PDF(Pubmed)
Abstract：
Lindernia dubia (L.) Pennell is a species with invasive behavior outside of its native range of distribution (America), linked mainly to aquatic habitats. This annual species has been acknowledged as a weed in rice paddies in Europe and Asia. Due to the impacts of this invasive plant, some authors have even listed this species as a global invader. The present work focused on spontaneous plant species occurring in seedlings of Typha domingensis Pers. grown in central Spain for the establishment of constructed wetlands. Weed inventory revealed the presence of L. dubia as a dominant spontaneous species in this crop environment. A suite of mesocosm experiments were designed to study the population density of L. dubia versus that of the other dominant plant species, and to determine traits associated with its weedy potential. The results showed that L. dubia presents competitive attributes such as morphological variability, early flowering, long seeding time, short growth cycle, small and light seeds and a high seed production and germination rate (25 °C), meaning a high reproductive capacity in a cycle of about three months for plant growth in non-limiting conditions. The data obtained from this work provide a basis for understanding the weedy potential of L. dubia, and for management decisions of a potentially invasive species, which has been little investigated in Europe.
摘要：
乌兰草（L.）Pennell是一种具有入侵行为的物种，超出了其本地分布范围（美国），主要与水生栖息地有关。这种年度物种在欧洲和亚洲的稻田中被认为是杂草。由于这种入侵植物的影响，一些作者甚至将该物种列为全球入侵者。目前的工作重点是在樟树幼苗中发生的自发植物物种。生长在西班牙中部，用于建立人工湿地。杂草清单显示，在这种作物环境中，杜比氏菌是主要的自发物种。设计了一套中观实验来研究杜比氏菌与其他优势植物物种的种群密度，并确定与其杂草潜力相关的性状。结果表明，杜比氏菌具有竞争属性，如形态变异性，早期开花，播种时间长，生长周期短，小而轻的种子和高种子产量和发芽率（25°C），意味着在非限制性条件下植物生长在大约三个月的周期内具有高生殖能力。从这项工作中获得的数据为理解杜比氏菌的杂草潜力提供了基础，以及潜在入侵物种的管理决策，这在欧洲很少被调查。
