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试验研究不同磷肥施用量(0、50、250kgPhm-2),下辽河平原潜育性水稻土在水稻生长期间田面水和不同深度(30、60和90cm)土层渗滤液中可溶性磷(DP)浓度随时间的动态变化。研究结果表明,各施磷处理田面水和30cm处渗滤液DP浓度施磷后立即达到峰值,随后迅速下降并趋于稳定,且浓度随施肥量的增加而增加,均高于水体富营养化发生的阈值0.02mgL-1;各处理60cm和90cm处渗滤液中DP浓度一直稳定在0.01mgL-1左右,各处理间差异均不显著;各施磷处理土壤不同深度渗滤液中DP浓度均表现为60cm以上自上向下逐渐降低,60cm以下没有显著差异。
The effects of different P application rates (0, 50, and 250 kg Phm-2) on paddy soil and the leachate (30, 60 and 90 cm) Dynamic changes in concentration over time. The results showed that the surface water immediately after phosphorus application and the leachate DP concentration at 30 cm peaked immediately after phosphorus application, then decreased rapidly and stabilized, and the concentration increased with the increase of fertilizer application, which was higher than that of water eutrophication , And the threshold value of 0.02mgL-1. The DP concentration in leachate at 60cm and 90cm was stable at 0.01mgL-1 at all treatments, with no significant difference among treatments. The DP concentrations in leachate of different treatments were 60cm above gradually decreased from top to bottom, 60cm below no significant difference.