覆膜旱作对稻田土壤有效Fe、Mn、Zn、Cu含量的影响

Changes of available Fe, Mn, Zn and Cu contents among different layers of non-flooded paddy soils with ground mulching.

以常规水作和裸地旱作作对照,对覆膜旱作栽培条件下稻田0～60cm土层土壤有效Fe、Mn、Zn、Cu含量变化进行了研究.结果表明:与常规水作相比,覆膜旱作稻田土壤有效铁含量在0～10cm土层略有下降,10～20cm土层有所增加,20～60cm土层相差不大;0～15cm土层土壤有效锌的含量有所上升,而在15～60cm土层中趋向一致;0～15cm土层土壤有效Mn含量有所下降,有效Cu含量变化不大.与裸地旱作相比,覆膜旱作增加了稻田0～20cm土层中土壤有效铁、0～15cm土层中有效锌含量,降低了0～5cm土层中有效锰含量,有效铜含量变化不大.

The change in amount of available Fe, Mn, Zn and Cu in various layers (from depth of 0 to 60 cm) of non-flooded paddy soil with ground mulching were studied. Compared with conventional flooded soil, non-flooded film mulching slightly reduced the amount of available Fe in the 0-10 cm layer of the soil, increased it in the 10-20 cm layer and had almost no effect in the 20-60 cm layer. The technique increased the amount of available Zn in the 0-15 cm soil layer and reduced the amount of available Mn in the 0-15 cm layer, but did not affect the available Cu content. Compared with dryland soil, non-flooded film mulching increased the amount of available Fe in the 0-20 cm layer and available Zn in the 0-15 cm layer of the soil and reduced the amount of available Mn in the 0-5 cm soil layer, but the amount of available Cu in the 0-60 cm soil layer was almost unaffected.