Geochemical and biological recovery of the disturbed seafloor in polymetallic nodule fields of the Clipperton‐Clarion Fracture Zone (CCFZ) at 5,000‐m depth
Geochemical and biological recovery of the disturbed seafloor in polymetallic nodule fields of the Clipperton‐Clarion Fracture Zone (CCFZ) at 5,000‐m depth
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克利珀顿-克拉里昂断裂带 (CCFZ) 深度 5,000 米多金属结核区受干扰海底的地球化学和生物恢复
DOI：
10.4319/lo.2006.51.5.2033
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发表时间：
2006
影响因子：
4.5
通讯作者：
J. Etoubleau
中科院分区：
文献类型：
--
作者：
A. Khripounoff;J. Caprais;P. Crassous;J. Etoubleau
2004年6月，在Nodinaut巡航期间，获得了深度为5,000米的Clipperton-Clarion断裂带结核领域的环境数据。研究了26年前一艘挖泥船造成的物理扰动对沉积物的长期影响。我们把研究的重点放在它的轨迹上，它的底部仍然可见。该设备通过的第一个主要结果是清除了4厘米±0.5厘米的表层沉积物。在轨道上采集的这一受干扰沉积物的物理和化学性质没有随着时间的推移发生重大变化，而且自受干扰以来也没有显示出任何恢复。然而，沉积物中锰浓度的深度变化是一个例外，这种变化在轨迹上与周围未受干扰的沉积物中的类似，可以用海水中氧气随时间的扩散来解释。另一方面，用潜水器携带的呼吸仪RAP2在航迹上测得的生物活性与未受干扰的位置没有差别，这表明底栖动物已经完全恢复，水-沉积物界面的营养通量也是如此。
Environmental data were obtained on the nodule fields of the Clipperton‐Clarion Fracture Zone at 5,000‐m depth in June 2004 during the Nodinaut cruise. The long‐term effects of physical disturbance made by a dredge 26 yr ago on the sediment were investigated. We focused our study on its track, which is still visible on the bottom. The first major consequence of the passage of this equipment was to remove 4 cm ± 0.5 cm of superficial sediment. The physical and chemical properties of this disturbed sediment sampled in the track did not change significantly over time and has not shown any recovery since the disturbance. However, an exception was observed for depth variations of manganese concentration in the sediment, which were similar in the track to those in the surrounding undisturbed sediment and can be explained by the diffusion over time of oxygen from the sea water. On the other hand, the biological activity measured in the track with the respirometer RAP2 carried by the submersible Nautile did not differ from the unperturbed site, which suggests that the benthic fauna has completely recovered, as have nutrient fluxes at the water–sediment interface.