Reconstruction of the historical deposition environment from ²¹⁰Pb and ¹³⁷Cs records at two tidal flats in China

作者

Zhiyong Liu, Shaoming Pan, Yong Yin, Renfeng Ma, Jianhua Gao, Fei Xia, Xu Yang.

期刊名、年、卷、期、页

Ecological Engineering, 2013,61:303-315.

摘要

To examine the historical depositional environment with the evolution of vegetation at tidal flats, sediment samples were collected and grain-size distribution, ¹³⁷Cs and ²¹⁰Pb characteristics, heavy metals content, stratigraphy and the vegetation information were measured at Linhong and Chongming Dongtan tidal flat in China. Sediment grain size parameters exhibited transitional lines of the unvegetated flat to the vegetated flat. The vertical profiles of the ¹³⁷Cs and ²¹⁰Pb_ex reflected different depositional environment at the tidal flats. The linear/slumps profiles of ²¹⁰Pb_ex indicated complex hydrodynamics or rapid changes in sediment supply. The maximum peaks of ¹³⁷Cs activity were observed in some cores. The sedimentation rates from the ¹³⁷Cs maximum deposition peaks in 1963–1964 were comparable with the results from the ²¹⁰Pb_ex-CRS (Constant Rate of Supply) method. Positive relationships between the average activities of ¹³⁷Cs, ²¹⁰Pb_ex, inventory of ²¹⁰Pb_ex and the mean clay composition, suggested that grain size control effect was an important factor to influence the characteristics of ¹³⁷Cs and ²¹⁰Pb distribution at the tidal flats. For heavy metals, only Hg, Cd and Cr were moderately polluted at the Linhong tidal flat and the Chongming Dongtan, respectively. Integrating the results above and the stratigraphy, the vegetation introduction historical information, the clearer sedimentation evolution processes of the tidal flats were reconstructed, which is necessary for the coastal zone management and the pollution evaluation.

影响因子：2.958

分区情况：三区

链接：

http://www.sciencedirect.com/science/article/pii/S0925857413003753