Recovery of conservation values in Central African rain forest after logging and shifting cultivation
Recovery of conservation values in Central African rain forest after logging and shifting cultivation
复制标题
中非雨林采伐和轮耕后保护价值的恢复
DOI：
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发表时间：
2003
影响因子：
3.4
通讯作者：
H. Olff
中科院分区：
文献类型：
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作者：
Barend S. Van Gemerden;G. N. Shu;H. Olff
中部非洲的次生林对于生物多样性保护的重要性日益增加，因为少数保护区之外的原始森林正在迅速消失。我们根据对原始森林和不同年龄采伐间隙（5-27 年）和轮耕田（10-60 年）的详细植物学调查，研究了喀麦隆低地雨林地区的植被恢复情况。我们的分析重点是通过分析植被结构、物种组成、物种多样性以及特有性和稀有性水平的趋势，重点关注植物保护价值的长期恢复。在总调查（4.25 公顷）中，我们记录了 834 个物种，其中 23% 是下几内亚森林地区特有的物种。特有物种比例以灌木高、草本低为主。地理范围和（当地）稀有度没有显着相关。木本攀缘植物中稀有物种的比例（相对频率<10%）较高，而乔木中的比例较低。在伐木间隙，所有植被特征的恢复相对较快（5-14 年）。轮耕地的恢复需要更长的时间（30-60 年）。研究发现，特有物种对轮耕方式高度敏感，即使在 50-60 年后，与原始森林相比，特有物种的水平仍然明显较低。受干扰地点和原始森林之间稀有物种的比例没有显着差异。我们的结论是，次生林可以促进生物多样性保护，例如作为保护区周围的缓冲区。然而，对于土地利用类型以及广泛分布和特有物种之间的这种贡献应该进行不同的评估。
Secondary forests in Central Africa are increasing in importance for biodiversity conservation as old growth forests outside the few protected areas are disappearing rapidly. We examined vegetation recovery in a lowland rain forest area in Cameroon based on a detailed botanical survey of old growth forest and different-aged logging gaps (5–27 years) and shifting cultivation fields (10–60 years). Our analysis focuses on the long-term recovery of botanical conservation values by analysing trends in vegetation structure, species composition, species diversity and levels of endemism and rarity. In the total survey (4.25 ha), we recorded 834 species of which 23% were endemic to the Lower Guinea forest region. The proportion of endemic species was high in shrubs and low in herbs. Geographic range and (local) rarity were not significantly associated. The proportion of rare species (relative frequency <10%) was high in woody climbers and low in trees. In logging gaps, recovery of all vegetation characteristics was relatively quick (5–14 years). Recovery in shifting cultivation sites took longer (30–60 years). Endemic species were found to be highly sensitive to shifting cultivation practices and even after 50–60 years the level of endemism was still significantly lower compared to old growth forest. The proportion of rare species was not significantly different between disturbed sites and old growth forest. We conclude that secondary forests can contribute to biodiversity conservation, e.g. as buffer zones around protected areas. However, this contribution should be assessed differently between land use types and widespread versus endemic species.