渤海湾西岸潮间带现代沉积速率研究  

Modern sedimentation rates in the intertidal zone on the west coastal zone of the Bohai Gulf

作　　者：孟伟[1] 雷坤[2] 郑丙辉[2] 王福[3] 王宏[3] 李建芬[3] 李勇[4] 

机构地区：[1]中国海洋大学海洋环境学院,山东青岛266003 [2]中国环境科学研究院,北京100012 [3]中国地质调查局天津地质矿产研究所环境与水资源室,天津300170 [4]中国农业科学院农业环境与可持续发展研究所,北京100081

出　　处：《海洋学报》2005年第3期67-72,共6页

基　　金：国家高技术研究发展计划("863"计划)课题"渤海典型海岸带生境修复技术"资助项目(2002AA648010).

摘　　要：利用渤海湾西岸潮间带柱状沉积物的210Pbex和137Cs活度测定结果,计算了潮间带现代沉积物的平均沉积速率,结果表明,渤海湾西岸潮间带砂质区(道沟子至独流减河)1955～1963年的沉积速率为3.43～4.06cm/a,1963年以来的平均沉积速率为0.65～1.59cm/a;泥质区(歧口附近)的平均沉积速率约为1.81cm/a.上述结果说明潮间带砂质区在20世纪50～60年代发生快速沉积作用,60年代之后沉积作用变缓.这可能是由于华北地区在该时段具有丰沛的降水和入海水沙,为潮间带沉积物提供了丰富的物源.60年代以后沉积作用变缓可能是自然和人类活动引起的入海水量减少和由此导致的物源减少的结果.On the basis of the measurement of ^(210)Pb_(ex) and ^(137)Cs activities in the sediment cores taken from the intertidal zone on the west coastal zone of the bohai gulf, the average sedimentation rates of modern sediments are calculated. The results indicate that in the sandy area of the intertidal zone (from Daogouzi to the Duliujian River), the sedimentation rate from 1955 to 1963 is 3.43~4.06 cm/a, and is within the range of 0.65~1.59 cm/a since 1963. The average sedimentation rate in the muddy area (around Qikou) is approximately 1.81cm a^(-1). The results above suggest that the sandy area of the intertidal zone of the western coast of the Bohai Gulf had experienced rapid sedimentation from the 1950s to the 1960s, and the sedimentation sloweds after 1960s, and the sedimentation rates increased from the north to south spatially. The rapid sedimentation from the 1950s to the 1960s in the sandy area was due to the facts that North China had plentiful precipitation during this period and the intertidal zone was supplied with abundant material sources for sedimentation. After the 1960s, the weakened sedimentation might result from the decrease of sand transported to the intertidal zone, which was the consequence of diminished rainfall in North China and the intensive human activities in the Haihe basin.

关 键 词：渤海湾 潮间带 沉积速率 ^210PBEX ^137CS 

分 类 号：P736.21[天文地球—海洋地质] O644.2[天文地球—海洋科学]