多核素联合示踪珊瑚礁区颗粒物动力学过程

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摘要利用高纯锗γ谱仪对北部湾涠洲岛珊瑚礁区的沉降物、表层沉积物、柱状沉积物中多种放射性核素开展联合分析.在利用⁴⁰K、颗粒活性核素²³⁴Th_ex和⁷Be以及²³⁸U-²³²Th(²²⁸Ra)-⁴⁰K/10三角图解等多核素示踪手段共同证实涠洲岛西侧沉降物来源于表层沉积物再悬浮的基础上,联合使用过剩²¹⁰Pb的恒定通量恒定沉积速率模式定量计算了涠洲岛西侧海域两柱样(WZ16和WZ20)沉积速率分别为1.46x10^-3和2.25x10^-3cm/d,该结果仅为相邻站位沉降速率(295x10^-3和252x10^-3cm/d)的0.50%和0.89%,表明99%以上的沉降物会经历多次强烈的再悬浮过程,最终才能埋藏进入沉积柱样.此外,本研究发现具有较高沉降通量的涠洲岛西侧珊瑚礁区仍有较高的珊瑚幼体补充量,推测是由于强烈的生源沉积物再悬浮为珊瑚虫提供了丰富的异养能量来源.

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	罗柱
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	余克服

关键词 ：珊瑚礁, 放射性核素, 物源识别, 沉积速率, 再悬浮

Abstract：The naturally occurring radionuclides in the sinking particle, surface sediments, and sediment cores near the Weizhou Island in the Beibu Gulf were simultaneously analyzed by high purity germanium γ spectrometer in this study. The sinking particle at the west station of the Weizhou Island was mainly attributed to the strong sediment resuspension that was demonstrated by the combined evidences of ⁴⁰K, ²³⁴Th_ex, ⁷Be, and ²³⁸U-²³²Th(²²⁸Ra)-⁴⁰K/10 ternary diagram. Sediment accumulation rates (SAR) of two sediment cores (WZ16and WZ20) at the west stations of the Weizhou Island were calculated to be 1.46×10^-3 and 2.25×10^-3 cm/d using the constant flux and constant sedimentation rate model of excess ²¹⁰Pb. These ²¹⁰Pb derived-sediment accumulation rates were only 0.50% and 0.89% of the sediment sinking rates (295×10^-3 and 252×10^-3 cm/d) derived from sediment trap, quantitatively indicating strong sediment resuspension before the ultimate burial in sediment. Additionally, a high recruitment of coral larvae was observed at the west station with strong sediment resuspension. It was speculated that the strong biogenic sediment resuspension would provide sufficient heterotrophic energy for coral polyps.

Key words： coral reefs radionuclide source identification sedimentation accumulation rate resuspension

收稿日期: 2024-08-15

PACS:

X55

基金资助:国家自然科学基金资助项目(42276044);广西自然科学基金资助项目(2024GXNSFAA010449);广西南海珊瑚礁研究重点实验室开放基金联合资助项目(GXLSCRSCS2023003)

作者简介: 罗柱(1999-),男,壮族,广西河池人,广西大学硕士研究生,主要从事海洋珊瑚礁区的同位素示踪研究.2637716182@qq.com.

引用本文:

罗柱, 林武辉, 王一潼, 黄思宇, 余克服. 多核素联合示踪珊瑚礁区颗粒物动力学过程[J]. 中国环境科学, 2025, 45(3): 1576-1586. LUO Zhu, LIN Wu-hui, WANG Yi-tong, HUANG Si-yu, YU Ke-fu. Multi-radionuclides for quantifying marine particle dynamic processes in coral reef ecosystem. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(3): 1576-1586.

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