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首页> 外文期刊>Journal of Vegetation Science >Floristic diversity of an eastern Mediterranean dwarf shrubland: the importance of soil pH
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Floristic diversity of an eastern Mediterranean dwarf shrubland: the importance of soil pH

机译：地中海东部矮灌木丛的植物区系：土壤pH值的重要性

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QuestionsDoes plant species richness and composition of eastern Mediterranean dwarf shrubland (phrygana) correlate with soil pH? How important is the effect of pH on species diversity in relation to other environmental factors in this ecosystem? What is the evolutionary background of the diversity-pH relationship?LocationWestern Crete, Greece.MethodsSpecies composition of vascular plants, soil and other environmental variables were sampled in 100-m2 plots on acidic and basic bedrock in phrygana vegetation. The relationships between species composition and environmental variables (including climate) were tested using canonical correspondence analysis, and relationships between species richness and environment using correlation and regression analyses. Data were analysed separately for different plant functional types based on life form and life span.ResultsAlthough soil pH varied across a narrow range (5.9-8.1), species composition changed significantly along the pH gradient within all plant functional types. For most functional types, the effect of soil pH on species composition was stronger than that of other environmental variables. Species richness of annuals, geophytes and suffruticose chamaephytes increased with soil pH, while richness of hemicryptophytes and shrubs was not correlated with pH.ConclusionsThe results are consistent with the evolutionary species pool hypothesis. High numbers of calcicole annuals, geophytes and suffruticose chamaephytes may be a result of the evolution of these groups on base-rich dry soils in the Mediterranean climate. In contrast, hemicryptophytes, a life form typical of the temperate zone, evolved on both acidic and basic soils and therefore their species numbers do not respond to soil pH across the narrow range studied. The lack of a relationship between shrub species richness and pH is difficult to explain: it may reflect the more diverse or older origin of Mediterranean woody species and their conservative niches.
机译：问题地中海东部矮灌木丛（phrygana）的植物物种丰富度和组成与土壤pH值相关吗？ pH值对物种多样性与生态系统中其他环境因素的关系有多重要？ pH多样性关系的演化背景是什么？地点：希腊克里特岛西部。方法在phrygana植被的酸性和碱性基岩上，对100平方米的样地进行维管植物物种组成，土壤和其他环境变量的采样。使用典范对应分析来检验物种组成与环境变量（包括气候）之间的关系，并使用相关和回归分析来检验物种丰富度与环境之间的关系。根据生命形式和寿命对不同植物功能类型的数据进行了单独分析。结果尽管土壤pH在狭窄的范围内（5.9-8.1）变化，但在所有植物功能类型中，物种组成均沿pH梯度发生了显着变化。对于大多数功能类型，土壤pH对物种组成的影响要强于其他环境变量。土壤的pH值与年生植物，地生植物和约瑟夫变种的物种丰富度相关，而半隐生植物和灌木的物种丰富度与pH值无关。结论与进化物种库假说相符。在地中海气候中，这些基团在富含碱的干燥土壤上的演化可能是大量的甲虫，年生植物和变种藻类植物。相反，半隐生植物是温带地区的典型生命形式，它在酸性和碱性土壤上均发生了进化，因此在所研究的狭窄范围内，它们的种类数对土壤pH值没有响应。灌木物种丰富度与pH值之间缺乏联系很难解释：这可能反映了地中海木本物种及其保守生态位的起源更加多样或更古老。

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