摘要
为研究长期不同肥源配施双氰胺(Dicyandiamide,DCD)对菜地土壤氧化亚氮(N_(2)O)等温室气体短期排放规律的影响,本研究以长期不同肥源配施DCD的定位试验土壤为研究对象,通过短期室内模拟培养试验,研究牛粪(OM)、化肥(F)、牛粪+DCD(OMD)、化肥+DCD(FD)和1/2化肥+1/2牛粪(FOM)5个处理在不同温度下15 d内的CO_(2)、N_(2)O、CH4动态变化特征和累积排放量。结果表明:15℃和25℃条件下各施肥处理CO_(2)累积排放量分别为25.39~52.01 mg·kg^(-1)和62.35~122.80 mg·kg^(-1),N_(2)O累积排放量分别为6.02~16.60μg·kg^(-1)和14.45~117.78μg·kg^(-1),CH4累积排放量分别为-3.17~14.87μg·kg^(-1)和4.09~23.56μg·kg^(-1)。与15℃相比,25℃条件下除FOM处理外,其他处理N_(2)O与CO_(2)累积排放量均显著增加(P<0.05)。相比于OM和OMD处理,F、FD、FOM处理在两种温度条件下CO_(2)排放都显著降低;在25℃下,OMD、FD、FOM处理N_(2)O排放峰值和累积排放量较OM和F处理显著降低(P<0.05),在15℃下,所有处理N_(2)O累积排放量差异均不明显。短期排放模拟研究显示,CO_(2)排放量与土壤pH、总氮(TN)含量呈极显著正相关,与速效磷(Olsen-P)含量呈极显著负相关,15℃条件下CH4累积排放量与土壤有机质(SOM)呈极显著正相关(P<0.01)。研究表明,较高温度条件下,与有机肥或化肥单施相比,长期配施DCD或有机无机配施能显著减少菜地土壤N_(2)O排放。研究结果可为长期施用DCD的菜地土壤温室气体排放提供参考。
To investigate the effects of long-term dicyandiamide(DCD)application on N_(2)O and other greenhouse gas flux from vegetable fields,an incubation experiment was conducted.Soil samples were collected from a long-term localization experiment using different fertilizers in conjunction with DCD,and the dynamic changes and cumulative emissions of CO_(2),N_(2)O,and CH4 were investigated using gas chromatography.A short-term indoor simulated incubation experiment was conducted with five treatments:cattle manure(OM),chemical fertilizer(F),cattle manure+DCD(OMD),chemical fertilizer+DCD(FD),and 1/2 chemical fertilizer+1/2 cattle manure(FOM)at different temperatures for 15 days.The total CO_(2)emissions under 15℃and 25℃were 25.39-52.01 mg·kg^(-1)and 62.35-122.80 mg·kg^(-1)respectively;the total N_(2)O emissions were 6.02-16.60μg·kg^(-1)and 14.45-117.78μg·kg^(-1)respectively,the total emissions of CH4 are-3.17–14.87μg·kg^(-1)and 4.09-23.56μg·kg^(-1).All treatments except FOM showed significantly higher N_(2)O and CO_(2)emissions at 25℃compared with 15℃(P<0.05).Compared with OM and OMD,CO_(2)emissions under both temperature conditions were significantly reduced by the treatments of F,FD,and FOM.At 25℃,compared with OM and F,the peak and cumulative N_(2)O emissions were significantly reduced by OMD,FD,and FOM(P<0.05).At 15℃,there was no significant difference in N_(2)O cumulative emissions among all treatments.Short-term indoor simulated incubation experiment indicated that CO_(2)emissions were significantly positively correlated with soil pH and total nitrogen(TN)content,and negatively correlated with Olsen-P content.There was a significant positive relationship between CH4 emmissions and soil organic matter(SOM)under 15℃conditions(P<0.01).The results of this study indicated that compared with manure or chemical fertilizer alone at high-temperature conditions,N_(2)O emissions in vegetable fields could be reduced by long-term DCD application or manure combined with chemical fertilizer.The results of t
作者
陈安琦
郑祥洲
郭宝玲
王煌平
张玉树
CHEN Anqi;ZHENG Xiangzhou;GUO Baoling;WANG Huangping;ZHANG Yushu(College of Resources and Environment,Fujian Agriculture and Forestry University,Fuzhou 350002,China;Institute of Resources,Environment and Soil Fertilizer,Fujian Academy of Agricultural Sciences,Fuzhou 350013,China)
出处
《农业资源与环境学报》
CAS
CSCD
北大核心
2024年第4期807-815,共9页
Journal of Agricultural Resources and Environment
基金
福建省农业科学院科技创新团队项目(CXTD202102-2)
“5511”协同创新工程(XTCXGC2021009)
福建省农业科学院英才项目(YC2021010)
福建省属公益类科研院所基本科研专项(2023R1073)。
