摘要
利用桶栽试验探究不同浓度水平的聚天门冬氨酸钙盐(PASP-Ca)对水稻田面水中铵态氮(NH_4^+)、硝态氮(NO_3^-)和总氮(TN)浓度动态变化的影响。结果表明,施氮后,田面水中TN、NH_4^+和NO_3^-分别于第1,3,9天达到最大值,随后逐渐降低。NO_3^-/TN多在0.1以下,(NH_4^++NO_3^-)/TN多在0.5以上。因此,可以将NH_4^+和TN作为农田水污染防治的主要监测指标,NO_3^-作为辅助指标。添加一定浓度的PASP—Ca能对田面水中氮素浓度的变化起到缓释作用,其中0.3%浓度水平的PASP—Ca效果相对较好,田面水中NH_4^+和TN的下降速率分别为3.452,4.806mg/(L·d),与单施氮肥(CK)相比,分别降低了11.68%和16.25%;同时,NH_4^+的平均浓度为6.999mg/L,较CK低了3.88%;NO_3^-的平均浓度为0.396mg/L,较CK低了24.83%;TN的平均浓度为20.077mg/L,较CK提升了3.10%。施氮后田面水中TN浓度随时间呈对数递减,而NH_4^+浓度在施氮后3天内随时间呈对数增加,之后随时间呈对数递减趋势。施氮后的9天内是防止稻田田面水中氮素流失的关键时期。
A barrels planted experiment was conducted to study the effects of PASP-Ca with different concentration levels on the dynamic changes of NH4+,NO3-and total nitrogen(TN)concentrations in surface water of paddy field.The result showed that the concentrations of TN,NH4+and NO3-in the surface water of paddy field reached the maximum within1day,3days and9days respectively after nitrogen application.NO3-/TN was less than0.1and(NH4++NO3-)/TN was more than0.5.Therefore,NH4+and TN could be used as the main monitoring indicators,and NO3-as an auxiliary indicator for the prevention and control of farmland water pollution.Adding a certain concentration of PASP-Ca had slow release effects for the changes of nitrogen concentrations in surface water of paddy field,while the effects of PASP-Ca at0.3%concentration level was relatively better,the reduction rates of NH4+and TN in surface water of paddy field were3.452mg/(L·d)and4.806mg/(L·d)respectively.Compared with apply nitrogen only(CK),the reduction rates by11.68%and16.25%.Meanwhile,the average concentration of NH4+was6.999mg/L,which was3.88%lower compared with CK.The average concentration of NO3-was0.396mg/L,which was24.83%lower compared with CK.The average concentration of TN was20.077mg/L,which was3.10%higher compared with CK.The dynamic changing trends of NH4+and TN concentrations with time could be expressed by logarithmic equations.After nitrogen application,the TN concentrations in paddy field decreased logarithmically with time,while the concentrations of NH4+increased logarithmically in3days,and then decreased logarithmically with time.9days after nitrogen application was the key stage to prevent nitrogen loss in surface water of paddy field.
作者
董世杰
鲁屹
唐婉莹
刘琪
程梦笛
张庆国
杨书运
马友华
DONG Shijie;LU Yi;TANG Wanying;LIU Qi;CHENG Mengdi;ZHANG Qingguo;YANG Shuyun;MA Youhua(School of Resources and Environment, Anhui Agricultural University,Hefei 230036;School of Science, Anhui Agricultural University, Hefei 230036)
出处
《水土保持学报》
CSCD
北大核心
2018年第6期208-213,221,共7页
Journal of Soil and Water Conservation
基金
国家重点研发计划项目(2016YFD0800503)
关键词
聚天门冬氨酸钙盐
水稻田面水
三氮
动态变化
PASP-Ca
surface water of paddy field
NH 4 +, NO 3 -and total nitrogen
dynamic change
作者简介
第一作者:董世杰(1992-),男,在读硕士研究生,主要从事应用气象研究。E-mail:dongshijiework@163.com;通信作者:杨书运(1972-),男,教授,硕士生导师,主要从事农业气象研究。E-mail:yangshy@ahau.edu.cn.
