Trapping Effect of Tidal Marsh Vegetation on Suspended Sediment, Yangtze Delta
Trapping Effect of Tidal Marsh Vegetation on Suspended Sediment, Yangtze Delta
复制标题
DOI：
10.2112/08-1010.1
复制
发表时间：
2009-07
期刊：
影响因子：
--
通讯作者：
H. Li;S. L. Yang
中科院分区：
文献类型：
--
作者：
H. Li;S. L. Yang
摘要为定量研究潮沼植被对悬浮泥沙的截留作用，在长江三角洲不同生境中，对3种潮沼植物的附着泥沙量进行了测定。我们还测量了悬浮泥沙浓度（SSC）和床水平的潮汐沼泽研究其对附着的沉积物植被和当地的总沉积速率的贡献的影响。结果表明：（1）叶片、茎节和果实上的沉积物密度比茎、叶上高5 ~ 10倍;（2）叶片、茎节和果实上的沉积物量比茎、叶上的沉积物量高10 ~ 15倍;（3）叶片、茎节和果实上的沉积物量比茎节和果实上的沉积物量高10 ~ 15倍;（4）果实上的沉积物量比茎节和果实上的沉积物量高10 ~ 15倍;（5）果实上的沉积物量比茎节和果实上的沉积物量高10 ~ 15倍;（6）果实上的沉积物量比茎节和果实上的沉积物量高10倍;（7）果实上的沉积物量比茎节和果实上的沉积物量高10倍。（干重18至559克/平方米）被植被捕获，随着植物生物量的增加而增加（3）植物附着沉积物干重从10-15 g/m ~ 2急剧下降到互花米草沼泽的10%和海三棱藨草沼泽的<10%。结果表明，潮滩植被截留泥沙量与植物特性、悬浮泥沙含量和决定潮滩淹没度的床面高度有关;互花米草比本地的藨草和芦苇植物更有效地捕获悬浮沉积物。
Abstract To quantify the trapping effect of tidal marsh vegetation on suspended sediment, we measured the amount of sediment adhering to three species of plants in different habitats in the Yangtze Delta. We also measured suspended sediment concentrations (SSC) and bed levels in the tidal marsh to examine their influence on the adherence of sediment to vegetation and the contribution of vegetation-trapped sediment to the local total deposition rate. The results include (1) the density of sediment trapped in the joints of leaves and stems and on fruits, which was 5 to 10 times higher than that on the stems and leaves; (2) the amount of sediment (18 to 559 g/m2 in dry weight) trapped by vegetation, which increased with plant biomass (220 to 5408 g/m2 in dry weight); (3) the dry weight of sediment adhering to plants, which drastically decreased from 10–15 g/m2 to 10% of the total depositional rate in the Spartina alterniflora marsh and <10% of the total depositional rate in the Scirpus mariqueter marsh. It was concluded that the amount of sediment trapped by the tidal marsh vegetation was related to plant properties, to the SSC, and to the bed level, which determines the tidal submergence; the introduced S. alterniflora is significantly more efficient in trapping suspended sediment than the native Scirpus and Phragmites plant species.