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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Vegetation ecology of the Soutpansberg and Blouberg area in the Limpopo Province

Mostert, T.H.C. (Theodorus Hendrik Cornelis) 16 March 2010 (has links)
The fast growing local human population, especially through immigration from countries north of South Africa, is placing the Soutpansberg and Blouberg areas under increasing pressure. The insatiable demand for more arable land within these agriculturally marginal and semi-arid areas is leading to severe degradation of the remaining natural resources. The Soutpansberg–Blouberg region has been recognized as a Centre of Endemism and is regarded as a region of exceptionally high biological diversity. The Soutpansberg Conservancy and the Blouberg Nature Reserve reveal extremely rich diversities of plant communities relative to the sizes of these conservation areas. The Major Vegetation Types and plant communities of the Soutpansberg Centre of Endemism are described in detail with special reference to the Soutpansberg Conservancy and the Blouberg Nature Reserve. Phytosociological data from 466 sample plots were ordinated using a Detrended Correspondence Analysis (DECORANA) and classified using Two–way Indicator Species Analysis(TWINSPAN). The resulting classification was further refined with table–sorting procedures based on the Braun–Blanquet floristic–sociological approach of vegetation classification using MEGATAB. Eight Major Vegetation Types were identified and described as Eragrostis lehmanniana var. lehmanniana–Sclerocarya birrea subsp. caffra BNR Northern Plains Bushveld, Euclea divinorum–Acacia tortilis BNR Southern Plains Bushveld, Englerophytum magalismontanum–Combretum molle BNR Mountain Bushveld, Adansonia digitata–Acacia nigrescens Soutpansberg Arid Northern Bushveld, Catha edulis–Flueggia virosa Soutpansberg Moist Mountain Thickets, Diplorhynchus condylocarpon–Burkea africana Soutpansberg Leached Sandveld, Rhus rigida var. rigida–Rhus magalismontanum subsp. coddii Soutpansberg Mistbelt Vegetation and Xymalos monospora–Rhus chirendensis Soutpansberg Forest Vegetation. Plant communities of each of the Major Vegetation Types are described. The primary ecological drivers of the event-driven and the classic climax vegetation types are discussed and management recommendations are made for effective conservation of these last remaining pockets of wilderness. The available data supports the recognition of the region as an important Centre of Plant Endemism and Biological Diversity requiring conservation attention. Copyright / Thesis (PhD)--University of Pretoria, 2010. / Plant Science / unrestricted
2

Beiträge zur Vegetation Sachsens: Molinietalia caeruleae und Arrhenatheretalia elatioris - Wirtschaftsgrünland ohne Kriech- und Flutrasen

Böhnert, Wolfgang, Kleinknecht, Uta, Richter, Frank, Wendel, Dirk 12 September 2023 (has links)
Ziel der vorliegenden Forschungsarbeit ist es, eine Übersicht der Pflanzengesellschaften Sachsens vorzulegen. Dabei wird zunächst ein grundsätzliches syntaxonomisches Konzept zur Bearbeitung der Vegetation Sachsens vorgestellt. Inhalt des vorliegenden ersten Heftes ist die Klasse der Molinio-Arrhenatheretea (Kulturgrasland aus Fettwiesen und Fettweiden, jedoch ohne Kriech- und Flutrasen). Die Pflanzengesellschaften werden durch Referenztabellen und Texte in ihrer Vielfalt mit wichtigen regionalen und standörtlichen Ausprägungen in prägnanter Weise beschrieben. Grundlage sind ca. 3000 syntaxonomisch bearbeitete Vegetationsaufnahmen. Die Übersicht ist so strukturiert, dass sie sowohl mit der - bislang ausschließlich in Textform vorliegenden - Rote Liste der Pflanzengesellschaften Sachsens (BÖHNERT et al. 2021) als auch mit dem sächsischen Kartier- und Bewertungsschlüssel für FFH-Lebensraumtypen (LFULG 2009), dessen Erfassungskriterien wesentlich auf der Zuordnung zu Pflanzengesellschaften beruhen, verglichen werden kann. Bei der Formulierung der deutschen Namen der Syntaxa wurden die Vorschläge von KORNECK (1984) berücksichtigt, die auf den Ebenen von Assoziationen und Verbänden zu Veränderungen gegenüber BÖHNERT et al. (2021) führten. Die Übersicht soll den Kartierern des Langzeitmonitoring der FFH-Lebensraumtypen in Sachsen als informative Handreichung zum Kartier- und Bewertungsschlüssel zur Verfügung gestellt werden. Darüber hinaus wird ein breiter Nutzerkreis im Bereich Biologie und Naturschutz angesprochen. / The aim of the present research work is to present an overview of the plant communities in Saxony. Therefor a basic syntaxonomic concept for processing the vegetation of Saxony is presented. This issue also presents a reviewed classification of Molinio-Arrhenatheretea (without flood and creeping swards). The plant communities are described by reference tables and texts to show their diversity and important regional and local characteristics. The work is based on more than 3000 syntaxonomic relevés. The classification allows a comparison with the Red List of Plant Communities in Saxony (BÖHNERT et al. 2021) and with the Saxon mapping and assessment key for FFH habitat types (LfULG 2009). The results support the recognition and mapping of FFH-habitats. The publication adresses a wide range of users in the field of biology and nature conservation.

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