膜孔肥液自由入渗土壤铵态氮运移和分布特性试验研究

Experimentation study on transports and distribution characteristic of without restrict fertile solution infiltration under film hole irrigation

通过室内膜孔肥液自由入渗试验,观测分析不同入渗时间和再分布过程中铵态氮运移和分布特性,结果表明:在肥液自由入渗过程中,铵态氮锋面运移滞后于土壤水分锋面,但土壤铵态氮含量和土壤含水率以膜孔为中心向外逐渐减小;在再分布初期,土壤铵态氮锋面和土壤水分锋面运移一致,土壤铵态氮含量和含水率以膜孔为中心向外逐渐减小,减小的速度变慢,但随着再分布时间延长,土壤铵态氮开始硝化成硝态氮,铵态氮含量减小,硝态氮含量增加。

Based on lab experiment on transports and distribution characteristic of NH4^ ＋ - N without restrict fertile solution infiltration under film hole irrigation. The results indicated that in the process without restrict fertile solution infiltration the transports of NH4^＋ - N wetting front is slower than that of soil water content, but the content NH4^ ＋ - N and soil water content gradually reduces take the center of film hole as the center. Again in redistributed initial period, the transports of NH4^ ＋ - N and soil water content of wetting front is consistent, the content NH4^ ＋ - N and soil water content gradually reduces take the center of film hole as the center and reduces the speed to slow down, but lengthens again along with the redistributed time, The NH4^ ＋ - N starts to transform NO3^ - - N, The NH4 ^＋ - N content reduces and the NO3^- - N content increase, this research for applying fertilizer the irrigation technology of film hole irrigation to establish the technology.