不同地下水位和施肥管理对水稻土有机质及氧化铁含量的影响

Effects of Water Table and Fertilization on Contents of Organic Matter and Iron Oxides in Paddy Soil

在长期定位试验中研究了不同地下水位和施肥管理对水稻土土壤中的有机质和氧化铁含量的影响。结果表明:施用有机肥和化肥均能促进土壤有机质含量的增加,且高量有机肥的施用和高地下水位更有利于土壤有机质的积累;土壤无定形氧化铁含量同时受到有机质含量和土壤水分的影响,与土壤有机质含量显著正相关。可见,可以通过施肥和灌溉来调控土壤有机质和氧化铁含量,以提升土壤肥力。

In order to explore the effects of different water table and fertilization treatments on organic matter and iron oxides in paddy soil, a long-term located experiment from 1982 was conducted. The results showed that both applying crop residue and chemical fertilizer can improve soil organic matter, and high crop residue application and high water table were more conducive to organic matter accumulation. Soil amorphous iron oxide was both affected by soil organic matter and soil moisture, and was positive correlated with soil organic matter. Therefore, to improve soil fertility can be realized by regulate and control soil organic matter and soil moisture through fertilization and irrigation.