| 控制灌溉稻田CH_4排放的影响因子分析 |
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| 引用本文： | 侯会静,杨士红,徐俊增.控制灌溉稻田CH_4排放的影响因子分析[J].节水灌溉,2016(8):70-75. |
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| 作者姓名： | 侯会静 杨士红 徐俊增 |
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| 作者单位： | 1. 西北农林科技大学水利与建筑工程学院,陕西 杨凌,712100;2. 河海大学水利水电学院,南京,210098 |
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| 基金项目： | 国家自然科学基金项目(51309192)，中央高校基本科研业务专项基金项目(Z109021510)。 |
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| 摘 要： | 为了揭示水稻控制灌溉对稻田CH4排放的影响机理,本文采用静态暗箱-气相色谱法对控制灌溉稻田CH4排放进行原位观测,同时观测土壤水分、表层土温和氧化还原电位(Eh)等影响因子,定量分析控制灌溉稻田CH4排放通量与影响因子间的关系。结果表明,控制灌溉稻田田表水层消失后的微弱脱水状态导致了CH4短暂的剧烈释放,CH4排放的峰值大多出现在土壤接近饱和状态(土壤充水孔隙率为99.0%~99.8%)时;控制灌溉稻田CH4排放通量与表层5cm土温之间无显著相关关系(p0.05);CH4的剧烈释放必须在土壤Eh下降到-100~-150mV,控制灌溉稻田不适宜CH4的产生;控制灌溉稻田CH4集中排放阶段(水稻移栽后21d内)的通量值与土壤Eh值呈极显著负指数相关关系(p0.001)。不同灌溉模式调控下的土壤水分状况是导致稻田CH4排放显著差异的主要因素。
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| 关 键 词： | 灌溉 排放 CH4 稻田 影响因子 |
Influence Mechanism of Controlled Irrigation on CH4 Emissions From Paddy Fields |
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| Abstract: | In order to study the effects of controlled irrigation (CI)on seasonal variations of CH4 emissions from paddy fields,CH4 e-missions from CI paddy fields were investigated by the method of static chamber/gas chromatography.Soil moisture,soil tempera-ture and soil redox potential (Eh)were also measured.The quantitative relationships between CH4 emissions and affecting factors were analysed.The weak soil drying led to a short sharp release of CH4 emissions from CI paddy fields.The peaks of CH4 emissions from the CI paddy fields were observed at the WFPS ranging from 99.0% to 99.8%.No significant correlation was found between soil temperature and CH4 emissions (P>0.05).The high emissions of CH4 were observed at soil Eh ranging from -100 to -150 mV,and the conditions of soil Eh in CI paddy fields were not suitable for the production of CH4 .A significantly negative exponential relationship (p<0.001)was observed between soil Eh values and high CH4 emissions observed within 21 days after rice transplan-ting in CI paddy fields.The soil water status under different irrigation modes of rice is the main factor that lead to a significant differ-ence between CH4 emissions. |
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| Keywords: | irrigation emission CH4 paddy fields impact factor |
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