中国生态农业学报2017，Vol.25Issue(7)：958-967,10.DOI:10.13930/j.cnki.cjea.160921
水肥管理对稻田CH4排放及其全球增温潜势影响的评估
Impact of water/fertilizer management on methane emission in paddy fields and on global warming potential
摘要
Abstract
Methane (CH4) is a key greenhouse gas, second only to CO2 in term of contribution to global warming. Paddy field, as an important source of CH4 emission, has significant implications for global warming and climate change. In order to un-derstand the main factors of CH4 emission in paddy fields and its impact on global warming, this study calculated potential global warming and sought measures to mitigate CH4 emission in paddy fields. To do so, we collected data on CH4 emission in paddy fields in China using literatures published before 2015 (including journals and doctoral and master dissertations) and documented in CNKI net, ScienceDirect and SpringLink. Then daily CH4emission, global warming potential (GWP) and as-sociated factors influencing CH4 emission in paddy fields in China were analyzed using regression and factorial analyses. The results showed that daily emission of CH4in paddy field and GWP due to CH4 emission increased with increasing soil organic matter (SOM). The order of daily CH4 emission from paddy field was: late paddy field of double cropping rice > early paddy field of double cropping rice > single cropping paddy field > late paddy field of rice-wheat rotation. GWP due to CH4 emission in late paddy field was more than that in early paddy field for double cropping rice. The order of daily CH4 emission from paddy fields with different fertilizer managements was: ST (straw turnover) > NO (chemical nitrogen fertilizer with organic manure) > NF (chemical nitrogen fertilizer)≈ BI (biochar). Water management significantly affected CH4 emission from paddy fields with the order of continuous flooding (CF) > field drying (FDF) > flooding-drying alternation (FD) > control irrigation (CI). Proper water management also significantly reduced GWP due to CH4 emission. The order of GWP due to CH4 emission in early paddy fields, late paddy fields and single cropping rice paddy fields was also as follows: CF > FDF > FD > CI. The results suggested that CH4 emission was influenced by many factors, including soil SOM content, water and fertilizer man-agement, and basic soil conditions. However, agricultural management activities (e.g., water and fertilizer management, fertil-izer amount, fertilizer type) played a major role in CH4 emission in agricultural lands. This was influenced by soil nutrient conditions (soil SOM content and C:N ratio), climatic conditions (crop growth period, temperature and precipitation during growth period), management practices (fertilizer and water management), rotation system, and other factors. For a more accu-rate inventory of greenhouse gas emission and proposal of effective mitigation policies, it was critical to use appropriate prac-tices suitable to specific climatic, soil and cropping conditions, combined with rational nitrogen fertilizer application rate and water management.关键词
稻田/温室气体/甲烷排放/增温潜势/土壤有机质/水肥管理/栽培制度Key words
Paddy field/Greenhouse gases/Methane (CH4) emission/Global warming potential/Soil organic matter/Water and fertilizer management/Cropping system分类
农业科技引用本文复制引用
谢立勇,许婧,郭李萍,徐玉秀,孙雪,赵洪亮,郭飞,赵迅..水肥管理对稻田CH4排放及其全球增温潜势影响的评估[J].中国生态农业学报,2017,25(7):958-967,10.基金项目
国家科技支撑计划"十二五"项目(2013BAD11B03)资助 This study was founded by the National Key Technology Research & Development Program of China (2013BAD11B03). （2013BAD11B03）
