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dc.contributor.authorLarkin, D.T.
dc.date.accessioned2015-03-31T11:23:49Z
dc.date.available2015-03-31T11:23:49Z
dc.date.created2014en
dc.date.issued2015-03-31T11:23:49Z
dc.identifier.urihttp://hdl.handle.net/123456789/1689
dc.descriptionFunded by DST-NRF Centre of Excellence for Invasion Biologyen
dc.description.abstractThere have been very few studies on the impacts of Acacia melanoxylon on the environmental conditions in forest communities in South Africa. The aim of this study was to determine the effects of this exotic species on the environmental conditions within forest communities in Harkerville forest, located between Knysna and Plettenberg Bay in South Africa. The effects on the nutrient, moisture and organic content of the soil were studied, as well as the effects on canopy closure and the light penetration to the forest floor. In addition, potential sources of invasion were also identified in the area. It was determined that blackwood did not influence the moisture and organic matter content of the soil, it did however affect the phosphorus and ammonia content. Phosphorus was found to be significantly lower in the vicinity of the blackwood trees. The soil nitrate concentration was significantly higher. Canopy closure was significantly reduced in the invaded areas, which had resulted in a significant increase in light penetration to the forest floor. This was attributed to blackwood's preference for open areas. Major sources of blackwood seed identified in the area, were a very dense stand of blackwood on private land and blackwood plantations in the area. The phytosociology was determined not to be different between the invaded and non-invaded. The study determined that the blackwood altered the tree layer by reducing the number of tree species that comprise the layer. It was concluded that blackwood had minimal impact of the on the environmental conditions measured. Even though the differences in the environmental conditions measured were significant, they were slight. The major issue identified was the dispersal of seeds from nearby sources . Fortunately the seeds do not germinate readily under the closed canopies in the forest. Management and monitoring of blackwood trees is prominent in the area, the adult blackwood trees are ring-barked and the seedlings removed within the vicinity of water courses.en
dc.description.statementofresponsibilityAdministrator
dc.format.extent53881 bytes
dc.format.extent1579889 bytes
dc.format.mimetypeapplication/vnd.ms-excel
dc.format.mimetypeapplication/pdf
dc.languageEnglishen
dc.language.isoen_US
dc.rightscopyrighten
dc.subjectAcacia melanoxylonen
dc.subjectBlackwooden
dc.subjectphytosociologyen
dc.subjectHarkerville foresten
dc.titleImpacts of Acacia melanoxylon R.Br. (blackwood) on the environmental conditions and phytosociology in forest communities in Harkerville forest, South Africaen
dc.mdidentification.purposeSubmitted in partial fulfilment of the requirements of the degree of BACCALAUREUS SCIENTIAE HONORES Faculty of Science, Nelson Mandela Metropolitan University, Port Elizabethen
dc.mdidentification.organizationnameCentre of Excellence for Invasion Biologyen
dc.mdidentification.deliverypointFaculty of Science, Natural Sciences Building, Private Bag X1, Stellenbosch University, Matielanden
dc.mdidentification.postalcode7602en
dc.mdidentification.phone0218082832en
dc.mdidentification.electronicmailaddresskcd@sun.ac.zaen
dc.mddataidentification.languageEnglishen
dc.mdusage.usagedatetime2014-11
dc.mdlegalconstraints.accessconstraintscopyrighten
dc.dqcompletenessomission.valueunitPercentageen
dc.dqcompletenessomission.valueattributedata100en
dc.mdmaintenanceinformation.maintenanceandupdatefrequencyWhen_neededen
dc.mdfeaturecataloguedescription.cataloguedate2015-03-31
dc.mddistributor.distributorcontactCentre for Invasion Biologyen
dc.mdformat.nameMS Excel spreadsheeten
dc.mdformat.version2014en
dc.exgeographicboundingbox.westboundlongitude23° 8'16.09"Een
dc.exgeographicboundingbox.eastboundlongitude23°14'35.70"Een
dc.exgeographicboundingbox.northboundlattitude34° 2'1.04"Sen
dc.exgeographicboundingbox.southboundlattitude34° 4'53.17"Sen
dc.exverticalextent.minimumvalue25en
dc.exverticalextent.maximumvalue282en
dc.exverticalextent.unitofmeasuremetersen
dc.cibprojectNAen


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