不同水分及施肥对垆土速效N、P变化的影响  

The Effects of Soil Moisture and Fertilization on the Changes of Available N and P in Loessial Soil

作　　者：李生秀[1] 王子华[1] 王喜庆[1] 

机构地区：[1]西北农业大学,陕西杨陵712100

出　　处：《干旱地区农业研究》1993年第S1期93-98,共6页Agricultural Research in the Arid Areas

摘　　要：在培养条件下,研究了垆土不施肥及施过磷酸钙,氯化铵,尿素,碳酸氢铵后,在6个不同水分条件下NO^-_3—N,NH^+_4—N,速效磷的变化。结果表明,不施及施磷后,土壤NO^-_3—N含量以指数方程Y=A·e^(b/t)随时间递增,NH^+_4—N含量在第一天有所增加,后迅速减少。施氮肥后,土块NO^-_3—N的含量以指数方程Y=A·e^b/ t^(1/2)随时间递增,而NH^+_4—N变化因氮肥品种不同而不同。水分含量对氮肥转化影响很大。水分越高,硝化越快,但水分对速效磷含量影响不明显。The changes of NO_3^- -N, NH_4^- -N and available P in Loessial soil without fertilization andwith applying superphosphate, ammonium chloride, urea, ammonium sulphate were studiedunder 6 different soil moisture treatments. The results show that the changes of NO_3^- -N couldbe fitted by exponential equation Y=A·e^(b/t), increasing with time while NH_4^+ - N increasedon the first day and then rapidly decreased. Also, after fertilization, NO_3^- -N increased withtime by exponential equation, Y=A·e(b/(1/2)t. However, the NH_4^+ - N changes were differentwith different types of N fertilizers. Although soil water content had no obvious influence onavailable P, it had gread influenco on the trasformation of N fertilizers: the higher the watercontent, the quicker the nitrification.

关 键 词：土壤水分 施用氮肥 硝化 指数方程 

分 类 号：S423[农业科学—植物保护]