尼日利亚翁多州阿库尔森林保护区大构造木人工林(Taungya农场)土壤种子库-植被及更新潜力评价

B. Omomoh, V. Adekunle, P. D. Aigbe, F. O. Ademoh, B. M. Omomoh
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引用次数: 4

摘要

本研究调查了尼日利亚翁多州阿库尔森林保护区一个大构造种植园(Taungya农场)沿三个土壤深度的可发芽土壤种子库。采用系统样线法布置了3个50 × 50 m的样地。通过在每个样地取样15个不同的土壤样品(深度为0-3、3 - 6和6-9 cm)来评估人工林的组成,并通过3个月的温室发芽来确定种子库的组成。土壤种子库幼苗的shannon - wiener指数为2.8。其他生物多样性指标结果为;2.8为物种均匀度值。物种丰富度的Margaref指数为123.9。黄崖农场土壤种子库发芽幼苗的物种丰度为349种。在树龄密度方面,该人工林常见的树龄幼树为黑桫椤(Baphia nitida)、梧桐(Ficus恼怒)和榕叶(Rauvolfia vomitoria)。黄崖农场幼树的物种丰富度也很高,共有27株幼苗。Margalef物种丰富度指数为4.19,Pielou物种均匀度指数为0.9,Shannon Weiner指数为2.97。在整个研究过程中,种子库植物区系组成与上述植被(幼树)和人工林的相似度较低。结果表明,本研究中大多数物种的种子库密度和多样性受环境因子的影响较大。低土层丰富度较大,以草本物种为主,高土层(0 ~ 9 cm)丰富度减小,以草本物种为主。
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Evaluation of soil seed bank-vegetation and regeneration potential of Tectona grandis L. f. plantation (Taungya farm) in Akure forest reserve, Ondo State, Nigeria
The study investigated the germinable soil seed bank along three soil depths in a Tectona grandis plantation (Taungya farm) in Akure forest reserve, Ondo State, Nigeria. Three sampling plots of 50 by 50 m using systematic line transect were laid. Composition of the established plantation was assessed by taking fifteen different soil samples (0–3, 3–6 and 6–9 cm depth) at each plot and the seed banks composition was determined by greenhouse germination over a period of 3 months. In the soil seed bank seedling, the Shannon-Wienner index had 2.8. The result of other biodiversity indices were; 2.8 for species evenness value. For Margaref’s index of species richness, Taungya farm had value of 123.9. Species abundance in seedlings germinated from soil seed bank was observed as 349 species from Taungya farm. On the other hand, sapling densities, the common tree saplings in this plantation were Baphia nitida, Ficus exasperata and Rauvolfia vomitoria. The species abundance from the sapling was also observed in Taungya farm with the total of 27 seedling m.The value in the other biodiversity indices; Margalef’s index of species richness (4.19), Pielou’s species evenness index (0.9) and Shannon Weiner index (2.97). The similarity between the composition of the seed bank flora and that of the above vegetation (sapling) and established plantation was low throughout the study. The seed bank density and diversity for most species in this study were found to be greatly influenced by environmental factors. At low soil depth layer, richness is greater and herbaceous species dominate while at higher soil depth layer (0–9 cm) species richness diminishes and less dominates.
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