期刊论文

Effects of Controlled-release Urea Application on Dynamics and Loss of Nitrogen in Runoff and Yield in Double-rice Cropping Field

中文

水土保持学报

1009-2242

2018

32

3

21-28

10.13870/j.cnki.stbcxb.2018.03.004

国家重点研发计划项目（2016YFD0201205） 省科技厅重点项目（2016NK2112） 省教育厅平台项目（16K040）

本校为第一机构

为了探究双季稻田典型自然降雨径流过程中氮(N)的输出特点,采用田间径流池法,通过长期田间定位试验,比较普通尿素(U)和控释尿素(CRU)减施稻田径流水中总氮(TN)、铵态氮(NH_4~+-N)和硝态氮(NO_3~--N)的动态变化及N素径流流失量和流失率。结果表明:稻田施肥初期出现N素径流峰值,是防控N素径流损失的关键时期。早、晚稻季生育期间施N处理径流水中以NH_4~+-N为主要形态,分别占TN径流损失量的64.5%~66.3%,61.0%~68.6%。早、晚稻季U处理径流水TN流失量(率)分别为5.6(2.2%),5.0(1.7%)kg/hm~2;CRU处理较U处理径流水TN流失量分别降低17.4%~34.1%,17.3%~ 37.7%;且随着N肥用量的减少,TN流失量(率)逐渐降低。...

In order to explore nitrogen (N)output characteristics in double-rice cropping field during the process of the typical natural rainfall runoff,the long-term experiment with common urea(U)and reduction of controlled-release urea(CRU)was conducted to study the dynamics of total nitrogen(TN),ammonium nitrogen(NH_4~+ -N)and nitrate nitrogen (NO_3~- -N)loss and loss ratio of runoff in paddy field.The results showed that N loss peaked in the early time of fertilization,which was the critical period to control N loss.NH_4~+ -N was the main form of N-applied treatments to runoff during early and late ...