米草属植物在中国海岸带的分布现状
Distribution of Spartina plantations along the China’s coast
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摘要: 结合遥感调查、现场定位,辅以文献检索、函调、电子邮件、电话等调查方式分析了4种米草属植物自引种以来在我国海岸带分布的历史及现状,结果表明,因人类围垦活动、大米草(Spartina anglica)的自身退化以及与互花米草存在生态位竞争关系,大米草在全国海岸带的分布面积不足16hm2,呈退化趋势。大绳草(Spartina cynosuriodes)尚未在实验地种植,狐米草(Spartina patens)仅在苏北、天津市的部分区域有少量种植。这两种米草没有对本土生态系统造成入侵威胁。互花米草(Spartina alterniflora)自1979年引种以来在全国海岸带被广泛种植,后经自然扩散,目前面积已达34451 hm2。结合我国的海岸带特征与互花米草的生态位,可以把其生长区域明显分为三部分:一是福建省福鼎市以南的海岸带滩涂,可能与红树林潜在的生态位竞争有关系;二是河口区域,如在长江口的崇明东滩,互花米草与本土植物表现出明显的竞争关系;三是在其他滩涂区域,该物种可能对本土生态系统造成一定程度的影响,在某些区域可能已经表现出一定的入侵性,但是其带来的促淤造陆、保滩护岸等巨大的生态效益也不应忽视。由于我国海岸带地质地貌类型复杂,互花米草在不同区域表现出不同的定植和扩散能力,与本土植被的竞争关系也明显不同。因此,在评价互花米草所造成的生态后果时,应从不同的角度出发进行全面、系统、客观、公正地评价。Abstract: Four Spartina plantations,S.anglica,S.alterniflora,S.patens and S.cynosuriodes,have been introduced to China since 1963.S.anglica and S.alterniflora have been widely planted along the China's coast and arousing hot discussions and arguments about their effects and characteristics of invasion since 2000.The survey shows that S.anglica has been greatly degraded and only 16 hm2 are left along the China's coast.However,S.alterniflora has widely spread to Liaoning Province,Hebei Province,Tianjin Municipality,Shandong Province,Jiangsu Province,Shanghai Municipality,Zhejiang Province,Fujian Province,Guangdong Province,the Zhuangzu.Autonomous Region of Guangxi and HongKong with an area of 34 451 hm2 till 2007.The distribution of S.alterniflora<、i> can be divided into three parts according to its ecological niche and the characteristics of the China's coast.One is the tidal flats to the south part of Fuding,Fujian Province,which shows potential competition with mangrove ecosystem.The other is estuaries,especially in the Changjiang Estuary,which shows obvious competition with native reeds and Scirpusmari queter.The third is coastal tidal flats in the China's coast,which shows ambiguous effects among its economic,environmental,ecological benefits and invasive threats against local ecosyst em.S.alterniflora has shown different colonization capacity and spreading capacity in different areas in China's coast according to its distribution.Therefore,further studies and assessments on the ecological effects caused by S.alterniflora in the China's coast should be scientifically evaluated.
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Key words:
- Spartina plantations /
- S.alterniflora /
- distribution /
- ecological factors /
- China’s coast
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