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首页> 外文期刊>IAWA Journal >Wood anatomy of Ceiba speciosa (A. St.-Hil.) Ravenna under urban pollution
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Wood anatomy of Ceiba speciosa (A. St.-Hil.) Ravenna under urban pollution

机译：Ceiba Speciosa（A. St.-Hil。）Ravenna在城市污染下的木材解剖学

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Urban pollution is one of the current environmental problems which most threatens the human and environmental health. In a fast-changing world, trees stand out among the sessile organisms that withstand the variations imposed by the environment throughout their lifespan. Thus, trees have become important objects of study in the evaluation of phenological, physiological and/or morphological plasticity. Previous studies have demonstrated the impact of urban environment on cambium anatomy and dendrochronology of Ceiba speciosa (Malvaceae), a native species of the Atlantic Forest. In the present study, our objective is to evaluate the impact of the urban environment on wood structure and consequently on the hydraulic architecture of Ceiba speciosa. Wood samples were collected by a nondestructive method, processed and analyzed according to the usual techniques for plant anatomy. Samples were collected in two sites: the first, an important forest remnant of the Atlantic Forest, and the second next to Avenida Brasil, the largest avenue in Rio de Janeiro, the fourth largest city in Latin America. Trees showed plasticity in seven anatomical features and significant differences in wood structure between both groups studied. Urban trees have lower hydraulic conductivity, shorter vessels and fibres, and larger, more frequent rays. These features demonstrate that in stressful situations, such as those observed in urbanized environments, Ceiba speciosa invests in more safety for water transport and in lower wood resistance, with a trade-off between high production of cells of low energy cost and providing storage of water and metabolic products for unfavorable periods.
机译：城市污染是当前威胁人类和环境健康的环境问题之一。在一个快速变化的世界中，树木脱颖而出，可以承受整个寿命环境所施加的变化。因此，树木已成为诸如酚类，生理和/或形态可塑性评估中的重要研究。以前的研究表明，城市环境对中产森林的天然物种的CEMIBA SCEMIOSA（MALVACEAE）对城市环境的影响。在本研究中，我们的目的是评估城市环境对木结构的影响，从而对Ceiba Speciosa的水力建筑。通过非破坏性方法收集木样品，根据植物解剖学的通常技术处理和分析。样品被收集在两个地点：第一个，大西洋森林的重要森林遗留，以及拉美德·贾尼罗最大的大道Avenida Brasil旁边，是拉丁美洲第四大城市。树木在研究的七个解剖学特征中显示了七种解剖学特征和显着差异，研究了两组的木结构。城市树木具有较低的液压导电性，较短的血管和纤维，更大，更频繁的光线。这些特征表明，在压力情况下，如在城市化环境中观察到的那些，Ceiba Speciosa投资于水运输和较低的木材抵抗力，在低能量成本的高生产细胞之间进行权衡，提供水和代谢产品不利的时期。

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