摘要
为了精确估算稻田温室气体排放量以及为制定合理的减排措施提供数据,在江苏省苏州市进行了5年田间定位试验,设计水稻-休闲(T_1)、水稻-黑麦草(T_2)、水稻-紫云英(T_3)、水稻-小麦(T_4)和水稻-油菜(T_5)等5种种植制度,采用静态箱-气相色谱法研究了不同种植制度下稻田温室气体甲烷(CH_4)和氧化亚氮(N_2O)排放及其温室效应。结果表明:不同种植制度对稻季、非稻季以及周年的CH_4和N_2O排放以及总增温潜势均有极显著影响;周年CH_4总排放量表现为T_3(294.97 kg/hm^2)>T_1(151.04 kg/hm^2)>T_5(123.89 kg/hm^2)>T_4(119.33 kg/hm^2)>T_2(111.92 kg/hm^2);周年N_2O排放总量表现为T_5(3.26 kg/hm^2)>T_4(2.56 kg/hm^2)>T_2(2.33 kg/hm^2)>T_3(2.26kg/hm^2)>T_1(1.42 kg/hm^2);不同种植制度处理周年排放的CH_4和N_2O所产生的总增温潜势以T_3(8 857 kg/hm^2)为最高,显著高于其他处理。可见,采用水稻-紫云英种植制度会明显增加长江下游稻田甲烷排放和温室效应。
A five-year field experiment was carried out in Suzhou, Jiangsu province to draw on the benefits of scientific evaluation of emissions of greenhouse gases (GHGs) and provide scientific instructions to develop rational measures for reducing GHGs emission from rice fields in the lower reaches of Yangtze River.By using static chamber/gas chromatographic techniques, this experiment was simultaneously measured for CH4 and N2O emissions under five rice-based cropping patterns: rice-fallow (T1), rice-ryegrass (T2), rice-Chinese milk vetch (T3), rice-wheat (T4), and rice-rape (T5).The results showed that the total CH4 and N2O emissions and global warming potentials (GWPs) in rice growing season, non-rice growing season and whole annual cycle were significantly influenced by cropping patterns.Annual total CH4 emissions under different cropping patterns were: T3(294.97 kg/hm2)> T1(151.04 kg/hm2)> T5(123.89 kg/hm2)> T4(119.33 kg/hm2)> T2(111.92 kg/hm2).Annual total N2O emissions under different cropping patterns followed the order of T5 (3.26 kg/hm2) > T4 (2.56 kg/hm2) > T2 (2.33 kg/hm2) > T3 (2.26 kg/hm2) > T1 (1.42 kg/hm2).Annual GWPs of CH4 and N2O were significantly higher in T3 (8 857 kg/hm2) than those in T1, T5, T4 and T2.These results indicate that rice-ryegrass could increase CH4 emissions and intensify the greenhose effects in rice fields in the lower reaches of Yangtze River.
出处
《江苏农业学报》
CSCD
北大核心
2017年第2期-,共6页
Jiangsu Journal of Agricultural Sciences
基金
国家科技支撑计划项目(2012BAD14B12)
公益性行业(农业)科研专项经费项目(201503122)
关键词
种植制度
稻田
温室气体
排放
cropping pattern
paddy field
greenhouse gas
emission
