Interactions between the range expansion of saltmarsh vegetation and hydrodynamic regimes in the Yangtze Estuary, China
Interactions between the range expansion of saltmarsh vegetation and hydrodynamic regimes in the Yangtze Estuary, China
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DOI：
10.1016/j.ecss.2011.11.027
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发表时间：
2012
影响因子：
2.8
通讯作者：
Zhenchang Zhu;Li-Quan Zhang;Ning Wang;C. Schwarz;T. Ysebaert
中科院分区：
文献类型：
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作者：
Zhenchang Zhu;Li-Quan Zhang;Ning Wang;C. Schwarz;T. Ysebaert
近15年来，外来物种互花米草（Spartina alterniflora）迅速入侵长江口崇明岛盐沼。发现两种类型的推进锋：S。互花米草-泥滩（S-M锋）和S.互花米草-海三棱藨草-泥滩（S-S-M前缘）。在这项研究中，在这两个前进的战线和吸积/侵蚀动力学作为一个代理可比的水动力制度的范围扩大的幼苗招聘和草丛发展进行了研究。结果表明：在不同的生长时期，S.在S-M锋面吸收的互花米草数量远高于在S-S-M锋面吸收的互花米草数量。在一个生长季后，S-M锋的活动范围扩展速度比S-S-M锋快得多。两种推进锋上的不同定殖行为与水动力机制的差异有关。在秋冬侵蚀、春夏增生的场地，原始的先锋种S. mariqueter被S. alterniflora和范围扩展的模式在S-M前发展。相反，在吸积机制相对稳定的地点，原始的先锋种S。马里奎特号留在前进的前线，并在S-S-M前线形成了射程扩大的模式。非生物和生物因素对S.互花米草及其对潮汐湿地空间结构的影响。
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 alterniflora has occurred. Two types of advancing fronts are found: the S. alterniflora–mudflat (S–M front) and the S. alterniflora –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. alterniflora 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. alterniflora 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. alterniflora and its implications on the spatial structure of tidal wetlands is discussed.