The phytogeography of moist forests across Eastern Zimbabwe
The phytogeography of moist forests across Eastern Zimbabwe
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津巴布韦东部潮湿森林的植物地理学
DOI：
10.5091/plecevo.2021.1814
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发表时间：
2021
影响因子：
1.1
通讯作者：
T. Muller
中科院分区：
文献类型：
--
作者：
J. Timberlake;F. Dowsett;T. Muller
背景和目的-在20世纪70年代，对津巴布韦东部高地的潮湿森林地区进行了全面调查，从北部的尼扬加到南部的奇林达森林。在176个四分之一公顷的样地中，测量了冠层和亚冠层中所有直径大于8cm的树干，并将样地划分为12种与海拔相关的森林类型。本研究的目的是对这些样地记录的木本物种进行分类。这些发现与马拉维潮湿森林的类似分析进行了比较。材料和方法-在最初调查中记录的所有树种都被列出，并根据其大陆分布将其分为12个描述的时间（植物地理）类别。给出了它们在前面描述的12种森林类型中的发生情况。主要结果与结论：在176个样地共记录到211种树种。大多数种（86种，40.8%）为非洲山区特有或近特有，48种（22.7%）为几内亚-刚果联种，31种（14.7%）为东部特有或近特有，16种（7.6%）为亚非洲山区特有或近特有。其余的包括非洲连种和赞比西亚种。这表明津巴布韦东部潮湿森林的物种形成了一个复杂的植物地理组合。虽然非洲山区物种在高海拔地区占主导地位，但几内亚-刚果和东部物种在低海拔地区更为常见。就年代分类的比例而言，发现结果与马拉维森林研究的结果相似。
Background and aims – During the 1970s, a comprehensive survey of moist forest areas across Zimbabwe’s Eastern Highlands was carried out, from Nyanga in the north to Chirinda Forest in the south. All tree stems 8 cm diameter or greater in both canopy and sub-canopy layers were measured in 176 quarter-hectare plots, and plots were then classified into 12 altitude-related forest types. The aim of the present study is to categorise the woody species recorded in these plots in terms of their chorological status. The findings are compared to similar analyses from moist forests across Malawi.Material and methods – All tree species recorded during the initial survey were listed and placed into 12 described chorological (phytogeographical) categories based on their continental distribution. Their occurrence across the 12 previously described forest types is given. Key results and conclusions – A total of 211 tree species was recorded from 176 plots. Most species (86, or 40.8%) are Afromontane endemics or near-endemics, while 48 species (22.7%) are Guineo-Congolian linking, 31 (14.7%) are Eastern endemic or near-endemics, and 16 (7.6%) are sub-Afromontane endemics or near-endemics. The remainder comprise African linking and Zambezian species. This shows that species of the moist forests of eastern Zimbabwe form a complex phytogeographical mix. While Afromontane species dominate at high altitudes, Guineo-Congolian and Eastern species become more common at lower altitudes. In terms of proportions of chorological categories, results were found to be similar to those from forest studies in Malawi.