Long-Term Impacts of Selective Logging in a Tropical Rainforest in the East Region of Cameroon

IF 1.1 4区 环境科学与生态学 Q4 ECOLOGY African Journal of Ecology Pub Date : 2024-10-29 DOI:10.1111/aje.13341
S. E. Mokake, G. B. Chuyong, E. A. Egbe
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Abstract

Although selective logging has become the primary cause of degradation in many African countries, little is known about its long-term effects. This study investigated the long-term effects of selective logging on forest tree species diversity and dynamics in the East Region of Cameroon. Six permanent monitoring plots of 1 ha each in unlogged and logged forests were established in 2005 and a recensus in 2011. Each 1 ha plot was divided into 25, 20 × 20 m quadrats. Each 20 × 20 m quadrat was further divided into 16, 5 × 5 m subquadrats, where the diameter at breast height (DBH) of all trees ≥ 2 cm was measured. There was a decrease in plant species density and richness in all forest types. Sloetiopsis usambarensis was the most important species in the unlogged forests and forests logged 21 years ago. The most important family was Putrangivaceae, Euphorbiaceae and Violaceae in the unlogged forests and forests logged 11 and 21 years ago, respectively. The frequency distribution of stem size classes indicated a reversed J-shape of tropical forests. The above ground biomass (AGB) recovered more than 50% in all forests, and the unlogged forest had the highest AGB (961.8 Mg/ha). Larger stems indicated a forest at a stage of recovery from disturbance. Silvicultural management should be considered.

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喀麦隆东部地区热带雨林选择性采伐的长期影响
尽管选择性采伐已成为许多非洲国家森林退化的主要原因,但人们对其长期影响却知之甚少。本研究调查了选择性采伐对喀麦隆东部地区林木物种多样性和动态的长期影响。2005 年在未采伐森林和已采伐森林中建立了六个永久性监测地块,每个地块面积为 1 公顷,并于 2011 年进行了复查。每个 1 公顷的地块被划分为 25 个 20 × 20 米的四分小区。每个 20 × 20 米的四分小区又分为 16 个 5 × 5 米的小小区,测量所有胸径(DBH)≥ 2 厘米的树木。所有森林类型的植物物种密度和丰富度都有所下降。Sloetiopsis usambarensis 是未伐木森林和 21 年前伐木森林中最重要的物种。在未伐木森林和 11 年前和 21 年前伐木的森林中,最重要的科分别是莆兰科、大戟科和堇菜科。茎干大小等级的频率分布表明热带森林呈反向的 J 形。所有森林的地上生物量(AGB)都恢复了 50%以上,未伐木森林的地上生物量最高(961.8 兆克/公顷)。较大的茎干表明森林正处于从干扰中恢复的阶段。应考虑进行造林管理。
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来源期刊
African Journal of Ecology
African Journal of Ecology 环境科学-生态学
CiteScore
2.00
自引率
10.00%
发文量
134
审稿时长
18-36 weeks
期刊介绍: African Journal of Ecology (formerly East African Wildlife Journal) publishes original scientific research into the ecology and conservation of the animals and plants of Africa. It has a wide circulation both within and outside Africa and is the foremost research journal on the ecology of the continent. In addition to original articles, the Journal publishes comprehensive reviews on topical subjects and brief communications of preliminary results.
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