CSIR- National Institute of Oceanography, Regional Centre, Kochi, India.
CSIR- National Institute of Oceanography, Regional Centre, Kochi, India.
Mar Pollut Bull. 2021 Jul;168:112447. doi: 10.1016/j.marpolbul.2021.112447. Epub 2021 May 7.
This study in the Kochi backwaters (KBW) presents the distribution of 9 trace metals (Fe, Zn, Cu, Mn, Ni, Co, Cr, Cd, Pb) in different parts (root, stolon and leaf) of the common water hyacinth Eichhornia crassipes during three different seasons [Pre-Monsoon (PRM), Southwest Monsoon (SWM), and Northeast Monsoon (NEM)]. The hyacinth was collected from 4 sections upstream of the KBW where a saltwater barrage [Thannermukkom Barrage (TB)] prevents saltwater intrusion. Results showed that regardless of seasons, all the trace metals concentration in different parts of Eichhornia varied in the following order: roots > stolon > leaves. All the trace metals except Fe showed their highest concentration during the PRM when TB introduces stagnancy of the water upstream through flow restrictions. Instead, Fe was high during the SWM associated with increased river influx at that time. Overall results showed that the hydrographical alterations of TB upstream of KBW have clear imprints on the trace metals concentrated in the hyacinth Eichhornia crassipes.
本研究以高知河口水域（KBW）为对象，在三个不同季节（前季风期（PRM）、西南季风期（SWM）和东北季风期（NEM））采集了普通凤眼莲（Eichhornia crassipes）的不同部位（根、茎和叶），分析了 9 种痕量金属（Fe、Zn、Cu、Mn、Ni、Co、Cr、Cd 和 Pb）的分布情况。凤眼莲采集自 KBW 上游的 4 个区域，该区域有一个盐水堰（Thannermukkom 堰（TB）），可以防止海水入侵。结果表明，无论季节如何，凤眼莲不同部位的所有痕量金属浓度均遵循以下顺序：根＞茎＞叶。除 Fe 以外的所有痕量金属在 PRM 时浓度最高，此时 TB 通过限制水流导致上游水体停滞。相反，Fe 在与当时河流流入量增加相关的 SWM 时浓度较高。总体结果表明，KBW 上游 TB 的水文变化对凤眼莲中富集的痕量金属有明显影响。
