Arid
DOI10.1111/j.1654-109X.2011.01173.x
A first formal classification of the Hardeveld vegetation in Namaqualand, South Africa
Luther-Mosebach, Jona1,2; Dengler, Juergen2; Schmiedel, Ute2; Roewer, Inga Ute1,2; Labitzky, Timo1; Groengroeft, Alexander1
通讯作者Luther-Mosebach, Jona
来源期刊APPLIED VEGETATION SCIENCE
ISSN1402-2001
出版年2012
卷号15期号:3页码:401-431
英文摘要

Questions The Succulent Karoo is a winter-rainfall desert in southern Africa with a highly diverse flora. Which environmental factors differentiate vegetation composition at the plot level: How can compositional pattern be best represented by a formal phytosociological classification. Location Soebatsfontein communal area and surroundings in the Namaqualand Hardeveld Bioregion of the Succulent Karoo Biome, Northern Cape Province, South Africa. Methods We recorded vascular plant species composition, together with a range of structural and soil parameters as well as grazing intensity, in 355 plots of 100 m2 size. This sample covered all vegetation types of the study area except those of river beds and anthropogenic sites. Vegetation classification was carried out using modified TWINSPAN followed by manual re-arrangement of a subset of plots with the aim of increasing floristic distinctiveness of the vegetation units. For the final vegetation units, we determined diagnostic species and environmental parameters, according to phi-values and ANOVA, respectively, and translated these into a phytosociological classification. Results The major factor influencing species composition and richness was soil salinity. At a broad scale, the less saline sites could be differentiated into sandy plains and rocky hills, and the saline sites into quartz fields, the centres of heuweltjies (termitaria) and the matrix between. We translated these patterns into two phytosociological classes with four orders, six alliances and 16 associations. Most of the syntaxa are very well defined in floristic terms, and all except the Othonnion cylindricae are new to science. The Hermannio trifurcae-Zygophylletea morgsanae represents the zonal vegetation of marginally saline soils, the Didelto carnosae-Cephalophylletea inaequalis the vegetation of saline soils. The vegetation of the extremely saline quartz patches probably belongs to a third class not described here due to the scarcity of representative plots. Conclusions Our phytosociological approach allowed the various degrees of ecological and floristic similarity to be represented by syntaxa of different ranks. A comparison with previous classifications from the Succulent Karoo revealed a high spatial turnover, with only two of our alliances and none of our associations coinciding with those found in previously studied areas of the Succulent Karoo. Our formal classification has the potential to be a powerful tool for local land use, ecological comparison and conservation, and to contribute to a future national phytosociological classification of South Africa.


英文关键词Biodiversity Desert Didelto carnosae-Cephalophylletea inaequalis Grazing intensity Hermannio trifurcae-Zygophylletea morgsanae Heuweltjie Phytosociology Quartz field Releve Soil condition Succulent Karoo Syntaxonomy Termitarium TWINSPAN Winter rainfall
类型Review
语种英语
国家Germany
收录类别SCI-E
WOS记录号WOS:000305936800011
WOS关键词WINTER-RAINFALL DESERT ; NORTH-WEST PROVINCE ; ORANGE-FREE-STATE ; SUCCULENT KAROO ; PLANT DIVERSITY ; MUNICIPAL AREA ; QUARTZ-FIELDS ; CAPE PROVINCE ; MOUNDS ; BIODIVERSITY
WOS类目Plant Sciences ; Ecology ; Forestry
WOS研究方向Plant Sciences ; Environmental Sciences & Ecology ; Forestry
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/171284
作者单位1.Univ Hamburg, Inst Soil Sci, D-20146 Hamburg, Germany;
2.Univ Hamburg, Bioctr Klein Flottbek Bot Garden, D-22609 Hamburg, Germany
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Luther-Mosebach, Jona,Dengler, Juergen,Schmiedel, Ute,et al. A first formal classification of the Hardeveld vegetation in Namaqualand, South Africa[J],2012,15(3):401-431.
APA Luther-Mosebach, Jona,Dengler, Juergen,Schmiedel, Ute,Roewer, Inga Ute,Labitzky, Timo,&Groengroeft, Alexander.(2012).A first formal classification of the Hardeveld vegetation in Namaqualand, South Africa.APPLIED VEGETATION SCIENCE,15(3),401-431.
MLA Luther-Mosebach, Jona,et al."A first formal classification of the Hardeveld vegetation in Namaqualand, South Africa".APPLIED VEGETATION SCIENCE 15.3(2012):401-431.
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