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首页> 外文期刊>Restoration ecology >Improving success of rare plant seed reintroductions: a case study of Dalea carthagenensis var. floridana, a rare legume with dormant seeds
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Improving success of rare plant seed reintroductions: a case study of Dalea carthagenensis var. floridana, a rare legume with dormant seeds

机译：提高稀有植物种子引种的成功率：以大叶cart香为例。 floridana，一种罕见的豆类，具休眠种子

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摘要

Recent reviews of rare plant reintroduction success indicate that far fewer studies have been conducted with seeds than whole plants, and of these, less than 10% have established or had long-term population persistence reported. Because seed reintroductions are relatively less expensive than plant reintroductions, determining ways to increase efficacy of using seeds to establish rare populations has conservation benefits. In laboratory trials, we examined seed germination of an endangered legume, Dalea carthagenensis var. floridana, endemic in South Florida, U.S.A. Laboratory treatments confirmed that seeds are hard seeded, remaining viable for 1,452 days even when moist; nicking, heat, and freezing triggered higher and more rapid germination than controls. Field trials begun in 2009, using pretreated (frozen) and untreated seeds within two habitats (natural and novel) revealed that freezing pretreatment increased germination in both habitats. However, plants matured, reproduced, and established seedlings only in natural habitat, not in novel habitat. By 2012, seed treatment plots in natural pine rockland had significantly greater numbers of reproductive plants and seedlings than controls. In a restoration context, using seed pretreatments to stimulate germination can improve establishment success in suitable habitats. When paired with essential vegetation management and a controlled burn, seed augmentation helped rescue the population from the brink of extinction.
机译：最近对稀有植物成功引种的评论表明，用种子进行的研究少于完整植物，其中，只有不到10％的植物已经建立或有长期种群持久性的报道。由于重新引入种子要比植物重新引入便宜，因此确定增加使用种子建立稀有种群的功效的方法具有保护优势。在实验室试验中，我们检查了濒危豆科植物Dalea carthagenensis var的种子萌发。美国南部佛罗里达州特有的floridana实验室处理证实，种子是硬种子，即使潮湿也能存活1,452天;切口，热和冻结引发的发芽比对照更高，更快。 2009年开始的田间试验在两个生境中（自然和新颖）使用预处理（冷冻）种子和未处理种子，结果表明冷冻预处理可提高两个生境的发芽率。但是，植物仅在自然栖息地而不是在新的栖息地中才能成熟，繁殖并建立幼苗。到2012年，天然松树岩地的种子处理区的生殖植物和幼苗的数量明显多于对照。在恢复的情况下，使用种子预处理刺激发芽可以提高在适当栖息地的建立成功率。与必要的植被管理和可控的烧伤结合使用时，增加种子有助于使种群摆脱灭绝的边缘。

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