国际林业研究杂志

约旦河西岸和热带农业国际研究所（IITA）的块森林的多样性和相似性指数的比较分析采用样带和情节采样技术的植被进行的调查。六个断面{一种（270°W），乙（90°E），C（180°S），d，Ë（0°N），和F（180°W）}用棱柱罗盘的西部银行森林和块A森林借助于构成。10 sampling plots of 10 m × 10 m were demarcated along each transect making 30 plots in each forest, and a total number of 60 plots were used for the study. Complete enumeration and identification of plants were carried out in each plot. The results showed that block A forest had 167 plant species from 58 families while west bank forest had 146 plant species from 56 families. A total number of 219 plant species from 70 families and 5804 individual plants were recorded in the two forests. West bank forest had higher values of all the diversity indices and Gamma diversity except Margalef’s community diversity index and alpha diversity index which were high in block A forest. Sorensen’s and Jaccard similarity indices of plants between west bank forest and block A forest were 59.42% and 42.66%, while the dissimilarity index of 40.58% was recorded. Thus, the two forests are richer and diverse in plant species; adequate protection of the two forests should be a priority to prevent loss of diversity of plants. Cutting of poles from the forests should be stopped.

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米欧埔地区林地是涵盖坦桑尼亚大陆的林地约93％，主要植被类型。它形成于坦桑尼亚的乡村景观的重要组成部分，并提供广泛的产品和服务，包括碳汇起着至关重要的作用。然而，森林资源的可持续性利用其利用率的大小主要影响。应该有森林生长和清除之间的平衡。然而，去除量和碳在全国的幅度是不知道。量，生物量和碳储量清除的量化是开发有效减缓气候变化的战略，决策，以及促进可持续森林管理至关重要。乙ased on the National Forest Resources Monitoring and Assessment data (NAFORMA) comprising 7,026 stumps collected from 16,803 circular plots of 10 m and 15 m radii established in Miombo woodlands of Mainland Tanzania, volume and carbon stock removals were estimated with the use of models that utilize stump diameter (SD) as the sole predictor. Results indicate that the annual volumes, aboveground biomass removed, and belowground biomass removed were 1.71 ± 0.54 m³哈^-1年^-1，1.23 ± 0.37 t ha^-1年^-1， 0.43±0.12 t ha^-1年^-1,分别。此外，去除地上和地下相应的碳为0.6±0.18 tC ha^-1年^-1tC ha为0.21±0.05^-1年^-1分别。因为估计的年体积去除量超过了1.6±0.2 m的估计年平均增量³哈^-1年^-1在米欧埔地区林地的采伐表示不可持续性，将最终进入森林退化。研究结果还显示，在清除以下门类较为突出：刀耕火种，生产林，牧场，一般土地，农村土地，东部和南部地区。这增加适当的管理战略文件呼吁，以确保这些土地类别和坦桑尼亚大陆的整个米欧埔地区林地的可持续发展。

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紫檀属菌Poir。（豆科），也被称为Vène或西非紫檀木，是萨赫勒 - Sudanian和苏丹 - 几内亚热带稀树草原和西部非洲的森林的多功能特有树种。在多哥，物种过度开发，其危险阻碍其生存。恢复下降看台上，使用的种子，或者繁殖材料的需要，紧急建议其形态变化的评估。这项研究的目的是确定的鉴别形态的描述，让我们来描述，也表征物种。分布在多哥整个地理分布区种源叶（7个描述符），水果（4个描述符），和种子（4个描述符）的性状进行评价。波动（CV）和主成分分析（PCA）的系数被用来评估树群中的变异性。结果表明，对于鉴别形态描述p . erinaceus在多哥，叶子和终端小叶的宽度，水果的长度和宽度，以及种子的长度和重量。这六个主要的相关变量使我们能够区分三组形态p . erinaceus人口。

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这项研究调查了用于边沿内部梯度的殖民重要的环境因素和树种的特性，用于后来的应用由高地农业落叶林在美坤眉所创建的边缘过渡区的恢复流域，泰国西北部。Three belt plots (100 × 10 m) were established at the transition from the forest edge to the interior of two deciduous forest types (mixed deciduous forest [MDF] and deciduous dipterocarp forest [DDF]), for a total of six belt plots. The species composition of canopy trees and regenerated seedlings and saplings was assessed, together with several environmental factors. We analyzed the relative importance of the physical environment and recruitment limitation was evaluated in relation to the regeneration traits of tree species. The results indicated that it was difficult for DDF and MDF species to effectively colonize the near-edge areas of the forests, primarily because the key factors related to seedling and sapling colonization (i.e., recruitment limitation, the physical environment, and factors related to forest structure) did not match the edge environment. Generalist species experienced much less recruitment limitation along the edge-interior gradients of both DDFs and MDFs. Generalists such asPterocarpus macrocarpus，黄檀cultrata,荆条羽叶在两个落叶林的边缘展出条件下取得更大的成功建立。这些结果表明，全科物种的自然再生可以用作在森林边缘恢复的第一步骤，由于其由初级森林物种殖以后便利。

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本研究比较了2号和3号单枝序遮荫对野生阿特拉斯雪松近端5类短枝存活、生长和繁殖的影响(北非雪松(Endl)。G. Manetti ex Carriere)。光照对两个分枝的短枝数没有影响，而光照对两个分枝的短枝伸长只有促进作用。与日光相比，荫凉暴露对针损的影响取决于分枝的顺序;它弱到(2)阶，增加到更高阶。在枝序3中，不分枝的短枝SSnr和短枝SS/T的叶片数量明显减少，而在枝序2中，只有短枝SS (nr + r)的叶片数量明显减少。在短枝伸长和针损方面，3号枝的SS/T与2号枝的SS (nr + r)表现相同。与光照相比，阴影只显著降低了2号枝序花粉的产量。近端短枝伸长、叶片寿命与腋生产物花粉的产生关系密切C.王者皇冠被发现。

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这项研究是在埃塞俄比亚的沙舍门地区进行的。通过非正式和正式调查收集了与管理有关的数据。收集了60个家系的树种多样性及其相关参数。测量并记录胸径≥5cm (DBH)的木本种，在10m内统计并记录5cm以下的木本种10米和1米 1 m plot, respectively. A total of 36 woody species were recorded, of which 58% were indigenous to the area. The overall mean number of woody species per plot was 3.13. Four woody species, namely,科迪亚AFRICANA，巴豆macrostachyus，鳄梨美洲,阿拉伯茶，表现最为重要的价值指数。农民对选定的木本植物偏好行列中记录的顺序科迪亚AFRICANA，桉树camaldulensis，巴豆macrostachyus,柏木lusitanica,分别。在研究村庄之间木本物种组合物中的相似性的范围为0.46〜0.60。为了维持木本物种的管理，实现农民剪枝，间伐，堆肥，除草，挖掘，并在该地区的活动浇水。花园及市场和道路的无障碍是homegarden农林业木本物种的主要决定因素。该研究显示木本物种多样性，实现管理规范，并影响homegarden农林业木本物种多样性管理因素。因此，政府应该在基础设施，资源重新分配，并提高人们的意识在社区工作了更好的改善物种多样性和homegarden农林业的可持续管理。

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