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稻麦轮作系统土壤甲烷和氧化亚氮排放的原位观测研究

发表时间:2017-06-30  浏览量:152  下载量:7
全部作者: 纪程,靳亚果,孔德雷,刘树伟
作者单位: 南京农业大学资源与环境科学学院
摘 要: 采用静态暗箱−气相色谱法原位同步观测稻田CH4和N2O排放,探讨稻田系统中温室气体的排放强度、排放特征、驱动机制和净综合增温潜势(global warming potential,GWP)等。结果表明,稻田CH4和N2O排放的周年变化模式不受氮肥施用量的影响。稻田CH4排放主要集中于水稻生长季,而N2O则大部分在非水稻生长季(休闲期+小麦生长季)排放。化肥施氮量的增加降低了稻田全年的CH4排放,却显著促进N2O排放,但净GWP(100年时间尺度)并没有显著差异。
关 键 词: 大气环境学;稻田;CH4;N2O;综合增温潜势
Title: In-situobservation study of methane and nitrous oxide emissions from paddy fields
Author: JI Cheng, JIN Yaguo, KONG Delei, LIU Shuwei
Organization: College of Resources and Environmental Sciences, Nanjing Agricultural University
Abstract: This study was carried out in the conventional paddy fields (rice-winter wheat rotations), CH4 and N2O fluxes were simultaneously measured by using static opaque chamber-gas chromatograph method. The main objectives of this study were to gain an insight into CH4and N2O emission intensity, emission characteristics, driving mechanism, and their net global warming potential (GWP) in the paddy fields. Results showed that different levels of nitrogen fertilizer cannot alter annual emission patterns of CH4and N2O in the paddy fields. Substantial CH4 emissions from the paddy fields were mainly during the rice growing season, while N2O emissions were mostly during the following non-rice season (including following fallow period and wheat season). Increasing the amounts of nitrogen fertilizer can reduce the annual CH4emission, but remarkably increase the annual N2O emission and their net GWP did not differ significantly over a 100-year horizon.
Key words: atmospheric environmentology; paddy fields; CH4; N2O; global warming potential
发表期数: 2017年6月第12期
引用格式: 纪程,靳亚果,孔德雷,等. 稻麦轮作系统土壤甲烷和氧化亚氮排放的原位观测研究[J]. 中国科技论文在线精品论文,2017,10(12):1360-1368.
 
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