CLIMATIC CONDITIONS, VEGETATION TYPES, AND LEAF SIZE IN THE GALAPAGOS ISLANDS
CLIMATIC CONDITIONS, VEGETATION TYPES, AND LEAF SIZE IN THE GALAPAGOS ISLANDS
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DOI：
10.2307/2387785
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发表时间：
1979-01-01
期刊：
影响因子：
2.1
通讯作者：
HAMANN, O
中科院分区：
文献类型：
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作者：
HAMANN, O
对加拉帕戈斯群岛[厄瓜多尔]10个岛屿的植被研究表明，从沙漠灌丛到常绿森林，各种植被类型的分布模式与当地气候条件的模式变化密切相关。植物群落和不同层间平均叶片大小的变化与海拔和暴露程度的变化以及群落结构的变化有关。植物群落的平均叶片大小被认为是分类植被类型的一个有用的诊断特征。植物群落的结构特征，如层积和盖度，会影响同一群落内下层的叶片大小。灌木和草本层叶片大小的变化与其上一层覆盖度的变化有关。果胶复合体和巴豆叶片大小的变化可能与群落结构的变化有关。植物群落结构可能对棘果和巴豆施加了选择压力，使它们发育出最适合其特定环境要求的叶片大小。
Vegetation studies on 10 islands in the Galapagos [Ecuador] demonstrate that the distribution pattern of various vegetation types, from desert scrub to evergreen forest, is closely associated with the pattern variety in local climatic conditions. Variation in average leaf size of plant communities and of different layers in the communities is associated with altitude and exposure variations and with variations in community structure. Average leaf size of a plant community is considered a useful diagnostic feature for classifying the vegetation types. Structural features of the plant communities, for example, stratification and coverage, influence leaf size of lower layers within the same community. Variation in leaf size of the shrub and herb layer is associated with variation in coverage of the layer above. Leaf size variation in the Acalypha complex and in Croton scouleri may be related to structural variations in the communities. Structure of plant communities may impose selection pressure on the Acalypha and Croton species, causing them to develop the leaf size optimally fitted for requirements of their particular environment.