Selective Harvesting Impact on Natural Regeneration, Tree Species Richness and Diversity in Forest Co-management Block in Liwonde Forest Reserve, Malawi

Francis Kamangadazi, L. Mwabumba, Edward Missanjo, F. Phiri
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引用次数: 3

Abstract

Biodiversity conservation within forests depends, in part, on management practices that restore or maintain plant community diversity and function. Because many plant communities are adapted to natural disturbances, selective harvesting has potential to meet this need. This study was conducted to determine the impact of selective harvesting on tree species regeneration abundance, richness and diversity in Chidenga forest co-management block in Liwonde forest reserve, Malawi after four years of harvesting. The study constituted two treatments: harvested area (selective harvesting) and non-harvested area (control). The data obtained was analysed using Rẻnyi diversity profile in Biodiversity R. The results show that there were substantial variations between the treatments on the studied variables. Harvested area had higher tree species regenerants abundance (6088±452 ha -1 ) than non-harvested area (5324±364 ha -1 ). Harvested area had a higher Hα (2.64) at 0-alpha than Hα (2.48) for non-harvested area, indicating that harvested area had the higher tree species richness than non-harvested area in the understory. Furthermore, in the understory, harvested area had higher profile, 2.64 to 0.33 from 0-Alpha to infinity, than non- harvested area, 2.48 to 0.21 from 0-Alpha to infinity. This indicates that harvested area was more diverse than non-harvested area. In the overstory, harvested area had individual tree species evenly distributed than in non-harvested area. This signifies a healthy or good ecosystem. Therefore, it can be suggested that selective harvesting has a significant role in conservation of the forest resource base, and may be promoted for sustainable management of forest co-management blocks.
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马拉维Liwonde森林保护区森林共管区选择性采伐对自然更新、树种丰富度和多样性的影响
森林内生物多样性的保护部分取决于恢复或维持植物群落多样性和功能的管理做法。由于许多植物群落适应自然干扰,选择性采收有可能满足这一需求。本研究在马拉维Liwonde森林保护区Chidenga森林共管区块进行了4年的采伐,以确定选择性采伐对树种更新丰度、丰富度和多样性的影响。研究分为两种处理:采收区(选择性采收)和非采收区(对照)。利用生物多样性研究中心(biological R.)的Rẻnyi多样性剖面对数据进行分析。结果表明,不同处理间在研究变量上存在较大差异。采伐区树种再生物质丰度(6088±452 ha -1)高于非采伐区(5324±364 ha -1)。在0 α值处,采伐区的Hα值(2.64)高于非采伐区的Hα值(2.48),表明采伐区林下物种丰富度高于非采伐区。在林下,从0 α到无限远,采伐面积的轮廓值为2.64 ~ 0.33,高于未采伐面积的2.48 ~ 0.21。这表明收获面积比未收获面积更多样化。在林下,采伐区单株树种分布均匀,而非采伐区单株树种分布均匀。这意味着一个健康或良好的生态系统。因此,可以认为选择性采伐对森林资源基础的保护具有重要作用,并可能促进森林共同经营区块的可持续经营。
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