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通过对不同宽度及其上种豆与否的稻田田埂内外侧0~60 cm剖面速效磷浓度及贮量的变化情况监测,分析了田埂宽度与种豆对稻田速效磷可能经田埂侧渗流失的影响。不种豆条件下,田埂宽度由40 cm增厚至50 cm和60 cm,速效磷向田埂外侧迁移,平均可减少2.19 kg hm~(-2)和2.36 kg hm~(-2);种植大豆条件下,田埂宽度增厚至50 cm和60 cm,速效磷可减少2.69 kg hm~(-2)和5.08 kg hm~(-2)。田埂上种植大豆可使内、外剖面间速效磷贮量差提高7.9%。尽管大豆吸收有助于降低田埂速效磷浓度,但由于大豆根系会在田埂中造成大孔隙,因此田埂种植大豆时应适当加宽田埂,以减小速效磷侧渗流失风险。田埂中40~60 cm土层水分充足,速效磷浓度、贮量均较高,可能是稻田速效磷侧渗流失的主要通道。
By monitoring the changes of available phosphorus content and stock volume at the 0 ~ 60 cm section in the paddy fields of different widths and the seeds planted on the paddy fields, the effects of paddy field width and the soybean yield on the potential lateral infiltration loss of paddy field available phosphorus influences. Under the condition of no beans, the width of field ridges increased from 40 cm to 50 cm and 60 cm, and the available phosphorus migrated to the outer side of field 田, which could reduce 2.19 kg hm -2 and 2.36 kg hm -2 on average. Under the conditions, the width of field ridges increased to 50 cm and 60 cm, and the available phosphorus decreased 2.69 kg hm -2 and 5.08 kg hm -2. Soybeans on soybean fields can increase the difference between the available and available phosphorus reserves in the inner and outer sections by 7.9%. Although soybean absorption helps to reduce the available phosphorus concentration in the field, due to the large pores caused by the soybean root system, it is necessary to widen the fields when planting soybean so as to reduce the risk of loss of readily available phosphorus. The soil of 40-60 cm layer in Tianzhu was abundant in water with high available phosphorus concentration and storage capacity, which may be the main channel for the loss of available phosphorus in paddy fields.