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首页> 外文期刊>Estuarine Coastal and Shelf Science >Hurricane sedimentation in a subtropical salt marsh-mangrove community is unaffected by vegetation type
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Hurricane sedimentation in a subtropical salt marsh-mangrove community is unaffected by vegetation type

机译：亚热带盐沼沼泽群落中的飓风沉降不受植被类型的影响

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摘要

Hurricanes periodically deliver sediment to coastal wetlands, such as those in the Mississippi River Delta Complex (MRDC), slowing elevation loss and improving resilience to sea-level rise. However, the amount of hurricane sediment deposited and retained in a wetland may vary depending on the dominant vegetation. In the subtropical climate of the MRDC, the black mangrove (Avicennia germinans) has been expanding and replacing salt marsh (Spartina alterniflora). Because these vegetation types differ in structure, their influence on sedimentation may also differ. We conducted a survey along 160 km of coastline to determine if the spatial deposition pattern in saline wetlands by Hurricanes Gustav and Ike in September 2008 was differentially influenced by vegetation type. Sampling was initiated two months after landfall at eighteen sites in the MRDC containing side-by-side stands of A. germinans and S. alterniflora along the shoreline, with S. alternifiora marsh landward. Average thickness of hurricane sediment across sites varied from 0.6 to 5.6 cm with an overall mean of 2.6 +/- 0.4 cm. Within sites, hurricane-layer thickness varied from 1.3 cm at the shoreline to 4.8 cm in the marsh interior, but this pattern was unaffected by vegetation type. Despite greater canopy height, stem density (including pneumatophores), and leaf area, mangroves did not capture more hurricane sediment than salt marsh nor did they attenuate the delivery of sediment to the marsh interior. Data recorded at thirty-six monitoring stations in Louisiana's Coastwide Reference Monitoring System further showed that rates of accretion, as well as elevation change, in saline wetlands (S. alterniflora) of the MRDC were temporarily increased by Hurricanes Gustav and Ike. These findings agree with previous work showing the beneficial effects of hurricane sediments on coastal wetlands, but suggest that a climate-driven shift from S. alternifiora to A. germinans in the MRDC will not necessarily alter hurricane sediment capture.
机译：飓风定期为沿海湿地提供沉积物，例如密西西比河三角洲复合体（MRDC）的沉积物，放缓高度损失，提高海平面升高的弹性。然而，沉积和保留在湿地的飓风沉积物的量可能因主要植被而有所不同。在MRDC的亚热带气候中，黑色红树林（Avicennia Germinans）一直在扩大和更换盐沼（Spartina alterniflora）。由于这些植被类型的结构不同，因此它们对沉降的影响也可能不同。我们沿着160公里的海岸线进行了一项调查，以确定盐水湿地的空间沉积图案是否由飓风·古斯塔夫和艾克于2008年9月的植被类型对其进行差异影响。在MRDC中的十八位点乘坐沿着海岸线的A. Germinans和S. allefiNlora的一侧站在MRDC中的十八位点开始了两个月。飓风沉积物的平均厚度从0.6到5.6厘米不同，整体平均值为2.6 +/- 0.4厘米。在地点内，飓风层厚度在沼泽内部的海岸线上的1.3厘米变化至4.8厘米，但这种模式不受植被类型的影响。尽管冠层高度，茎密度（包括肺炎）和叶面积，红树林没有比盐沼捕获更多的飓风沉积，也没有衰减泥沙内部的沉积物。在路易斯安那州的海岸线上参考监测系统的三十六个监测站中记录的数据进一步表明，MRDC的盐水湿地（S.）在MRDC的盐水湿地（S.）的升高变化率暂时增加。这些调查结果同意以前的工作表明飓风沉积物对沿海湿地的有益效果，但表明，来自S.偏航机的气候驱动的偏移到MRDC中的A. Germinans将不一定改变飓风沉积物捕获。

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