Gradients of continentality and moisture in South Patagonian ombrotrophic peatland vegetation
Gradients of continentality and moisture in South Patagonian ombrotrophic peatland vegetation
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南巴塔哥尼亚浅营养泥炭地植被的大陆性和水分梯度
DOI：
10.1007/bf02861700
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发表时间：
2007
影响因子：
1.2
通讯作者：
A. Vogel
中科院分区：
文献类型：
--
作者：
T. Kleinebecker;N. Hölzel;A. Vogel
这项研究提出了381植物社会学relevés的分析，主要描述了雨养型南巴塔哥尼亚低地泥炭地植被沿着梯度的大陆性增加。数值方法，如聚类分析和去趋势对应分析（DCA）进行了探索的数据集。聚类分析结果表明，9个植被类型也明显分开DCA排序。沿着DCA第一轴的主要植物群群落斜带反映了从以垫状植物为主的太平洋毯状沼泽到以泥炭藓为主的大陆隆起沼泽的大陆性梯度。增加大陆性沿着第一轴是平行的泥炭分解减少，泥炭深度和酸度增加。相反，植物区系的变化沿着第二DCA轴代表了一个水位gradient.The典型的序列植被类型沿着沿空心丘的水分梯度，这是很好地建立了北半球泥炭地也可以观察到在泥炭藓为主的南巴塔哥尼亚提出沼泽与一个令人惊讶的相似性在植物区系和结构特征。关于大陆性的梯度，与北方相比，可以确定有重大差异。最明显的是垫建筑植物（如Astelia pumila，Donatia fascicularis）在南巴塔哥尼亚海洋泥炭地的优势，而这种生命形式是完全没有在北方。与大陆泥炭藓沼泽相似，超海洋泥炭地的垫状植物植被在水分梯度上沿着表现出明显的分离。
This study presents the analysis of 381 phytosociological relevés describing predominantly ombrotrophic South Patagonian lowland peatland vegetation along a gradient of increasing continentality. Numerical methods such as cluster analysis and detrended correspondence analysis (DCA) were carried out to explore the data set. Cluster analysis resulted in nine vegetation types that were also distinctly separated in DCA ordination. The major floristic coenocline along the first DCA axis reflected a gradient of continentality ranging from pacific blanket bogs dominated by cushion plants toSphagnum-dominated continental raised bogs. Increasing continentality along the first axis was parallel with decreasing peat decomposition and increasing peat depth and acidity. In contrast, floristic variation along the second DCA axis represented a water level gradient.The typical sequence of vegetation types along the hollow-hummock moisture gradient that is well established for north hemispherical peatlands could also be observed inSphagnum-dominated South Patagonian raised bogs with a surprising similarity in floristic and structural features. Concerning the gradient of continentality significant differences in comparison with the northern hemisphere could be established. Most obvious was the dominance of cushion building plants (e.g.Astelia pumila, Donatia fascicularis) in South Patagonian oceanic peatlands, whereas this life form is totally absent from the northern hemisphere. Similar to the continentalSphagnum bogs the cushion plant vegetation of hyperoceanic peatlands exhibited a clear separation along the moisture gradient.