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首页> 外文期刊>Limnology >Distinguishable root plaque on root surface of Potamogeton crispus grown in two sediments with different nutrient status
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Distinguishable root plaque on root surface of Potamogeton crispus grown in two sediments with different nutrient status

机译：在两种养分状况不同的沉积物中生长的Potamogeton crispus根表面的可分辨根斑

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The properties of plaques were different on the root surface of Potamogeton crispus planted in sediments from two different shallow lakes. Lake Tangxunhu sediment, with low pH, contained low organic matter, whereas Lake Yuehu sediment, with high pH, had high calcium deposits mixed with high organic matter. The contents of mineral elements in sediment of Lake Tangxunhu was lower than that of Lake Yuehu, except for iron (Fe) content, but the contents of mineral elements extracted by sodium dithionite-sodium citrate-sodium bicarbonate (DCB) from root plaques were higher in Lake Tangxunhu than those in Lake Yuehu, except for Fe. These element distributions on P. crispus root plaques were characterized by scanning electron microscope combined with energy-dispersive X-ray spectrometer and were consistent with the contents of mineral elements in sediment. The root plaque of P. crispus planted in Lake Tangxunhu sediment mainly contained silicon (Si) and Fe, and the content of Si was greater than Fe, which may be contributed to the formation of poly-silicic-ferric in the natural conditions. However, the root plaque of P. crispus planted in the sediment with higher calcium content of Lake Yuehu was rich in Fe, Si, phosphorus (P), and calcium (Ca). Due to oxygen secretion by plant roots, the root plaque has more Fe_3(PO_4)_2 and a certain amount of Ca_3(PO_4)_2. The ratio of magnesium (Mn) to Fe extracted by DCB from root plaque in Lake Tangxunhu sediment was 0. 031 and 0. 010 in Lake Yuehu sediment. In Lake Tangxunhu sediment, lower content of organic matter results in weak reducibility. Enhanced oxidation ability by oxygen secretion of P. crispus root could oxidize low-valent Fe and Mn into iron-manganese oxide, which leads to formation of iron-manganese plaque on the root surface. However, this case is different in Lake Yuehu sediment, where Fe and Mn can be reduced in high organic sediment and low-valent Mn can precipitate in the sediment in which pH is >8. Thus, low-valent Fe in Lake Yuehu sediment moves to the root surface of P. crispus, where it oxidizes into Fe oxide, i. e., Fe plaque.
机译：在两个不同的浅湖沉积物中种植的Potamogeton crispus根表面的菌斑性质不同。 pH值低的塘x湖沉积物有机质含量低，pH值高的岳湖沉积物中钙质沉积量高，有机质含量高。除铁（Fe）含量外，塘elements湖沉积物中矿质元素含量均低于岳湖，但连二亚硫酸钠-柠檬酸钠-碳酸氢钠（DCB）从根斑中提取的矿质元素含量较高。除铁外，唐x湖的水比岳湖的多。扫描电镜结合能量色散X射线能谱仪表征了香菇根斑上的这些元素分布，并与沉积物中的矿质元素含量相吻合。唐Tang湖沉积物中种植的香菇根斑主要含有硅和铁，且硅含量高于铁，这可能是自然条件下形成聚硅铁的原因。然而，岳湖中含钙量较高的沉积物中种植的P. crispus根斑富含Fe，Si，磷（P）和钙（Ca）。由于植物根系的氧分泌，根斑具有更多的Fe_3（PO_4）_2和一定量的Ca_3（PO_4）_2。 DCB提取的汤循湖沉积物根斑中镁与铁的比例分别为0. 031和0. 010。在塘x湖沉积物中，有机质含量较低会导致还原性较弱。 P.cristus根的氧分泌增强的氧化能力可以将低价的Fe和Mn氧化成铁锰氧化物，从而在根表面形成铁锰斑。但是，这种情况在岳湖沉积物中不同，在高有机沉积物中，Fe和Mn可以还原，而在pH大于8的沉积物中，低价Mn可以沉积。因此，月湖沉积物中的低价铁移至P. crispus的根表面，在其中氧化成Fe氧化物，即。例如，铁斑。

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