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首页> 外文期刊>Conservation Biology >Effects of Harvest of Nontimber Forest Products and Ecological Differences between Sites on the Demography of African Mahogany
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Effects of Harvest of Nontimber Forest Products and Ecological Differences between Sites on the Demography of African Mahogany

机译：非木材林产品的采伐和站点间生态差异对非洲桃花心木人口统计学的影响

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The demographic impacts of harvesting nontimber forest products (NTFP) have been increasingly studied because of reports of potentially unsustainable harvest. Nevertheless, our understanding of how plant demographic response to harvest is altered by variation in ecological conditions, which is critical for developing realistic sustainable-use plans, is limited. We built matrix population models to test whether and how variation in ecological conditions affects population responses to harvest. In particular, we examined the effect of bark and foliage harvest on the demography of populations of African mahogany (Khaya senegalensis) in two contrasting ecological regions of Benin, West Africa. K. senegalensis bark and foliage harvest significantly reduced its stochastic population growth rates, but ecological differences between regions had a greater effect on population growth rates than did harvest. The effect of harvest on population growth rates (Delta lambda) was slightly stronger in the moist than in the drier region. Life-table response experiments revealed that the mechanism by which harvesting reduced. differed between ecological regions. Lowered stasis (persistence) of larger life stages lead to a reduction in. in the drier region, whereas lowered growth of all life stages lowered. in moist region. Potential strategies to increase population growth rates should include decreasing the proportion of individuals harvested, promoting harvester-owned plantations of African mahogany, and increasing survival and growth by promoting no-fire zones in gallery forests. Our results show how population responses to harvest of NTFP may be altered by ecological differences across sites and emphasize the importance of monitoring populations over the climatic range in which they occur to develop more realistic recommendations for conservation.
机译：由于报道了潜在的不可持续的采伐，越来越多地研究了采伐非木材林产品（NTFP）对人口的影响。然而，我们对植物人口对收获的反应如何因生态条件的变化而改变的理解是有限的，这对于制定现实的可持续利用计划至关重要。我们建立了矩阵种群模型，以测试生态条件的变化是否以及如何影响种群对收获的反应。特别是，我们检查了树皮和树叶收成对西非贝宁两个相反的生态区域中非洲桃花心木（Khaya senegalensis）人口的人口统计学影响。塞内加尔K.塞内加尔树皮和观叶植物的收获大大降低了其随机种群的增长率，但是区域之间的生态差异对种群增长率的影响大于收获。潮湿地区的收成对人口增长率（λλ）的影响略强于干旱地区。生命表响应实验表明，收获的机制减少了。生态区域之间存在差异。较大生命阶段的滞留（持续性）降低导致较干燥区域的减少，而所有生命阶段的生长降低均降低了。在潮湿的地区。增加人口增长率的潜在策略应包括减少被采伐者的比例，促进非洲红木的收割者拥有的人工林，以及通过促进长廊森林的禁火区来提高生存和增长。我们的研究结果表明，不同地点之间的生态差异可能会改变人口对NTFP采收的反应，并强调监测气候发生范围内的种群以制定更现实的保护建议的重要性。

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