A phytosociology survey and vegetation description of inselbergs in the uKhahlamba-Drakensberg Park World Heritage Site, South Africa
A phytosociology survey and vegetation description of inselbergs in the uKhahlamba-Drakensberg Park World Heritage Site, South Africa
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南非 uKhahlamba-Drakensberg 公园世界遗产地岛山的植物社会学调查和植被描述
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
P. D. Preez
中科院分区：
文献类型：
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作者：
R. Brand;N. Collins;P. D. Preez
此前尚未对德拉肯斯堡的岛屿进行过科学调查。本研究的目的是收集标本，识别、描述和命名植被簇，并评估与其他非洲山区的生物地理联系。总共 103 个相关样本是从 6 个岛屿中采样的。植物采样是根据 Braun-Blanquet 方法进行的，植物和环境数据输入 TURBOVEG 中，并以 Cornell Condensed 格式文件 (CC!) 导出到 Juice 中。使用TWINSPAN（双向指示物种分析）（修改）完成分类，产生4个主要群落、11个群落、13个亚群落和18个变种。使用 CANOCO（4.5 版）进行排序（间接）来研究物种之间的关系。确定的四个主要群落是Rhodohypoxis rubella（湿地草和阔叶草）、Scirpus ficinioides – Crassula peploides（板状岩草和阔叶草）、Pentaschistis exserta（高海拔高山草原）（以前未曾描述过）和Merxmuellera drakensbergensis – Helichrysum trilineatum（高海拔高山凡波斯草原）（在其他植被中描述过）和植物区系研究。确定了湿地、片岩浅土、高海拔高山草原和深土高海拔凡波斯草原四种生境。基质和水分可用性似乎是决定不同植被群的微气候条件，而海拔是影响所有植被的首要环境因素。保护影响：二氧化碳增加导致气温上升，预计将大幅减少特有和近特有山地物种的数量，同时改变构成高山植被的植被单元的组成。
No previous scientific surveys have been conducted on inselbergs in the Drakensberg. The aim of this study was to collect specimens, identify, describe and name the vegetation clusters and assess biogeographical connections with other Afromontane regions. A total of 103 releves where sampled from six inselbergs. The plant sampling was carried out according to the Braun-Blanquet method with the plant and environmental data entered in TURBOVEG and exported as a Cornell Condensed format file (CC!) into Juice. Classification was completed using TWINSPAN (Two-way Indicator Species Analysis) (modified), resulting in 4 major communities, 11 communities, 13 sub-communities and 18 variants. Ordination (indirect) was carried out using CANOCO (version 4.5) to investigate the relationship between species. The four major communities identified are Rhodohypoxis rubella (wetland grass and forblands), Scirpus ficinioides – Crassula peploides (sheet rock grass and forblands), Pentaschistis exserta (high-altitude alpine grassland), previously undescribed, and Merxmuellera drakensbergensis – Helichrysum trilineatum (high-altitude alpine fynbos grassland), described in other vegetation and floristic studies. Four habitats were identified, namely wetlands, sheet rock shallow soil, highaltitude alpine grassland and deep soil high-altitude fynbos grasslands. Substrate and moisture availability appeared to be the defining micro-climatic conditions determining the different vegetation clusters whilst altitude is the overriding environmental factor influencing all vegetation. Conservation implications: Rising temperatures as a result of carbon dioxide increase is predicted to drastically decrease the number of endemic and near-endemic montane species, whilst altering the composition of vegetation units which comprise the alpine vegetation.