摘要
河口湿地的特殊环境使其容易成为入侵植物的桥头堡。近年来我们在鸭绿江口湿地发现了一种原产北美,为东亚地区首次记录的慈姑属水生植物Sagittaria graminea,依其种加词的含义,我们将其中文名定为"禾叶慈姑"。调查表明,该外来种已有4个主要居群分布在鸭绿江河口湿地近30 Km的江岸边,最大的一个居群其斑块覆盖的总面积已超过2 000 m2且具有强烈的排它性,显示出典型的入侵种特点。研究表明,对一定水位或潮汐性淹没的要求是该种生长在岸边低位湿地的主要原因,水体的盐度会限制其向近海河口湿地的分布。分析了该种可能的入侵途径及生态风险。
Estuary wetland has been considered as the bridgehead for invasive species due to its special environment.Sagittaria graminea,an aquatic plant which is native to North American,was found in our recent field investigation in Yalu River estuary wetland.It is recorded in East Asia for the first time.The results of our field survey indicated that there were four populations of Sagittaria graminea distributed in Yalu River Estuary wetland with a range of about 30 km along the river.The largest population covers about 2 000 m2 in this area and shows a great exclusiveness.The effects of tide on the distribution patterns of the invasive species Sagittaria graminea in Yalu River Estuary wetland were studied.The results indicated that reasons for the species planting in low marsh is the demand for a water level to some degree or submersion caused by tide of the species.It was also found that the distribution of this species was also affected by salinity of the water body.Besides,the possible invasive routes and ecological risks were also discussed.
出处
《辽东学院学报（自然科学版）》
CAS
2011年第1期39-44,共6页
Journal of Eastern Liaoning University:Natural Science Edition
基金
国家自然科学基金项目(30970554)
辽宁省教育厅科研计划项目(2009A267)
关键词
入侵植物
河口湿地
鸭绿江口
禾叶慈姑
分布模式
invasive plant
estuary wetland
Yalu River Estuary
Sagittaria graminea
distribution pattern
