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- W936248627 abstract "Widespread clearing of Tasmanian heathland for pasture and crops has resulted in smallremnants within the agricultural landscape. The conventional wisdom has been that suchsmall remnants are susceptible to adverse edge effects, particularly those related tonutrient accession, and thus are not worth conserving. Previous research into the addition ofnutrients in heathlands has involved large amounts of fertiliser. In this thesis realisticexperimental manipulation in the field and widespread observation of boundaries are usedto determine whether there could be a future for small heath remnants.The effects of irrigating a coastal heathy woodland with sewage water were monitored.The addition of small amounts of nutrients in the wastewater caused a small increase inlive plant cover but no major plant death or changes in species composition. In amanipulative field experiment, small amounts of fertilisers were added to simulatenutrient drift from pasture topdressing, and were combined with fire and weed seedtreatments. There were no effects on cover, species richness and species composition. In asecond manipulative field experiment, fire-fighting foam was applied in combinationwith burning. Foam effects included increases and decreases in canopy growth of differentspecies, a reduction in species richness, reduced flowering and leaf damage. In all threeexperiments, exotic species either did not invade over the period of the study or, whenweed seeds were sown, failed to establish. In a survey, the observations of heath—pastureboundaries showed that different management regimes affected the condition of coastalheath remnants. The major disturbance that encouraged weed invasion in heathlands wasan increase in soil fertility. Stock grazing, native herbivore grazing and physicaldisturbance also adversely affected heath condition. However, edge effects in the form ofincreased nutrients and the presence of exotic species did not penetrate more than a fewmetres into heathland. In summary, with careful management, small heathland remnantscan be quite resistant to weed invasion and are worth conserving." @default.
- W936248627 created "2016-06-24" @default.
- W936248627 creator A5029025532 @default.
- W936248627 date "2003-01-01" @default.
- W936248627 modified "2023-09-27" @default.
- W936248627 title "The impacts of edge effects and other disturbances on Tasmanian coastal heathlands" @default.
- W936248627 hasPublicationYear "2003" @default.
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