Floristics and biogeography of vegetation in seasonally dry tropical regions
Floristics and biogeography of vegetation in seasonally dry tropical regions
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DOI：
10.1505/146554815815834859
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发表时间：
2015-01-01
影响因子：
1.6
通讯作者：
Pennington, R. T.
中科院分区：
文献类型：
--
作者：
Dexter, K. G.;Smart, B.;Pennington, R. T.
为了提供对干旱适应的热带植被形成的植物区系学和植物地理学的洲际概述，我们编制了南美洲（n = 93），非洲（n = 84）和亚洲（n = 92）的热带稀树草原（受火灾影响），季节性干燥的热带森林（一般不受火灾影响）和潮湿的森林（无火灾）的库存地块数据集。我们分析了大陆内部和大陆之间植被形成的植物区系相似性。我们的数据集强烈表明，不同的地层往往是强烈的集群，植物区系的大陆，和大陆，表面上相似的植被形成（如稀树草原）是植物区系高度不同。新热带湿润森林、稀树草原和季节性干燥热带森林在植物区系上是不同的，但在其他地方，稀树草原和季节性干燥热带森林没有明确的植物区系划分，尽管湿润和干燥的地层是分开的。我们认为，由于其燃烧的倾向，在非洲和亚洲被称为“干燥森林”的许多地层最好被视为稀树草原。来自不同大陆的类似植被形成的植物区系差异表明，跨大陆的热带稀树草原和季节性干燥热带森林的生态，生物和保护的概括可能是困难的。
To provide an inter-continental overview of the floristics and biogeography of drought-adapted tropical vegetation formations, we compiled a dataset of inventory plots in South America (n=93), Africa (n=84), and Asia (n=92) from savannas (subject to fire), seasonally dry tropicalforests (not generally subject to fire), and moist forests (no fire). We analysed floristic similarity across vegetation formations within and between continents. Our dataset strongly suggests that different formations tend to be strongly clustered-floristically by continent, and that among-continents, superficially similar vegetation formations (e.g. savannas) are floristically highly dissimilar. Neotropical moist forest, savanna and seasonally dry tropical forest are floristically distinct, but elsewhere there is no clear floristic division of savanna and seasonally dry tropical forest, though moist and dry formations are separate. We suggest that because of their propensity to burn, many formations termed "dry forest" in Africa and Asia are best considered as savannas. The floristic differentiation of similar vegetation formations from different continents suggests that cross-continental generalisations of the ecology, biology and conservation of savannas and seasonally dry tropical forests may be difficult.