摘要
以传统漫灌常规常量追氮为对照(CK),采用静态暗箱-气相色谱法测定浅埋滴灌下常量追氮(T1)和优化追氮(T2:70%常量追氮)春玉米田生育期内CO2、N2O和CH4排放特征,探究西辽河平原浅埋滴灌条件下优化施氮对春玉米田土壤温室气体排放的影响。结果表明,T1和T2处理玉米产量无显著差异,均显著高于CK(P<0.05)。相同施氮量下,浅埋滴灌相比传统漫灌N2O排放量增加11.78%,CH4吸收量降低34.78%;T2较T1处理CO2和N2O排放量分别减少13.15%和20.27%。相同施氮量下,与CK相比,T1处理降低了温室气体排放强度(GHGI)(P<0.05),浅埋滴灌T2处理GHGI较T1处理降低10.46%;CK和T1处理综合增温潜势(GWP)均显著高于T2(P<0.05);T1和T2处理净生态系统经济预算(NEEB)均显著高于CK(P<0.05)。综合来看,浅埋滴灌下T2处理,既降低了GHGI和GWP,又保证了较高玉米产量和NEEB,是西辽河平原玉米兼顾高产、高效和生态的水氮管理模式。
In order to explore effects of optimized nitrogen application on the greenhouse gas emissions in spring maize fields under the shallow drip irrigation in the Xiliaohe Plain,characteristics of CO2,N2 O and CH4 emission during the growth period of the constantnitrogen topdressing(T1)and optimized nitrogen topdressing(T2:70%constant nitrogen topdressing)under shallow drip irrigation were determined using method of static dark box-gas chromatography and adopting conventional irrigation with conventional constant nitrogen topdressing as a control(CK).The results showed that there was no significant difference in maize yield between T1 and T2 treatments,both of which were significantly higher than CK(P<0.05).Compared with the traditional irrigation under the N2 O emission of shallow drip irrigation increased by 11.78%and the CH4 uptake was reduced by 34.78%;compared with T1,the CO2 and N2 O emissions of T2 reduced by 13.15%and 20.27%,respectively.Under the same nitrogen application,the shallow drip irrigation reduces GHGI(P<0.05)compared with traditional irrigation,and the GHGI of T2 decreases by 10.46%compared with that of T1;the GWP of CK and T1 were significantly higher than that of T2(P<0.05);the NEEB of T1 and T2 were significantly higher than that of CK(P<0.05).In general,the treatment of T2 reduces GHGI and GWP,and ensure higher maize yield and NEEB,which is a water and nitrogen management model for maize in the Xiliaohe plain that combines high yield,high efficiency and ecology.
作者
李锐
杨恒山
邰继承
马日亮
薛明强
LI Rui;YANG Heng-shan;TAI Ji-cheng;MA Ri-liang;XUE Ming-qiang(College of Agronomy,Inner Mongolia University for Nationalities,Engineering Research Center of Forage Crops of Inner Mongolia Autonomous,Tongliao 028042;Agricultural Technology Extension Station of Inner Mongolia Autonomous Region,Hohhot 010010,China)
出处
《玉米科学》
CAS
CSCD
北大核心
2020年第6期154-161,共8页
Journal of Maize Sciences
基金
国家重点研发计划项目(2017YFD0300805)
内蒙古自治区自然科学基金项目(2018MS03059)。
关键词
春玉米
浅埋滴灌
优化施氮
温室气体
Spring maize
Shallow-buried drip irrigation
Optimize nitrogen application
Greenhouse gas
