氮肥管理对^15N标记水稻秸秆氮吸收利用的影响  

Effects of nitrogen fertilizer management on nitrogen uptake and utilization of^15N labeled rice straw

作　　者：焦峰[1] 吕淑敏 李响[1] 唐雷 王秋菊[2] 刘峰[2] JIAO Feng;Lü Shu-min;LI Xiang;TANG Lei;WANG Qiu-ju;LIU Feng(Heilongjiang Bayi Agricultural University,Daqing Heilongjiang 163319;Institute of Soil Fertilizer and Environment Resources,Heilongjiang Academy of Agricultural Sciences,Harbin Heilongjiang 150086)

机构地区：[1]黑龙江八一农垦大学,黑龙江大庆163319 [2]黑龙江省农业科学院土壤肥料与资源环境研究所,黑龙江哈尔滨150086

出　　处：《中国土壤与肥料》2020年第2期154-158,共5页Soil and Fertilizer Sciences in China

基　　金：国家科技支撑计划子课题(2015BAD23B05-07);国家重点研发计划子课题(2016YFD0300902-05)。

摘　　要：利用^15N同位素示踪技术,通过盆栽模拟试验揭示氮肥管理方式对水稻秸秆氮吸收利用的影响,设置基肥氮素在插秧前施入和基肥氮素与秸秆同时施入(调节C/N)两个处理,试验结果表明,秸秆中的氮素可以作为下茬作物生长的有效氮源;基肥氮素与秸秆同时施入(调节C/N)处理秸秆氮的利用率显著高于基肥氮素在插秧前施入,水稻从^15N秸秆标记物中摄取氮的比例(NdfS)明显低于土壤肥料中氮(NdfS+F);水稻地上植株对秸秆氮的综合利用率为6.51%~7.99%,其中,茎叶秸秆氮利用率为1.40%~1.75%,穗利用率为5.11%~5.25%。在秸秆还田的条件下,基肥氮素与秸秆同时施入,可以显著提高水稻对秸秆氮素的吸收能力。Using^15 N isotope tracer technique,the effects of nitrogen fertilizer management on nitrogen uptake and utilization of rice straw were revealed through pot simulation experiments.Two treatments were set up in the experiment:the application of base nitrogen fertilizer before transplanting(T1)and the application of base nitrogen fertilizer and straw at the same time with adjusting C/N ratio(T2).The results of pot experiment showed that nitrogen use efficiency of T2 treatment was significantly higher than that of T1 treatment.Nitrogen uptake by rice from^15N straw(NdfS)was significantly lower than that in soil and fertilizer(NdfS+F).The comprehensive utilization rate of straw nitrogen for rice aboveground plants was 6.51%~7.99%,of which the utilization rate of straw nitrogen for stems and leaves was 1.40%~1.75%,and the utilization rate for panicles was 5.11%~5.25%.Under the condition of straw returning to the field,the nitrogen absorption capacity of rice to straw cloud be significantly improved by applying base fertilizer and straw simultaneously.

关 键 词：^15N 秸秆氮 水稻 秸秆氮利用率 

分 类 号：S511[农业科学—作物学]