Does invasion of Spartina alterniflora alter microhabitats and benthic communities of salt marshes in Yangtze River estuary
Does invasion of Spartina alterniflora alter microhabitats and benthic communities of salt marshes in Yangtze River estuary
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DOI：
10.1016/j.ecoleng.2015.12.026
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发表时间：
2016-03
影响因子：
3.8
通讯作者：
W. Quan;Heng Zhang;Wu Zuli;Shaofei Jin;F. Tang;Jianbo Dong
中科院分区：
文献类型：
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作者：
W. Quan;Heng Zhang;Wu Zuli;Shaofei Jin;F. Tang;Jianbo Dong
互花米草在长江口盐碱地迅速蔓延。然而，关于OFS的影响并没有一致的模式。互作植物入侵对微生境和底栖生物群落的影响。这项研究首先比较了不同入侵物种之间的植被、水流速度、沉积物沉积速率、沉积物特性和底栖生物群落。在东滩、九段沙和南汇3个样点(东滩、九段沙和南汇)，采用两两抽样设计，进行了四季交替分布斑块的研究。这些摊位是OFS的。互作比DIDS表现出更高更低的枝条密度，更高的地上生物量和更长的物候期。互花米草具有显著较低的水流速度、较大的泥沙沉积速率和较高的光衰减。马里克斯的栖息地。总体而言，入侵和未入侵生境的沉积物温度、盐度、孔隙度、有机碳含量和微藻生物量(CHLA)在3个地点中的任何一个都没有显著差异。在所记录的37种大型动物中，34种在不同生境类型之间没有密度差异。对大型动物的影响有限，仅在东滩有明显的影响。在秋季，交链藻类的腹足类密度明显较高。在12个观测中的8个中，入侵和未入侵生境之间的底栖群落结构没有差异。结果表明，物理结构上的差异不足以显著改变沉积物性质、大型动物密度和群落结构。
Smooth cordgrassSpartinaalterniflorahas rapidly spread in salt marshes of Yangtze River estuary. However, there is no consistent pattern on the effects ofS. alterniflorainvasions on microhabitats and benthic communities. The study first compared vegetation, water velocity, sediment deposition rate, sediment properties and benthic communities between invasiveS. alternifloraand nativeScirpusmariqueterpatches using a pair-wise sampling design at 3 sites (Dongtan, Jiuduansha and Nanhui) in four seasons. The stands ofS. alternifloraexhibited taller and less dense shoots, greater aboveground biomass and longer phenological phase than didS. mariqueter.S. alternifloramarshes had significantly lower water velocity, greater sediment deposition rates and higher light attenuation relative toS. mariqueterhabitats. In general, sediment temperature, salinity, porosity, organic carbon content and microalgal biomass (Chla) did not significantly differ between invaded and uninvaded habitats at any of 3 sites. Thirty-four of 37 macrofauna species recorded did not exhibit density differences between habitat types. Limited influences on macrofauna were evident only at Dongtan whereS. alternifloramarshes had significantly greater gastropod densities in the autumn. In 8 of 12 observations, benthic community structure did not differ between invaded and uninvaded habitats. It was concluded that the differences in physical structure were not enough to significantly change sediment properties, macrofaunal density and community structure.