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Review. Reproductive ecology of riparian elms

机译：评论。河岸榆树的生殖生态学

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This paper review our current knowledge of the reproductive ecology in the genus Ulmus, for which few investigations has been conducted and relatively little information is available. In the genus Ulmus, as in other riparian or sub-riparian genera, trees reproduce either vegetatively (by sprouting) or sexually. These mechanisms work differently. Sprouting permits colonization of open areas close to the trees, being especially frequent from large trees following death of their stem. Sprouting from the surviving roots of trees affected with Dutch Elm Disease is abundant in Spanish Ulmus minor. Sexual reproduction is infrequent, and requires some special conditions to be successful. It probably occurs coincidently with massive river floods that remove riparian vegetation and deposit a fertile muddy bed suitable for seed germination. Many Ulmus minor genotypes do not produce seed owing to seed abortion and other mechanisms. As a result, two gender-classes, male and cosexual, are presumably present in Spain, although this requires confirmation. A hypothesis trying to explain female sterility as the result of a trade-off between sexual and vegetative reproduction has been recently proposed, but it requires to be confirmed. Further research is also necessary for a better knowledge of flooding effect on elm regeneration and for evaluating other aspects of its reproductive ecology.
机译：本文回顾了我们对榆树属生殖生态学的当前知识，对此我们进行了很少的研究，并且可获得的信息相对较少。与其他河岸或近岸河岸属一样，在榆树属中，树木通过营养（有芽）或有性繁殖。这些机制的工作方式不同。发芽允许在靠近树木的空地定居，特别是在大树枯死后，这种情况尤其常见。在西班牙榆树未成年人中，从幸存的受到荷兰榆树病侵害的树木的根中发芽。有性生殖很少见，需要一些特殊条件才能成功。它可能与大量河流洪水同时发生，这些洪水清除了河岸植被并沉积了适于种子发芽的肥沃泥泞床。由于种子流产和其他机制，许多榆属次要基因型不产生种子。结果，西班牙大概有两种性别等级，分别是男性和男性。最近有人提出了一种假设，试图解释由于有性生殖和无性生殖之间的权衡而导致的女性不育，但这一假设需要得到证实。为了更好地了解洪水对榆树再生的影响并评估其生殖生态学的其他方面，也需要进一步的研究。

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