Population structure and regeneration of multiple-use tree species in a semi-deciduous African tropical rainforest: Implications for primate conservation
Population structure and regeneration of multiple-use tree species in a semi-deciduous African tropical rainforest: Implications for primate conservation
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非洲半落叶热带雨林的种群结构和多用途树种的再生：对灵长类动物保护的影响
DOI：
10.1016/j.foreco.2009.03.019
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发表时间：
2009
影响因子：
3.7
通讯作者：
E. Witkowski
中科院分区：
文献类型：
--
作者：
E. N. Mwavu;E. Witkowski
保护艾伯丁裂谷生态区雨林中受威胁的食果灵长类动物（例如黑猩猩）和鸟类需要在了解食用树种的自然更新和种群趋势的情况下对其进行保护。然而，人们对许多森林中多种用途树种的种群结构和再生模式知之甚少。我们通过构建物种种群大小分类分布 (SCD) 并计算 SCD 斜率、幼苗：幼树和幼树：成年树的比率，研究了乌干达西北部布东戈森林保护区的 15 种树种（包括先锋树种、非先锋树种和遮荫树种）的种群结构和再生模式，这些树种既是木材又是灵长类食物来源。 SCD 斜率用作种群结构的指标，而斜率值则用于以单个数字总结一个物种的 SCD 形状。森林群落之间的物种组成差异显着，表明空间环境变化的影响。九个物种的幼苗密度和成虫密度之间存在显着的正相关。 9 个物种，即 Lasiodicus milbraedii、Celtis milbraedii、Pouteria altissima、Chrysophyllum albidum、Cynometra alexandri、Diospyros abyssinica、Funtumia elastica、Chrysophyllum perpulchrum 和 Antiaris foamaria 的 SCD 斜率呈高度负值，范围为 -2.47 至 -1.1，幼体与成体的比率为 5.34 至 5.34。 1.62。因此，清楚地表现出“逆 J”型曲线，并表明成功或健康的再生模式。相比之下，Alstonia boonei 和 Cordia millenii 的 SCD 斜率呈弱负值 -0.25，且幼年与成年的比率 <1；因此，再生模式为脉冲式或不连续式，且募集量低。 SCD 斜率和青少年与成人的比例因森林群落和历史管理实践 (HMP) 的不同而不同。大多数物种随着时间的推移成功且持续地招募，因此具有更稳定的种群结构。然而，对某些人来说，不连续的再生模式反映了不可持续的收获，这可能会消除子孙后代的种子来源。因此，布东戈森林保护区的管理需要加强和促进再生能力强和再生能力差的物种的计划/实践，以确保森林的可持续发展。保护砍伐地区的一些果树将有利于长期可持续的木材生产和野生动物保护，为食果动物提供食物以传播种子。
The conservation of threatened frugivorous primates (e.g. chimpanzees) and birds in the Albertine Rift Ecoregion rainforests requires the conservation of food tree species aided by an understanding of their natural regeneration and population trends. However, little is known of the population structure and regeneration patterns of a wide range of multiple-use tree species in many of these forests. We examined the population structures and regeneration patterns of 15 tree species (including pioneer, non-pioneer and shade-bearers) that are both timber and primate food sources in Budongo Forest Reserve, NW Uganda, by constructing species population size-class distributions (SCDs), and calculating SCD slopes, seedling:juvenile and juvenile:adult ratios. The SCD slopes were used as indicators of population structure, while the slope values were used to summarise, in a single number, the shape of the SCD for a species. Species composition between forest communities varied significantly, suggesting the influence of spatial environmental variations. Nine species had significant positive correlations between seedling and adult densities. Nine species, namely Lasiodiscus mildbraedii, Celtis mildbraedii, Pouteria altissima, Chrysophyllum albidum, Cynometra alexandri, Diospyros abyssinica, Funtumia elastica, Chrysophyllum perpulchrum and Antiaris toxicaria had highly negative SCD slopes spanning −2.47 to −1.1, and juvenile:adult ratios spanning from 5.34 to 1.62. Hence, clearly exhibiting ‘inverse J’ type curves, and suggesting a successful or healthy regeneration pattern. In contrast, both Alstonia boonei and Cordia millenii had weakly negative SCD slopes of −0.25, and juvenile:adult ratios <1; hence a pulsed or discontinuous regeneration pattern and low recruitment. The SCD slopes and juvenile:adult ratios varied between forest communities and historical management practices (HMPs). Most species recruit successfully and continuously over time, and hence have a more stable population structure. However, a discontinuous regeneration pattern for some, reflects unsustainable harvesting, that potentially eliminates seed sources for future generations. Hence, management of the Budongo Forest Reserve requires plans/practices that will enhance and facilitate the recruitment of both the vigorously and poorly regenerating species to ensure sustainable forest development. Preserving some fruiting trees in logged areas will benefit both long-term sustainable timber production and wildlife conservation, by providing food for frugivorous animals that will disperse the seeds.