| 刘敏,张翀,巨晓棠,苏芳,陈新平,江荣风.箱体结构及计算方法对夏玉米农田N2O排放测定结果的影响[J].农业环境科学学报,2018,37(6):1284-1290. |
| 箱体结构及计算方法对夏玉米农田N2O排放测定结果的影响 |
| Effects of chamber size and calculation method on N2O emissions during the summer maize growing season |
| 投稿时间：2017-10-17 |
| DOI：10.11654/jaes.2017-1401 |
| 中文关键词: N2O排放 箱体结构 根系生长 计算方法 夏玉米农田 |
| 英文关键词: N2O emissions chamber size root growth calculation method summer maize field |
| 基金项目:公益性行业（农业）科研专项（201503106）；国家自然科学基金项目（31760153） |
| 作者 | 单位 | E-mail | | 刘敏 | 农田土壤污染防控与修复北京市重点实验室, 中国农业大学资源与环境学院, 北京 100193
钦州学院资源与环境学院, 广西 钦州 535000 | | | 张翀 | 农田土壤污染防控与修复北京市重点实验室, 中国农业大学资源与环境学院, 北京 100193 | | | 巨晓棠 | 农田土壤污染防控与修复北京市重点实验室, 中国农业大学资源与环境学院, 北京 100193 | juxt@cau.edu.cn | | 苏芳 | 农田土壤污染防控与修复北京市重点实验室, 中国农业大学资源与环境学院, 北京 100193 | sufang@cau.edu.cn | | 陈新平 | 农田土壤污染防控与修复北京市重点实验室, 中国农业大学资源与环境学院, 北京 100193 | | | 江荣风 | 农田土壤污染防控与修复北京市重点实验室, 中国农业大学资源与环境学院, 北京 100193 | |
|
| 摘要点击次数: 2615 |
| 全文下载次数: 3079 |
| 中文摘要: |
| 为探讨不同箱体结构及计算方法对夏玉米农田N2O排放测量结果的影响，于2012-2013年在中国农业大学曲周实验站采用静态箱-气相色谱法研究了4个处理在夏玉米季N2O排放结果，即大箱+直线算法、小箱+直线算法、大箱+曲线并直线算法及小箱+曲线并直线算法。小箱顶部中央留孔使玉米茎能够通过采样箱顶部而不影响玉米生长，大箱在玉米生长到50 cm以后压弯玉米植株。研究表明：在定量夏玉米农田土壤N2O排放时，与不破坏玉米根系正常生长的小箱测定结果相比，因使用大箱并压弯玉米造成玉米生长不良，不会显著影响N2O累积排放量的测定结果。在N2O日排放通量较强时，曲线并直线算法与直线算法得到的结果没有显著差异；而在N2O日排放通量较弱时，曲线并直线算法测定结果高于直线算法。由于N2O排放较弱时的通量对夏玉米季农田N2O累积排放量贡献很小，因此，曲线并直线和直线算法在计算夏玉米季农田N2O累积排放量时并无显著差异。 |
| 英文摘要: |
| Chamber sizes and calculation methods may significantly affect the measurement results for N2O emissions in terrestrial ecosystems when the static chamber method is used. This study compared the N2O emissions of summer maize growing season on the North China Plain under four treatments regarding different chamber sizes and calculation methods, i.e., big chamber+linear model, small chamber+linear model, big chamber+quadratic/linear model, and small chamber+quadratic/linear model. N2O fluxes were measured by the static chamber-gas chromatograph method. When the big chamber(hampering the growth of maize) was compared with the small chamber(no destructive effect on maize growth), the results showed that the use of the big chamber had no significant effect on the total cumulative N2O emissions across the whole maize growth season. The daily N2O flux calculated by the quadratic/linear model was not significantly difference with that by the linear model when the daily N2O flux was high. However, the daily N2O flux calculated by the quadratic/linear model was higher than the flux calculated by the linear model when the daily N2O flux was relatively low. As the N2O emissions within the low N2O flux events only made a small contribution to total cumulative N2O emissions of whole summer maize season, no significant differences were observed in total cumulative N2O emissions between the quadratic/linear model and the linear model. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
|
|
|
