess its biological and landscape values. Logging, clearing, fire and grazing have markedly modified native vegetation and encouraged the establishment and spread of exotic scrub weeds. Nevertheless, remaining native forest, scrub and snow tussock communities are in healthy condition, and regenerate well in the absence of disturbance. In the absence of clearance, fire and stock, native vegetation would eventually re-establish over most of the area. With continuation of present management practices, the condition of native vegetation will deteriorate. It is recommended that all land at present not in developed pasture should be protected.

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  • Woodhaugh scenic reserve (proposed)

    Allen, R. B. (1986-07-31)

    Report
    Landcare Research

    The vegetation and plant habitats of the proposed Woodhaugh Scenic Reserve are described with management recommendations.

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  • Estimation of merchantable firewood volume in untended kanuka stands in eastern Otago

    Allen, R. B.; Lee, W. G. (1990-01-20)

    Report
    Landcare Research

    The habit of kanuka plants, range of stern diameters in a stand, and variable density of stands, do not allow use of volume estimation methods appropriate to timber crops from tended plantations. The purpose of this study was to explore the possibility of a simple method for providing accurate estimates of merchantable volume from untended closed canopy kanuka stands.

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  • Vegetation on a yellow-grey earth soil at Boulder Hill, east Otago

    Allen, R. B. (1987-05-13)

    Report
    Landcare Research

    Manuka scrub is replacing highly-modified snow tussock grassland on a yellow-grey earth soil between 200 and 300 m altitude in the Otago Coast Ecological Region. An adjacent forest remnant contains broadleaved small tree species and an isolated stand of silver beech. Forest is likely to succeed manuka scrub on the yellow-grey earth, broadleaved species predominating at first, with the podocarps matai, totara and kahikatea becoming important in the long term. Protection of the yellow-grey earth site and adjacent predominantly indigenous vegetation is recommended.

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  • Proposed tussock grassland reserves, Horse Range, Waianakarua Ecological District : botanical report

    Allen, R. B. (1984-12-10)

    Report
    Landcare Research

    Two areas of snow tussock grassland at the eastern end of the Horse Range, Otago, were surveyed to assess their potential for reservation (NJT)

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  • Newhaven Scenic Reserve (proposed)

    Allen, R. B. (1988-03-30)

    Report
    Landcare Research

    This tiny scrap of highly modified forest may once have been similar to that in the Manuka Point Scenic Reserve, a few hundred metres downstream. It contains some tree species surprisingly not recorded at Manuka Point- kahikatea , matai and kamahi - but lacks many species found there. Neither area is as representative of estuarine edge vegetation as the nearby much larger Pounawea Scenic Reserve . The Newhaven proposed reserve is too small and modified to be of significant biological value, and is visually scruffy. Because it is relatively inaccessible and impenetrable, it has little or no recreational value. It appears to be eroding at the water's edge, where there are many fallen trees.

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  • Botanical and soil study : Warrington sewage scheme

    Allen, R. B.; Lee, W. G.; Johnson, P. N.; Hewitt, A. E. (1986-08-19)

    Report
    Landcare Research

    An inventory of the flora and vegetation of Warrington Sandspit, Blueskin Bay, Dunedin, is presented along with the likely effects of the application of treated sewage effluent on the vegetation.

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  • Vegetation of unoccupied Crown Land in the Dingle Burn and Timaru River catchments, Wanaka Ecological District

    Allen, R. B.; Lee, W. G. (1990-03-06)

    Report
    Landcare Research

    A vegetation survey was undertaken on unoccupied Crown Land in the upper Dingle Burn and Timaru River catchments, Wanaka Ecological District, for the Department of Conservation, Christchurch. Seven major vegetation types were recorded: subalpine shrubland, snow tussock grassland, cushionfield/fellfield, scree, snowbank, flush and rock outcrop. The area contains plant communities representative of the eastern part of the Wanaka Ecological District. Except for some grazed areas of alpine Chionochloa macra grassland, the vegetation is in more natural condition than its equivalent on adjacent pastoral land to the east. Past burning and deer browsing have locally depressed Nothofagus solandri var. cliffortioides forest treeline and reduced Chionochloa rigida density on some sunny faces in low alpine grassland, but Nothofagus is re-establishing and C. rigida is recovering dominance in the absence of burning and grazing. Sheep grazing has severely modified alpine Chionochloa macra grassland on and near sheep routes and camps, where C. macra plants have been damaged or destroyed. Palatable herbaceous species are restricted to refugia on rock outcrops. Continued grazing at present levels would eliminate remaining Chionochloa macra grassland within a few decades, reduce Chionochloa rigida density and stature, lower the diversity and frequency of native grassland species in previously modified C. rigida grassland, and establish dominance of exotic pasture species, including Hieracium, in intertussock vegetation. The unoccupied Crown Land has high conservation and pastoral values, both linked to the extent and condition of Chionochloa macra grassland. Continued grazing at present levels will reduce these values to those of adjacent pastoral land.

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  • Vegetation types of the Catlins Ecological Region

    Allen, R. B. (1988-07-26)

    Report
    Landcare Research

    A description of the vegetation types of the Catlins and their significance in national and regional terms, to determine interpretation and protection needs. This report is based on several published and unpublished accounts of vegetation in the Catlins, and on personal experience of the area. Vegetation types are identified, with their altitudinal range, general distribution, and locations at which they have been recorded. (auth)

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  • Frasers Gully proposed reserve

    Allen, R. B. (1987-08-07)

    Report
    Landcare Research

    Frasers Gully is a popular recreational area, an important part of the landscape of the Dunedin suburbs Brockville , Glenross and Halfway Bush, and retains significant remnants of the pre-European forest cover of the Dunedin Ecological District . The main walking track is well formed and maintained , and the several secondary tracks, probably formed and used by children, have an insignificant impact on other values in the reserve. Planted exotic trees add an interesting element to the landscape, and generally do not detract from the biological or scenic qualities of the reserve. There seems to be little naturalisation of nuisance species , but sycamore and blue gum warrant occasional monitoring for this tendency. Elder, Muehlenbeckia, blackberry, broom and gorse are a nuisance in places, particularly on the steep slopes below Dalziel Road , but do not prevent or detract from public use or enjoyment of most of the area , should not spread, and require little, if any, control. The pasture area between Brockville Road and the Kaikorai Stream contributes to the pleasant rural landscape , and should be retained and grazed as part of reserve management. This is the only part of the reserve that really requires fencing. Podocarp regeneration is negligible apart from totara, and planting of stock raised from local seed will be required to maintain populations of rimu, matai, miro and kahikatea.

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  • Otago Coast State Forest : vegetation survey of the Morrison, Popham and Moneymore blocks

    Allen, R. B. (1985-06-21)

    Report
    Landcare Research

    Nine vegetation types were recognised in the survey. Native vegetation in the Moneymore block is all successional. In the absence of fire and stock it would develop into broadleaved forest, eventually with podocarps. Similar vegetation is in the Taieri River Scenic Reserve. Podocarp forest remnants on the Morrison and Popham Blocks, while modified by logging and browsing, are of botanical value in representing the pre-European vegetation of coastal hills in the Tokomairiro Ecological District. It is recommended that podocarp stands and adjoining kanuka forest be protected on the Morrison and Popham blocks, as well as vegetation containing flax, kanuka, cottonwood, manuka, bracken and silver tussock on the Popham block, between the summit of Ferry Hill and the podocarp stand on its lower slope. (auth)

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  • Preliminary assessment of DSIR eucalypt trials in Southland

    Begg, J.; Wills, B. J.; McIntosh, P. D.; Allen, R. B.; Wallace, H. J. (1991-11)

    Report
    Landcare Research

    This report is based on an interim assessment of the plantings at the Garston and Nithdale sites. Survival and vigour are recorded, along with applicable comments regarding frosting etc. This information supplements that from the more detailed 1990-91 assessment and will be followed by a full assessment and report in autumn 1992.

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  • Botanical survey of scenic and allied reserves in Otago : interim report

    Allen, R. B. (1976)

    Report
    Landcare Research

    A report on 33 reserves in the Dunedin and Catlins districts of Otago, to make a case that their rapidly deteriorating condition should be improved. Animal browsing has caused severe damage in many cases and provisions set out in the Reserves and Domains Act are not being adhered to - in some cases felling and burning is still continuing. The report includes a brief description of the composition of the reserves, their importance and condition, with recommendations for immediate action. (auth)

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  • Botanical report, coastal reserves survey, Clutha County

    Allen, R. B.; Lee, W. G. (1978-07-26)

    Report
    Landcare Research

    This report gives brief botanical descriptions of coastal reserves between the Clutha mouth and Tahakopa, Clutha County. (auth)

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