淹水种植水稻条件下磷元素的渗漏研究

为了探明淹水植稻条件下磷元素在土层中的垂直移动、渗漏情况,设置了模拟土柱培养试验。试验以淹水种植水稻为处理,以淹水不种水稻为对照,探讨植稻对模拟土柱(40 cm埋深处)渗漏水有机磷、无机磷、全磷的淋出数量的情况。结果表明,培养试验期间,磷肥在施肥初期渗漏量相对较大,主要集中在施肥后15 d内。无机磷、全磷从总体上看变化不大,流失量与施肥没有明显的相关性,说明磷比较稳定,易被土壤固定。从绝对数量看,模拟土柱中磷的渗漏主要以无机磷为主。淹作条件下,种植水稻与不种植水稻相比,其渗漏水全磷、无机磷的含量较低,而有机磷含量较高。

Phosphorus Leaching in Waterlogged Rice Condition

The question,whether Phosphorus taking place vertical transportation in the soil,remains not clear.Simulated soil column were adopted to study the potentiality of P moving vertically in the soil.In this article,the TP,IP and OP in the eluate of soil column were analyzed.Results showed that P leakage amounts were increased gradually in first 15 days after fertilizer application,but there was no significant correlation between P leakage amounts and fertilization amount.The concentrations of TP and IP in the eluate were great lower than that of OP,and IP was the dominant species in leaching water.