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首页> 外文期刊>Estuarine Coastal and Shelf Science >Interactions between the range expansion of saltmarsh vegetation and hydrodynamic regimes in the Yangtze Estuary, China
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Interactions between the range expansion of saltmarsh vegetation and hydrodynamic regimes in the Yangtze Estuary, China

机译：长江口盐沼植被范围扩展与水动力机制的相互作用

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Over the last 15 years, rapid invasion of large areas of the saltmarshes of Chongming Island, in the Yangtze Estuary, China by the exotic species Spartina altemiflora has occurred. Two types of advancing fronts are found: the S. altemiflora-mudflat (S-M front) and the S. altemiflora - Scirpus mariqueter -mudflat (S-S-M front). In this study, both the range expansion in terms of seedling recruitment and tussock development at these two advancing fronts and the accretion/erosion dynamics used as a proxy for comparable hydrodynamic regimes were investigated. The results showed that the mean number of seedlings of S. altemiflora recruited at the S-M front was much higher than that at the S-S-M front. The rate of range expansion after one growing season at the S-M front was much faster than the S-S-M front. The different colonisation behaviours on the two types of advancing front was related to the differences in hydrodynamic regimes. At the site with a regime of autumn/winter erosion and spring/ summer accretion, the original pioneer species of S. mariqueter was replaced by S. altemiflora and a pattern of range expansion at the S-M front developed. In contrast, at the site with a relatively stable accretion regime, the original pioneer species of S. mariqueter remained within the advancing front and a pattern of range expansion at the S-S-M front developed. The impact of abiotic and biotic factors governing the range expansion of S. altemiflora and its implications on the spatial structure of tidal wetlands is discussed.
机译：在过去的15年中，外来物种Spartina altemiflora迅速入侵了中国长江口崇明岛的大片盐沼。发现了两种类型的前进锋面：S。altemiflora-mudflat（S-M锋面）和S. altemiflora-Scirpus mariqueter -mudflat（S-S-M锋面）。在这项研究中，研究了在这两个发展前沿的范围，涉及幼苗募集和丛生发育的范围扩展，以及用作可比较水动力机制的替代物的吸积/侵蚀动力学。结果表明，在S-M锋面招募的半球形S.altemiflora的平均数量远高于在S-S-M锋面的。 S-M前沿一个生长季节后的射程扩展速度比S-S-M前沿快得多。在两种类型的前锋上，不同的定殖行为与水动力机制的差异有关。在有秋冬侵蚀和春夏增生的地区，S。mariqueter的原始先锋物种被S. altemiflora取代，并在S-M锋线上扩展了射程。相反，在具有相对稳定的增生机制的地点，S。mariqueter的原始先驱物种仍留在前进的锋面，并且在S-S-M锋线上出现了范围扩大的模式。讨论了控制生物多样性的非生物和生物因素的影响及其对潮汐湿地空间结构的影响。

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