Modelling the effects of human activity on the vegetation of a northeast Mediterranean island
Modelling the effects of human activity on the vegetation of a northeast Mediterranean island
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模拟人类活动对地中海东北部岛屿植被的影响
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
J. Pantis
中科院分区：
文献类型：
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作者：
J. Tzanopoulos;J. Mitchley;J. Pantis
摘要问题：哪些因素会影响红树林和沼泽植被的空间变化，以及如何通过退化模型来估计人类活动的作用。地点：希腊基克拉迪群岛锡夫诺斯岛。方法：通过野外调查，收集了森林植被、环境条件和人类活动强度等资料。使用TWINSPAN分析了植被数据。基于典型变量分析和逻辑回归相结合的模型被用来检查和描述不同的降解途径。结果：植被的空间变异与环境因子和干扰因子有关。沼泽植被对阔叶林的替代可以遵循两种不同的途径，反映了环境条件的差异。然而，路径本身仅由干扰的组合和水平决定。结论：退化模型可以为研究人类活动对植被的影响提供必要的信息。阔叶林植被对干扰具有较强的耐受性，但当干扰超过一定的临界阈值时，阔叶林将被杂木林植被所取代。沼泽植被的出现并不总是红树林退化的结果。命名：Tendon et al.（1964-1980）。缩略语：CA =对应分析; CVA =典型变量分析;相VJ 1和VJ 2 =刺柏群落的亚群，其中VJ 1的特征在于经常存在糙苏，VJ 2的特征在于经常存在阿月浑子和毛萼木; VP 1、VP 2和VP 3相= Sarcopoterium spinosum phryganic群落的亚群，其中VP 1的特征在于恒定存在Coridothymus capitatus，Calicotome villosa和阿月浑子lentiscus，VP 2由Phlomis fruticosa的恒定存在和VP 3由Sarcopoterium spinosum的优势。
Abstract Question: Which factors affect the spatial variation of maquis and phryganic vegetation and how can the role of human activities be estimated through degradation models. Location: Island of Sifnos, Cyclades, Greece. Methods: Data on woody vegetation, environmental conditions and intensity of human activity were collected by field survey. The vegetation data were analysed using TWINSPAN. Models based on the combination of Canonical Variate Analysis and logistic regressions were used in order to examine and describe the different pathways of maquis degradation. Results: The spatial variation of maquis and phryganic vegetation was related to both environmental and disturbance factors. The replacement of maquis by phryganic vegetation can follow two different pathways which reflect differences on the environmental conditions. However, the pathways themselves are determined by the combinations and levels of disturbance only. Conclusion: Degradation models can provide essential information on the effects of human activities on the vegetation. Maquis vegetation is relatively tolerant of disturbance, however, if disturbance exceeds certain critical thresholds, maquis is replaced by phryganic vegetation. The presence of phryganic vegetation is not always the result of maquis degradation. Nomenclature: Tutin et al. (1964–1980). Abbreviations: CA = Correspondence Analysis; CVA = Canonical Variate Analysis; Facies VJ1 and VJ2 = subdivisions of Juniperus phoenicea maquis community with VJ1 characterized by constant presence of Phlomis fruticosa and VJ2 by constant presence of Pistacia lentiscus, and Calicotome villosa; Facies VP1, VP2 and VP3 = subdivision of Sarcopoterium spinosum phryganic community with VP1 characterized by constant presence of Coridothymus capitatus, Calicotome villosa and Pistacia lentiscus, VP2 by constant presence of Phlomis fruticosa and VP3 by dominance of Sarcopoterium spinosum.