长期施肥配施DCD处理对菜地土壤N2O短期排放影响的模拟研究OA北大核心CSTPCD
Simulation on short-term emission of N2O from vegetable soil under long-term fertilization combined with DCD treatment
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(N2O)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15d内的CO2、N2O、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CO2累积排放量分别为25.39～52.01 mg·kg-1和62.35～122.80 mg·kg-1,N2O累积排放量分别为6.02～16.60 μg·kg-1和14.45～117.78 μg·kg-1,CH4累积排放量分别为-3.17～14.87 μg·kg-1和4.09～23.56 μg·kg-1.与15℃相比,25℃条件下除FOM处理外,其他处理N2O与CO2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CO2 排放都显著降低;在25℃下,OMD、FD、FOM处理N2O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N2O累积排放量差异均不明显.短期排放模拟研究显示,CO2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N2O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 N2O 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 CO2,N2O,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 CO2 emissions under 15℃ and 25℃ were 25.39-52.01 mg·kg-1 and 62.35-122.80 mg·kg-1,respectively;the total N2O emissions were 6.02-16.60 μg·kg-1 and 14.45-117.78 μg·kg-1 respectively,the total emissions of CH4 are-3.17-14.87 μg·kg-1 and 4.09-23.56 μg·kg-1.All treatments except FOM showed significantly higher N2O and CO2 emissions at 25℃ compared with 15℃ (P<0.05).Compared with OM and OMD,CO2 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 N2O emissions were significantly reduced by OMD,FD,and FOM(P<0.05).At 15℃,there was no significant difference in N2O cumulative emissions among all treatments.Short-term indoor simulated incubation experiment indicated that CO2 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,N2O emissions in vegetable fields could be reduced by long-term DCD application or manure combined with chemical fertilizer.The results of this study can provide a fundamental theory regarding greenhouse gas emissions resulting from the long-term use of DCD in vegetable fields.
陈安琦;郑祥洲;郭宝玲;王煌平;张玉树
福建农林大学资源与环境学院,福州 350002||福建省农业科学院资源环境与土壤肥料研究所,福州 350013福建省农业科学院资源环境与土壤肥料研究所,福州 350013
农业科学
长期施肥DCDN2O排放温度培养试验
long-term fertilizationDCDN2O emissiontemperatureculture experiment
《农业资源与环境学报》 2024 (004)
807-815 / 9
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) Sci-Tech Innovation Team Project of Fujian Academy of Agricultural Sciences(CXTD202102-2);"5511"Collaborative Innovation Project(XTCXGC2021009);Talent Project of Fujian Academy of Agricultural Sciences(YC2021010);Fujian Provincial Public Research Institute of Fundamental Research(2023R1073)
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