Abstract Citronella gongonha is an abundant tree species in flood-prone areas of southern South America. In swamp forests, young and adult individuals of the species are mainly distributed on hummocks. In this study, we address some aspects of the ecology and physiology of C. gongonha that contribute to the knowledge of its distribution in swamp forests. We evaluated seed germination and growth parameters, as well as chlorophyll, malondialdehyde, hydrogen peroxide, nitrate and carbohydrate levels in young C. gongonha plants during different periods of flooding. Germination did not occur under flooding conditions, and seeds persisted only up to 30 days of flooding, losing germination potential as submersion time increased. However, young plants survived a long period of flooding (until 120 days) by reducing growth, developing morphological adaptations and using carbohydrate pools. These results help to explain the distribution pattern of C. gongonha in swamp forests, predominantly on hummocks where soil flooding is attenuated.

中文翻译：

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洪水持续时间不同地影响来自新热带南部的沼泽树 Citronella gongonha 的种子萌发、生长和生态生理学

摘要 Citronella gongonha 是南美洲南部洪水易发地区的丰富树种。在沼泽森林中，该物种的年轻和成年个体主要分布在小丘上。在这项研究中，我们讨论了 C. gongonha 的生态学和生理学的某些方面，这些方面有助于了解其在沼泽森林中的分布。我们评估了不同洪水时期幼苗 C. gongonha 植物的种子发芽和生长参数，以及叶绿素、丙二醛、过氧化氢、硝酸盐和碳水化合物水平。在淹水条件下不会发芽，种子只能在淹水后持续 30 天，随着淹水时间的增加而失去发芽潜力。然而，幼苗通过减少生长而在长时间的洪水中存活下来（直到 120 天），发展形态适应和使用碳水化合物库。这些结果有助于解释 C. gongonha 在沼泽森林中的分布模式，主要是在土壤洪水减弱的小丘上。