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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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江苏王港盐沼的现代沉积速率
DOI: 10.11821/xb200501007, PP. 61-70
Keywords: 盐沼湿地,沉积速率,210Pb和137Cs测年,米草,江苏海岸
Abstract:
江苏海岸湿地总面积超过5000km2,但围垦活动的加剧使盐沼湿地面积迅速减少;为了达到海岸防护、保滩促淤的目的,先后引种了大米草和互花米草。通过采集江苏王港潮滩盐沼湿地9处柱状样和挖取探槽剖面,以及对沉积剖面样品进行210Pb和137Cs测年分析,探讨了210Pb的本底及影响210Pb富集的因素,估算了王港盐沼湿地的现代沉积速率。王港潮滩盐沼沉积物对210Pb的吸附作用较弱;受风暴潮、生物扰动、物源变化及实验误差等因素的影响,在210Pbex剖面上出现了数据异常点,将这些数据点剔除后计算得到的沉积速率为3.3cmyr-1。137Cs测年显示,该地区1963年以来的平均沉积速率3.1cmyr-1,与210Pb法及前人研究结果相一致。根据一个典型剖面的137Cs测年数据分析,王港潮滩盐沼的沉积过程根据地貌特征的不同可分3个阶段,大米草覆盖阶段滩面高程迅速增加,互花米草的生长提高了滩面淤积速率。
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