控制灌溉模式对稻田甲烷排放的影响研究.docVIP

 控制灌溉模式对稻田甲烷排放的影响研究# 5 10 15 20 25 30 35 40 45  摘要：为探讨节水灌溉水分调控对稻田甲烷（CH4）排放的影响，寻找节水减排的稻田灌溉模式，依据 5 年田间原位观测资料，分析控制灌溉稻田甲烷排放规律及其减排效果。结果表明，控制灌溉稻田稻季 CH4 排放量为 1.07±0.17g/m2，较常规灌溉稻田(6.49±0.17g/m2)降低 83.5%，差别极显著。中国东南部稻田稻季和 全年 CH4 排放量均低于已有报道中的中国稻田 CH4 排放量，其中控制灌溉稻田全年 CH4 排放量低于世界大 部分地区稻田。控制灌溉模式显著影响水稻全生育期稻田 CH4 排放通量的变化，削峰效果显著。在持续降 雨的作用下，控制灌溉和常规灌溉模式下稻田 CH4 排放通量均呈现下降趋势。控制灌溉模式在水稻全生育 期的应用可显著地减少稻田 CH44 排放。 关键词：稻田；甲烷；控制灌溉；土壤水分调控；降雨 中图分类号：S 274.3 Methane emssions from paddy fields under controlled irrigation He Yupu1,3, Peng Shizhang1, Yang Shihong1,3, Xu Junzeng1,3, Hou Huijing2 (1. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098; 2. College of Water Resources and Architectural Engineering, Northwest Agriculture and Forestry University, Yangling, Shaanxi 712100; 3. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098) Abstract: To explore the influence of soil moisture regulation on methane (CH4) emissions under water-saving irrigation and look for an irrigation mode for rice that would save water while simultaneously limiting CH4 emissions, the regularity of CH4 emissions from paddy fields under controlled irrigation was analyzed based on 5 years’ of field experiment data. The results showed that the total CH4 emissions from paddy fields under controlled irrigation was 1.07±0.17g/m2, which was significantly reduced by 83.5% compared with that under flooding irrigation(6.49±0.17g/m2). Total seasonal and annual CH4 emissions from CI and FI paddy fields in located in Southeast China are lower than the value reported about CH4 emissions from China paddy fields. Meanwhile, the total annual CH4 emissions from controlled irrigation paddy fields is lower than that of paddy filed in most parts in the World. The controlled irrigation mode significantly changed CH4 emissions law from paddy fields and also reduced the emission peak.The CH4 emissions from paddy fields under controlled irrigatio