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首页> 外文期刊>Journal of geographical sciences >Sedimentation rates in the Wanggang salt marshes, Jiangsu
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Sedimentation rates in the Wanggang salt marshes, Jiangsu

机译：江苏望港盐沼的沉积率

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Coastal salt-marshes represent an important coastal wetland system. The total area of coastal wetlands exceeds 5000 km~2 in Jiangsu Province, China, but it is decreasing rapidly in response to the intense reclamation activities and coastal erosion along a part of the coastline. Hence, two types of plants, Spartina angelica and Spartina alterniflora, were introduced successively into the Jiangsu coastal areas, in order to protect the coastline from erosion and to increase the accumulation rate. Pb-210 and Cs-137 analyses were carried out for sediment samples from the salt-marshes of Wanggang to determine the sedimentation rate, on the basis of an evaluation of the background activity values and the factors affecting the enrichment of Pb-210. Analysis of a typical sediment column of the tidal flat shows that there is weak absorption of Pb-210 in the silt-dominated sediment. Because of the influences of factors such as storm events, bioturbation, material sources and analytical error, some abnormal data points appear in the Pb-210 record. After ignoring these data the calculated sedimentation rate was 3.3 cm yr~(-1) on average. Based upon analysis of the Cs-137 dating, the rate since 1963 was 3.1 cm yr~(-1) on average, similar to the data by Pb-210 dating and the previous studies. The dating results show that there were three stages of sedimentation, with the most rapid accretion being taking place after Spartina angelica was introduced into the area. The study also shows that at the stage of Spartina alterniflora growth, the accretion rate was higher than on the flat surface with the same elevation without the cover of this plant.
机译：沿海盐沼代表着重要的沿海湿地系统。中国江苏省沿海湿地的总面积超过5000 km〜2，但是由于强烈的开垦活动和沿海岸线的一部分的海岸侵蚀，该区域正在迅速减少。因此，为了保护海岸线不受侵蚀并提高积累率，先后向江苏沿海地区引入了当归植物和互花米草两种植物。在对背景活性值和影响Pb-210富集的因素进行评估的基础上，对望港盐沼的沉积物样品进行了Pb-210和Cs-137分析，以确定沉积速率。对潮滩典型沉积物柱的分析表明，淤泥为主的沉积物中对Pb-210的吸收较弱。由于风暴事件，生物扰动，材料来源和分析误差等因素的影响，Pb-210记录中出现了一些异常数据点。忽略这些数据后，计算出的沉降速率平均为3.3 cm yr〜（-1）。根据对Cs-137测年的分析，自1963年以来的平均速率为3.1 cm yr〜（-1），与Pb-210测年和先前研究的数据相似。测年结果表明，沉积过程分为三个阶段，当归草柏被引入该地区后，增生最快。研究还表明，在互花米草生长的阶段，在没有植物覆盖的情况下，在相同海拔高度的平坦表面上的吸积率要高。

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