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Report on the experimental vegetation plots established on 3 abandoned toxic Yukon mine tailings sites, revisited in 2009
In July 2009 we re-visited the re-vegetation experiments, which had been set up on tailings in the period 2003-2006. The three experimental sites are at Mount Skukum, United Keno and Wellgreen. The experiments consisted of either seeding the tailings with various populations of the tufted hair grass and/ or with stratified (cold temperature treated) seed of the shrub soapberry, or making transplants of the same two species. The treatments included the addition of compost from the City of Whitehorse, addition of fertilizer as 7:7:7 pellets, addition of organic matter as sheep manure, peat or woody debris from on site and, in the case of Wellgreen, a lime addition to overcome the strong acidity. The results are striking and illustrated in the Plates 1-15. Data of performance and flowering success are shown in the Tables, as are chemical analytical data in the Figures and Tables. Plots set up in 2003 provide a nucleus for effective re-vegetation, having survived for 6 years. The success of the seedings and transplants at Mount Skukum and United Keno was good, while that at Wellgreen was very poor. Wellgreen has suffered flooding with washing out of plots and washing out of the neutralizing lime. Nevertheless, in compost additions plots at Wellgreen, set up in 2005 and 2006, a small amount of re-vegetation and survival has occurred, especially in the wetter areas near the tailings pond.
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Investigation into the Reprocessing of Elsa Tailings
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This project was undertaken to evaluate the potential to economically recover additional metal values from the 4.6 million tons of Keno Hill flotation tailings which grades 3-4 oz/t silver, 0.8% lead and 0.9% zinc. The study determined that the higher grade portion of the tailing, containing some 1.0 million tons at 5.35 oz/t Ag, responds well to cyanide heap leaching with a silver recovery of 50-60%. The testing data suggests that heap leaching is economically feasible at the current silver price of $US5.50/ounce and a currency exchange rate of 1.35 in favour of the US dollar. The response to gravity and flotation concentration was poor.
Vegetation of the Cessnock-Kurri Region - Pre1750 VIS ID 184
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A vegetation survey, classification and mapping program of the Cessnock-Kurri region was carried out during 2006-07 by Stephen Bell and Colin Driscoll. The survey was principally to clarify the composition and distribution of three Endangered Ecological Communities (EECs). Nearly 70000ha of land was examined between the foothills of the Watagan Range in the south, the Corrabare and Broken Back Ranges in the west, North Rothbury in the north, and the Wallis Creek floodplain in the east. The main aim of the study was to identify, classify and map all extant vegetation within the study area, as well as to provide a pre-1750 vegetation map of the area.; Vegetation condition and Disturbed vegetation mapping components were also included, to assist in determining priorities for future rehabilitation of sensitive lands.; VIS_ID 184
Vegetation of the Cessnock-Kurri Region - Extant VIS ID 183
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A vegetation survey, classification and mapping program of the Cessnock-Kurri region was carried out during 2006-07 by Stephen Bell and Colin Driscoll. The survey was principally to clarify the composition and distribution of three Endangered Ecological Communities (EECs). Nearly 70000ha of land was examined between the foothills of the Watagan Range in the south, the Corrabare and Broken Back Ranges in the west, North Rothbury in the north, and the Wallis Creek floodplain in the east. The main aim of the study was to identify, classify and map all extant vegetation within the study area, as well as to provide a pre-1750 vegetation map of the area.; Vegetation Condition and Disturbed vegetation mapping components were also included, to assist in determining priorities for future rehabilitation of sensitive lands. VIS_ID 183
Kosciuszko National Park Resorts Vegetation Thredbo 2003 VIS ID 4841
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Vegetation of Thredbo, Kosciuszko Resorts Vegetation Assessment 2003. Associated Report: "Kosciuszcko Resorts Vegetation Assessment", Ecology Australia 2003 Fieldwork was carried out on 19-29 March 2002. A random sampling strategy was employed using the recent air photographs as a guide to the range of vegetation types present. Sampling points were chosen to represent variation in the vegetation observed in the field. Quadrat sizes were as follows: * 25 m2: bogs, herbfields and grasslands * 100 m2: heaths and woodland. A total of 216 quadrats were sampled. The following number of quadrats were sampled at the respective resorts: Thredbo 72 Perisher 54 Charlottes Pass 48 Bullocks Flat 14 Mt Selwyn 28 An additional 40 quadrats, previously surveyed at Thredbo in 2000 (J. Miles unpubl. data), were also analysed with the data set. In each quadrat all vascular plant species observed were recorded and assigned a visually assessed cover/abundance value from the modified Braun-Blanquet scale (Gullan 1978). Vegetation mapping was based on Air Photo Interpretation (API) of 2002 1:8000 air photos, field checking and interpretation of the quadrat data. VIS_ID 4841
Kosciuszko National Park Resorts Vegetation Perisher 2003 VIS ID 4840
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Vegetation of Perisher, Kosciuszko Resorts Vegetation Assessment 2003. Associated Report: "Kosciuszcko Resorts Vegetation Assessment", Ecology Australia 2003 Fieldwork was carried out on 19-29 March 2002. A random sampling strategy was employed using the recent air photographs as a guide to the range of vegetation types present. Sampling points were chosen to represent variation in the vegetation observed in the field. Quadrat sizes were as follows: * 25 m2: bogs, herbfields and grasslands * 100 m2: heaths and woodland. A total of 216 quadrats were sampled. The following number of quadrats were sampled at the respective resorts: Thredbo 72 Perisher 54 Charlottes Pass 48 Bullocks Flat 14 Mt Selwyn 28 An additional 40 quadrats, previously surveyed at Thredbo in 2000 (J. Miles unpubl. data), were also analysed with the data set. In each quadrat all vascular plant species observed were recorded and assigned a visually assessed cover/abundance value from the modified Braun-Blanquet scale (Gullan 1978). Vegetation mapping was based on Air Photo Interpretation (API) of 2002 1:8000 air photos, field checking and interpretation of the quadrat data. VIS_ID 4840
Windy McKinley terrane, Stevenson Ridge area (115JK), western Yukon: composition and proposed correlations, with implications for mineral potential.
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Recent mapping in the ‘Windy McKinley’ terrane of Stevenson Ridge area of western Yukon defined two subdivisions of the terrane, an imbricated ophiolite and a succession of predominantly fine-grained, variably carbonaceous and calcareous clastic rocks extensively intruded by Middle Triassic gabbro. Further work in 2007 has revealed a third subdivision of felsic metavolcanic and carbonaceous clastic rocks, also spatially associated with voluminous gabbro. The two subdivisions of the terrane containing gabbro are reminiscent of the two subdivisions of the Delta district of Alaska, and gabbroic rocks from the two areas are coeval and geochemically similar. If the Stevenson Ridge successions correlate with those of the Alaska Range, the mineral potential of the Stevenson Ridge area would be appropriately increased.
Three Parks Savanna Fire-effects Plot Network (Fauna): Vertebrate Trapping, Nitmiluk National Park, Northern Territory, Australia, 2018
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These data are records of all vertebrates trapped at a set of sites within Nitmiluk National Park surveyed in either 2017 or 2018. A total of 20 sites were surveyed for terrestrial vertebrate fauna using a range of survey methods. Thirteen sites have prior monitoring through the Three Parks (Kakadu, Litchfield and Nitmiluk) Savanna Fire-effects Plot Network which involved sampling at 5-6 year intervals at 220 plots established from 1996 – 2002. Seven sites have no prior monitoring. In 2017/18 a paired plot design was implemented at all sites, involving the duplication of some but not all survey methods at a second plot directly adjacent to the traditional plot. Cage and Elliott traps were operated at plot 1 (the traditional plot at those sites with prior sampling). Three pit traps were installed and operated within both plot 1 and plot 2. In addition, two funnel traps were installed on each pit trap. A synopsis of related data packages which have been collected as part of the Three Park Savanna Fire-effects Plot Network’s full program is provided at http://www.ltern.org.au/index.php/ltern-plot-networks/three-parks-savanna