Abstract

Key message

Radial growth and wood anatomical variables of G. kola have a direct relationship with climate. Rainforest regions are more suitable and could be recommended for stakeholders for conservation action plans.

Abstract

Tropical agroforestry species are characterized by irregular growth and fruiting pattern, this is because of seasonal differences in the region and unanticipated environmental changes. Tree-ring width features and vessel variables could have a direct relationship with environmental conditions and factors such as precipitation and temperature could impact the growth of the species. This is because, during stressful environmental conditions, tree species record environmental changes through their physiological adjustment. Therefore, wood anatomical and tree-ring width time series was developed for Garcinia kola, a multipurpose tropical species, from a humid forest zone and derived savannah, along two vegetation zones in Nigeria. The species forms rings characterized by marginal parenchyma. The mean tree-ring width (TRW) ranges from 2.63 and 2.30 mm in the humid forest zone and derived savannah, respectively while the vessel number (VN) and vessel density (VD) are 95, 93, and 9.46, and 10.28 N/mm² respectively. The results revealed that the radial growth of G. kola showed a positive relationship with the precipitation and the minimum temperature during the peak of the rainy season in derived savannah areas. The VN, RW, and TVA show a significant relationship with the mean annual maximum temperature in the Rainforest and derived savannah area. The vessels are more abundant in samples from the rainforest area than in the derived savannah area, the results revealed that the wood anatomical variables and TRW were sensitive to climatic variables. Hence, they could be good indicators for evaluating tropical tree responses to environmental changes in tropical agroforestry species.

中文翻译：

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尼日利亚多用途农林树种（Garcinia kola.(Heckel)）的导管特征和年轮宽度及其与气候的关系

摘要

关键信息

G. kola的径向生长和木材解剖变量与气候有直接关系。雨林地区更适合，可以推荐给利益相关者制定保护行动计划。

抽象的

热带农林业物种的特点是生长和结果模式不规则，这是由于该地区的季节差异和不可预见的环境变化造成的。树木年轮宽度特征和血管变量可能与环境条件有直接关系，而降水和温度等因素可能会影响物种的生长。这是因为，在压力环境条件下，树种通过生理调节记录环境变化。因此，针对藤黄果（一种多用途热带物种）开发了木材解剖学和树轮宽度时间序列，该物种来自潮湿的森林区和衍生的稀树草原，沿着尼日利亚的两个植被区。该物种形成以边缘薄壁组织为特征的环。湿润森林区和衍生稀树草原的平均树轮宽度（TRW）范围分别为 2.63 和 2.30 毫米，而血管数量（VN）和血管密度（VD）分别为 95、93、9.46 和 10.28 N/分别为²毫米。结果表明，可乐树的径向生长与衍生草原地区雨季高峰期的降水量和最低气温呈正相关。VN、RW 和 TVA 与雨林和衍生稀树草原地区的年平均最高气温存在显着关系。来自雨林地区的样本中的船只比衍生的稀树草原地区的样本更丰富，结果表明木材解剖变量和 TRW 对气候变量敏感。因此，它们可能是评估热带树木对热带农林业物种环境变化反应的良好指标。