| 不同灌溉模式和施氮处理下稻田氨氧化细菌及无机氮对N2O排放的影响 |
| |
| 引用本文： | 刘靖雯,李伏生,董艳芳,王楷,方泽涛,黄忠华,罗维钢.不同灌溉模式和施氮处理下稻田氨氧化细菌及无机氮对N2O排放的影响[J].华中农业大学学报,2017,36(4):7-14. |
| |
| 作者姓名： | 刘靖雯 李伏生 董艳芳 王楷 方泽涛 黄忠华 罗维钢 |
| |
| 作者单位： | 1. 广西大学农学院,南宁 530005;广西喀斯特地区节水农业新技术院士工作站,南宁 530005;广西高校作物栽培学与耕作学重点实验室,南宁530005;2. 南宁市灌溉试验站,南宁,530001 |
| |
| 基金项目： | 基金项目： 国家自然科学基金项目（51469003） |
| |
| 摘 要： | 通过大田试验,研究不同灌溉方式和施氮处理下早稻、晚稻不同时期稻田N_2O的排放通量、氨氧化细菌数量、氨氧化潜势和无机氮含量的变化,揭示土壤氨氧化细菌数量、氨氧化潜势和无机氮含量对稻田N_2O排放的影响。两季试验均设3种灌溉模式,即常规灌溉(CIR)、"薄浅湿晒"(TIR)和干湿交替(DIR),和2种施氮处理,即100%尿素-N(FM1)和50%尿素-N+50%猪粪-N(FM2)。结果表明:晚稻、早稻分蘖期和成熟期土壤氨氧化细菌数量较低,而孕穗期和乳熟期数量较高;晚稻孕穗期、早稻孕穗期和乳熟期土壤氨氧化潜势较高,而晚稻、早稻分蘖期和成熟期土壤氨氧化潜势较低;相同施氮处理下,DIR模式土壤NH_4~+-N含量高于CIR与TIR模式,DIR与TIR模式土壤NO_3~--N含量均显著高于CIR模式;晚稻、早稻孕穗期和乳熟期DIR和TIR模式土壤N_2O排放通量比CIR模式显著提高,FM2处理高于FM1处理;氨氧化细菌和氨氧化潜势与NH_4~+-N含量之间呈极显著正相关关系,N_2O排放通量与氨氧化细菌和氨氧化潜势之间呈极显著正相关关系。因此,N_2O的排放受到氨氧化细菌和氨氧化潜势的直接影响,稻田NH_4~+-N含量大小会影响氨氧化细菌数量和氨氧化潜势,从而间接影响N_2O的排放。
|
| 关 键 词： | 氨氧化细菌 N2O排放 "薄浅湿晒"灌溉 干湿交替灌溉 |
| 收稿时间： | 2016/12/20 0:00:00 |
Effects of ammoniaoxidizing bacteria and inorganic nitrogen on N2O emission from paddy soil under different irrigation modes and nitrogen treatments |
| |
| Abstract: | Two-season experiments with three irrigation modes including conventional irrigation (CIR),"thin-shallow-wet-dry" irrigation (TIR) and alternate wetting and drying irrigation (DIR),and two N treatments including 100% urea-N (FM1) and 50% urea-N +50% pig manure N (FM2)were conducted.The changes of N2O emission flux,the number of ammonia-oxidizing bacteria,potential nitrification rate and inorganic nitrogen content in paddy soil at different growth stages of early rice and late rice were investigated under different irrigation modes and nitrogen (N) treatments to study the effects of ammonia-oxidizing bacteria,potential nitrification rate and inorganic nitrogen content on soil N2O emission.Results showed that the number of ammonia oxidizing bacteria in paddy soil was lower at the stages of tillering and maturing of early rice and late rice,but higher at the stages of booting and milky.Soil potential nitrification rate was higher at the stages of booting of late rice and the stages of booting and milky of early rice,but lower at the stages of tillering and maturing of early rice and late rice.Under the same N treatment,soil NH4+-N content in DIR mode was higher than that in the CIR and TIR modes.Soil NO3--N content in the DIR and TIR modes was significantly higher than that in CIR mode.Soil N2O emission flux at the stages of booting and milky of early rice in the DIR and TIR modes was significantly higher than that in CIR mode.N2O emission flux under FM2 treatment was higher than that under FM1 treatment.The number of ammonia-oxidizing bacteria and potential nitrification rate was significantly positively correlated with soil NH4+-N content.Soil N2O emission flux was significantly positively correlated with the number of ammonia-oxidizing bacteria and potential nitrification rate.Paddy soil N2O emission was mainly affected by ammonia-oxidizing bacteria and potential nitrification rate.It is indicated that soil NH4+-N content directly affects the number of ammonia-oxidizing bacteria and potential nitrification rate,and affects the N2O emission indirectly. |
| |
| Keywords: | ammonia-oxidizing bacteria N2O emission "thin-shallow-wet-dry" irrigation alternate wetting and drying irrigation |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《华中农业大学学报》浏览原始摘要信息 |
| 点击此处可从《华中农业大学学报》下载免费的PDF全文 |
|
