摘要
选取上海崇明东滩"刈割+水位调节"集成技术治理互花米草示范工程样地,对互花米草二次入侵过程进行了2年的监测.结果表明:大量互花米草实生苗在春季随潮水沿潮沟等通道向恢复自然水文区扩散定居,2年即可形成与周边群落无明显差异的二次入侵群落,而群落边缘通过无性繁殖的扩散距离有限.在保持淹水控制区,互花米草两年累计扩散距离小于1m.在物理隔离区,2年未监测到互花米草的二次入侵现象.实生苗在春季的快速拓植是互花米草实现种群二次入侵的关键.彻底消除治理区周边互花米草扩散源,设置隔离带以阻止其向治理区的扩散,或采用种植芦苇等土著物种进行生物替代,是防止互花米草二次入侵的主要措施.
A demonstration plot in Chongming Dongtan for controlling exotic plant species Spartina alterniflora by using an integrated treatment technique of tussock cutting plus water level controlling was selected to make a 2-year monitoring on the reinvasion process of this plant species. A large number of S. alterniflora seedlings could proliferate and settle down in the hydrological restoring plots by tidal water in spring, and, after two years, the reinvasion community was established, with no obvious differences in its density as compared to the communities in neighboring areas. Howev- er, the distance of extension via vegetative propagation was limited. At the plots maintaining water- logging, the distance of 2-year lateral extension was less than 1 m; at physically isolated plots, there was no any reinvasion of S. alterniflora. The rapid spreading of the seedlings in spring was the key of the fast reinvasion of S. alterniflora, and thus, to completely eradicate the spreading source from neighboring areas, to build isolation barrier to stop the spreading of this plant, and to adopt bi- ological substitute by planting a native species such as Phragmites australis would be the main coun- termeasures to effectively prevent the reinvasion of S. alterniflora.
出处
《应用生态学报》
CAS
CSCD
北大核心
2012年第11期2997-3002,共6页
Chinese Journal of Applied Ecology
基金
云南省应用基础研究计划项目(2011FB069)
上海市科委海洋科技专项(10dz1211002)
云南省社会事业发展专项(2010CA010)资助
关键词
互花米草
二次入侵
有性扩散
无性繁殖
崇明东滩
Spartina alterniflora
reinvasion
sexual reproduction
vegetative propagation
Chong-ruing Dongtan.