Bioturbation in near-surface sediments from the COMRA Polymetallic Nodule Area: evidence from excess ^210Pb measurements

编号 zgly0000350285

文献类型 期刊论文

文献题名 Bioturbation in near-surface sediments from the COMRA Polymetallic Nodule Area: evidence from excess ^210Pb measurements

作者 YANGQunhui  ZHOUHuaiyang 

作者单位 GuangzhouInstituteofGeochemistry 

母体文献 Chinese Science Bulletin;中国科学通报: 英文版 

年卷期 2004,49(23)

页码 2538-2542

年份 2004 

分类号 Q178  X835 

关键词 COMRA  铅  测量方法  沉积物  活性  海洋生物  生态环境 

文摘内容 In order to evaluate bioturbation in sediments from the COMRA Polymetailic Nodule Area in the northeast tropical Pacific, excess ^210Pb profiles in sediments cores collected with multiple corers during R/V DAYANGYIHAO Environmental Program Cruise in 1998 were measured by direct gamma assay using Ortec HPGe GWL series well-type coaxial low background intrinsic germanium detectors. A steady-state diffusion model of excess ^210Pb profiles suggests that bioturbation mixing depths and biodiffusion coefficients are 16 cm and 2.75 cm2/a in East Zone, and 6 cm and 0.26cm^2/a in West Zone, respectively. Furthermore, the observations of macrofauna and measurements of total organic carbon (TOC) content in sediments suggest that bioturbation is directly controlled by species and abundance of benthic fauna, such as polychaete, and the bioturbation mixing depth and intensity are positively correlated with the organic matter content。