引用本文:李发东,杜锟,张秋英,古丛珂,冷佩芳,乔云峰,朱农,郝帅,黄勇彬,施生锦.华北平原农田N2O排放通量的高频动态观测[J].中国生态农业学报,2018,26(2):195-202
LI Fadong,DU Kun,ZHANG Qiuying,GU Congke,LENG Peifang,QIAO Yunfeng,ZHU Nong,HAO Shuai,HUANG Yongbin,SHI Shengjin.High-frequency dynamic observation of N2O emission flux from cropland in the North China Plain[J].Chinese Journal of Eco-Agriculture,2018,26(2):195-202
DOI:10.13930/j.cnki.cjea.171209
【打印本页】   【HTML】   【下载PDF全文】   查看/发表评论  下载PDF阅读器   关闭   
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 33次   下载 106 本文二维码信息
码上扫一扫!
分享到: 微信 更多
华北平原农田N2O排放通量的高频动态观测
李发东1,2,3, 杜锟1,2,3, 张秋英4, 古丛珂1,2,3, 冷佩芳1,2,3, 乔云峰1,2,3, 朱农1,2,3, 郝帅1,2,3, 黄勇彬4, 施生锦4
1.中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室 北京 100101;2.中国科学院禹城综合试验站禹城 251200;3.中国科学院大学资源与环境学院 北京 100190;4.北京雨根科技有限公司 北京 100094
摘要:  N2O是主要源自农田的重要温室气体之一,可破坏臭氧层而导致全球增温。目前对N2O的原位高频观测尚不多。为完善N2O的观测方法,为华北地区N2O变化研究提供参考,本研究以华北平原典型农田为研究对象,利用新型的N2O测定仪器TGA200A,进行实时、自动、昼夜连续地观测中国科学院禹城综合试验站农田大气N2O的日动态变化。本次观测自2017年6月中旬玉米播种后开始,持续至2017年9月(8月份仪器调试)。结果显示:1)晴朗天气下,农田大气N2O呈现出夜晚(0:00-6:00、18:00-24:00)高(0.618~1.171 mg·m-3)、白天(6:00-18:00)低(0.526~1.145 mg·m-3)的趋势,而白天高温又促进农田N2O排放,在午后15:00-17:00大多出现1次峰值,表明温度的促进作用存在滞后性。2)降雨天气下,农田N2O在适当的雨量下逐渐增加(3 h内增加0.033 mg·m-3),且存在累积效应,但过度淹水后N2O表现出逐渐降低的趋势。3)大风天气下,N2O的浓度产生变化,但规律并不明显。研究结果表明,利用TGA200A可以实现对温室气体N2O的实时、连续、动态的自动观测,观测结果具有较高可信度,可以反映出当前华北地区农田N2O在不同环境要素(温度、降水及大风)下的动态变化趋势。
关键词:  华北平原  农田生态系统  N2O排放  通量监测  高频监测
中图分类号:X51;S-3
基金项目:国家自然科学基金项目(41771292,31170414)和国家重点研发计划项目(2016YFD0800301)资助
High-frequency dynamic observation of N2O emission flux from cropland in the North China Plain
LI Fadong1,2,3, DU Kun1,2,3, ZHANG Qiuying4, GU Congke1,2,3, LENG Peifang1,2,3, QIAO Yunfeng1,2,3, ZHU Nong1,2,3, HAO Shuai1,2,3, HUANG Yongbin4, SHI Shengjin4
1.Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;2.Yucheng Comprehensive Experiment Station, Chinese Academy of Sciences, Yucheng 251200, China;3.College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100190, China;4.Rainroot Scientific Limited, Beijing 100094, China
Abstract:  Nitrous oxide (N2O) is one of the primary greenhouse gases, which depletes ozone sphere and results in strong greenhouse effects. Nowadays, a series of studies on greenhouse gases emissions of vegetation-soil-atmosphere system has been carried out domestic and overseas with the measurement method of static chamber/gas chromatograph, in which gas sampling time is concentrated in a fixed period during daytime rather than around the clock. Moreover, its' sampling frequency is usually longer than one minute inducing difficulty to implement a real-time, high-frequency and continuous determination of greenhouse gas emissions in situ for a long time. As an important source of N2O emission, farmland ecosystem is a human-disturbed system with fast N recycle and large N2O emission. To improve N2O emission observation methods and provide a reference for N2O change study in the North China Plain, we chose a typical farmland ecosystem, a maize field at the Yucheng Comprehensive Experiment Station, Chinese Academy of Sciences, and monitored N2O concentration change with a new monitor instrument TGA200A (Trace Gas Analyzer 200A) to achieve a automatically real-time monitoring of N2O emission for day and night. The TGA200A was equipped with a laser launch tube simultaneously controlled by current and temperature and some related measuring devices. When sample and reference gases (with a known concentration) entered the analyzer synchronously, the target gas concentration was determined by through scanning and comparing the linear absorption wavelengths of laser energy between sample and reference gases. The monitoring was from the middle of June 2017 to September 2017. The results showed, firstly, the N2O emission was higher in night from 0:00 to 6:00 and 18:00 to 24:00 (0.618-1.171 mg·m-3) than in daytime from 6:00 to 18:00 (0.526-1.145 mg·m-3) in fine weather. N2O emission was facilitated under higher atmospheric temperature in daytime, but the emission peak appeared in 15:00 to 17:00 indicating a significant hysteresis of temperature effect. Secondly, in rainy day, maize field N2O emissions were increased by 0.033 mg·m-3 in 3 hours with a proper rainfall and presented an accumulative effect. But if the rain was too heavy for a long time, the N2O emission would be reduced. Thirdly, N2O emission was affected by strong wind, but this conclusion needed more verification because such result was not regular. This study demonstrated the data determined by the TGA200A was useful and reliable for study on dynamic change of N2O emission in different weathers. TGA200A was available in an automatically and real-time monitor of N2O emission for day and night with different environment elements (temperature, rain, wind) and made it possible to reduce human costs and errors in greenhouse gas flux observation.
Keyword:  North China Plain  Farmland ecosystem  Nitrous oxide emission  Flux observation  High-frequency observation
您是第 2396126 位访问者  冀ICP备05003362号-2
版权所有 ©《中国生态农业学报》编辑部
地址:河北省石家庄市裕华区槐中路286号 050022 电话:0311-85818007 E-mail:editor@sjziam.ac.cn
技术支持:北京勤云科技发展有限公司