Influence of Plant on Geochemical Cycling of Iron and the Magnetic Properties of Intertidal Sediments in the Yangtze Estuary
Influence of Plant on Geochemical Cycling of Iron and the Magnetic Properties of Intertidal Sediments in the Yangtze Estuary
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发表时间：
2003
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通讯作者：
Han Xiao-fei
中科院分区：
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作者：
Han Xiao-fei
选择长江口芦苇植被滩涂的一个岩心（CYLWA-1）来研究植物对铁地球化学循环和沉积物磁性的影响。结果表明，沉积物大部分层位以Fe 2+ 为主，且随深度增加而增加，但14～20 cm 深度除外，由于活根分布丰富，Fe 3+ 占主导地位。在14～20 cm氧化层中，χ fd 、χ ARM 和χ ARM /SIRM 下降，表明亚铁磁性矿物粗化。相反，B CR 和SIRM/ χ 的明显增加表明不完美和反铁磁性矿物相对增加。表明亚铁磁性矿物在氧化环境下转化为不完美的反铁磁性氧化铁。
One core (CYLWA-1) from Phragrmites australis vegetated tidal flat, the Yangtz e Estuary, is selected to investigate the effect of plant on geochemical cycling o f iron and the magnetic properties of the sediments. The results show that Fe 2+ dominates in most layers of the sediments and increases with depth, except at a depth of 14～20 cm, where Fe 3+ dominates due to the abundant distribution of live roots. In the oxidized layer of 14～20 cm , χ fd , χ ARM and χ ARM /SIRM decline, sug gesting coarsening of ferrimagnetic minerals. On the contrary, the obvious incre ase in B CR and SIRM/ χ indicates relative increase of imperfect an ti-ferromagneti c minerals. It is suggested that ferrimagnetic minerals be transformed into impe rfect anti-ferromagnetic iron oxides under oxidizing environment.