| 地表臭氧浓度升高对旱作农田N2O排放的影响 |
| 摘要点击 2871 全文点击 1549 投稿时间：2014-05-10 修订日期：2014-09-11 |
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| 中文关键词 臭氧 冬小麦 大豆 土壤 N2O排放 |
| 英文关键词 ozone winter wheat soybean soil N2O emission |
| 作者 | 单位 | E-mail | | 吴杨周 | 南京信息工程大学气象灾害预报预警与评估协同创新中心, 南京 210044
南京信息工程大学应用气象学院, 南京 210044 | yangzhou_wu@139.com | | 胡正华 | 南京信息工程大学气象灾害预报预警与评估协同创新中心, 南京 210044
南京信息工程大学江苏省农业气象重点实验室, 大气环境中心, 南京 210044
南京信息工程大学应用气象学院, 南京 210044 | zhhu@nuist.edu.cn | | 李岑子 | 南京信息工程大学应用气象学院, 南京 210044 | | | 陈书涛 | 南京信息工程大学气象灾害预报预警与评估协同创新中心, 南京 210044
南京信息工程大学应用气象学院, 南京 210044 | | | 谢燕 | 南京信息工程大学应用气象学院, 南京 210044 | | | 肖启涛 | 南京信息工程大学江苏省农业气象重点实验室, 大气环境中心, 南京 210044
南京信息工程大学应用气象学院, 南京 210044 | |
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| 中文摘要 |
| 通过田间试验,在冬小麦和大豆生长季设置3种不同臭氧(O3)浓度的处理,包括自由空气(对照,CK)、100 nL·L-1 O3浓度(T1)和150 nL·L-1 O3浓度(T2),采用静态箱-气相色谱法测定N2O排放通量,研究地表O3浓度升高对冬小麦-大豆轮作系统N2O排放的影响. 结果表明,与CK相比,在冬小麦返青期,T1和T2处理都降低了土壤-冬小麦系统N2O累积排放量,降幅分别为37.8%(P=0.000)和8.8%(P=0.903); 在拔节-孕穗期,T1和T2处理使N2O累积排放量分别降低了15.0%(P=0.217)和39.1%(P=0.000); 从冬小麦全生育期来看,T1、T2的N2O累积排放量分别降低了18.9%(P=0.138)和25.6%(P=0.000). 由于本年度大豆生长季降水偏少,受干旱胁迫的影响,O3浓度升高对大豆田N2O排放的作用不明显. 本研究表明地表O3浓度升高会减少旱作农田N2O排放量. |
| 英文摘要 |
| To investigate the impact of elevated surface ozone (O3) concentration on nitrous oxide (N2O) emission from arid farmland, field experiments were carried out during winter-wheat and soybean growing seasons under the condition of simulating O3 concentrations, including free air (CK), 100 nL·L-1 O3 concentration (T1), and 150 nL·L-1 O3 concentration (T2). N2O emission fluxes were measured by static dark chamber-gas chromatograph method. The results showed that the accumulative amount of N2O (AAN) were decreased by 37.8% (P=0.000) and 8.8% (P=0.903) under T1 and T2 treatments, respectively, in the turning-green stage of winter wheat. In the elongation-booting stage, ANN were decreased by 15.0% (P=0.217) and 39.1% (P=0.000) under T1 and T2 treatments, respectively. ANN were decreased by 18.9% (P=0.138) and 25.6% (P=0.000) under T1 and T2 treatments, respectively, during the whole winter-wheat growing season. No significant impact of elevated O3 concentration on N2O emission from soil-soybean system was found due to the less rainfall during the soybean growing season, drought had a stronger stress on soybean than O3 concentration. The results of this study suggested that elevated O3 concentration could reduce N2O emission from arid farmland. |
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