基于长光程的土壤氧化亚氮排放规律的FTIR光谱法研究  

A Study of FTIR Spectrometry Based on a Long Optical Path on the Emission Rules of Nitrous Oxide from Soil

作　　者：肖广东 郑玲[2] 董大明[2] 张东彦[1] 张保华[2] 廖同庆[1] 

机构地区：[1]安徽大学电子信息工程学院,安徽合肥230039 [2]北京农业智能装备技术研究中心北京市农林科学院,北京100097

出　　处：《光谱学与光谱分析》2015年第11期3063-3067,共5页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(61134011;41301471);博士点基金项目(20123401120008)资助

摘　　要：氧化亚氮（N2O）的过量排放会对臭氧层造成破坏,合理施肥和采取减排措施对减缓温室效应具有重要的现实意义。本文利用FTIR光谱法研究了施肥和水分对白菜地土壤排放N2O的影响。为了提高系统的灵敏度,我们利用多个反射镜加长了光程。通过比对施肥前后N2O红外光谱和NIST谱库N2O红外光谱,最终选取2 160~2 225cm-1作为定量计算N2O的特征波段。研究发现,施肥和水分能促进白菜地土壤N2O气体排放,这为农田N2O的减排和减缓温室效应提供了理论依据。最后,还研究了施肥后土壤N2O的昼夜排放规律,结果表明,N2O白天的排放量高于晚上,通过和前人研究结果对比,验证了此方法的可行性。本文研究证实,基于长光程的FTIR光谱法是一种测量土壤排放N2O气体规律的快速有效方法,它可以对施肥后的白菜地土壤N2O气体排放进行测量,相对其他传统测量方法具有高速、简便等优势。The excessive emission of N2O（Nitrous oxide）will destroy the ozone layer,reasonable fertilization and adopting measures of emission reduction of N2 O are of great significance to slowing down the greenhouse effect.The article studied the impact of fertilization and water on the emission of N2 O from the cabbage farmland using FTIR spectrometry.To enhance the sensitivity of the measuring system,we used multi-reflecting mirrors to increase the optical pathlength.By comparing the infrared spectra between the before and after fertilizer application and the NIST spectral library,finally,the band at 2 160~2 225cm-1 was chosen as the spectral characteristics band of quantitative calculation of N2 O through analyzing.The research found that fertilization and water could promote the emission of N2 O from the cabbage farmland soil,which could supply theory bases for emission reduction of N2 O and slowing down the greenhouse effect.Finally,we also studied the diurnal emission rules of N2 O from the fertilized soil;the results showed that the emission of N2 O was lower at night and the results were compared with that of previous＇ studies,which verifies the feasibility of this method.The results proved that FTIR with long optical path was a rapid and effective method to measure the emission rules of N2 O from the cabbage farmland soil,which can measure the gas emissions of N2 O from the fertilized cabbage farmland soil and compared with other traditional measuring methods,it had the advantages such as rapidness and convenience.

关 键 词：傅里叶变换红外光谱 土壤 氧化亚氮 气体排放 

分 类 号：S131[农业科学—农业基础科学]