卡卡梅加(Kakamega)森林边缘密度与分离片区树种丰富度之间的关系。

Emma Anyango, B. Oindo, Joan Namasaka, Catherine Nyongesa, Grace Onoka
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摘要

目的:指导本研究的理论方法是岛屿生物地理学理论。本研究的目的是评估森林片断的边缘密度对树种丰富度的影响。研究方法:本研究采用横断面相关研究设计。采用比例随机抽样法。马拉瓦依次进行实地取样和测量。数据收集工具包括测量带、米尺、GPS 64s Garmain 和 suunto 倾角计。在三个片区共记录到 39 种树木,其中非洲杉(Funtumia africana)是最多的树种。研究结果研究结果表明,马拉瓦的树种丰富度分别为 83%、85% 和 92%。马拉瓦(r2 = 0.83)、基塞雷(r2 = 0.85)和伊库瓦(r2 = 0.92)的树种丰富度依次可以用片段的边缘密度来解释。边缘密度还依次解释了马拉瓦(r2 = 0.87)、基塞雷(r2 = 0.94)和伊奎瓦(r2 = 0.94)树种相对丰度变化的 87%、94% 和 94%。对理论、政策和实践的独特贡献:结论是,卡卡梅加森林独立部分的树种丰富度和树种丰度主要受森林片段总边缘长度和片段边缘密度的影响。为了保护更多的树种,我们建议将边缘密度(3.413.79m/m2)保持在15千米以上,以保持较高的树种丰富度和树种相对丰度。
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The Relationship between the Edge Density of the Forest Fragments and the Tree Species Richness in the Detached Fragments of Kakamega Forest.
Purpose: The theoretical approach guiding this study was based on the Island Biogeography Theory. The purpose of this study was to assess the influence of the edge density of the forest fragments on tree species richness. Methodology: The study adopted a cross-sectional correlational research design. Proportionate random sampling was used. A sample of 30 plots each measuring 2m by 2m was established randomly in the fragments (0-200m from the edge towards the interior);Malava: Kisere: Ikuywa in that order for field sampling and measurements. Data was collected using tools such as measuring tapes,metre rule,GPS 64s Garmain and suunto inclinometer. A total of 39 species of trees were recorded from the three fragments with Funtumia africana being recorded as the most abundant species. Findings: The findings show 83%, 85%, and 92% variation of tree species richness in. Malava (r2 = 0.83), Kisere (r2 = 0.85) and Ikuywa (r2 = 0.92) in that order can be explained by the edge density of the fragments. The edge density also explained 87%, 94% and 94% variation of tree species relative abundance in Malava (r2 = 0.87), Kisere (r2 = 0.94) and Ikuywa (r2 = 0.94) in that order. Unique Contributor to Theory, Policy and Practice: It was concluded that tree species richness and tree species abundance in the detached portions of Kakamega forest were dominantly influenced by forest fragment total edge length and fragment edge density. For us to conserve more tree species we recommend maintenance of the total edge length of the fragments above 15km with edge density (3.413.79m\m2) in order to maintain high tree species richness and tree species relative abundance.
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