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长期连续的湿地水稻栽培,常造成土壤形态及特性方面的特征变化,包括表层土色变灰及铁锰累积层发育。应该指出,只有在排水良好的土壤中才有这种因水耕种稻而发生的特征变化。排水良好的水稻土的特征与其特有的水分状况密切相关。维持排水良好的土壤连续90天左右淹水,而没有人为地不断灌溉,几乎是不可想像的,由于人为灌溉使具有特有的水分状况,即在淹水的同时发生有渗漏作用,且在排水后继续进行氧化作用。
Long-term continuous wetland rice cultivation often leads to the characteristics of soil morphology and characteristics changes, including the top soil gray and iron-manganese accumulation layer development. It should be noted that this characteristic change, which occurs as a result of hydroponic rice cultivation, is only found in well-drained soils. The characteristics of well-drained paddy soil are closely related to its peculiar water status. It is almost unthinkable to maintain a well-drained soil for about 90 days without any artificial irrigation, which has a peculiar water condition due to artificial irrigation, that is, leakage occurs simultaneously with flooding, Continue oxidation.