Environmental Science Division, National Botanical Research Institute, Rana Pratap Marg, Lucknow, UP, India.
Sci Total Environ. 2010 Feb 1;408(5):1085-90. doi: 10.1016/j.scitotenv.2009.09.010. Epub 2009 Oct 25.
Water drainage is considered to be one of the important practices that reduce the CH(4) efflux from paddy fields. In this study, four different drainage systems (continuous flooding, tillering stage drainage, mid-season drainage and multiple drainage) were compared to find out the best one, for attenuation of CH(4) emission from rice fields. Except for continuous flooding, from all the other three drainage systems, irrigation water from the paddy fields was drained out at the different stages of the crop cycle. Highest efflux of the methane was recorded from continuously flooded plots (346.6 mg/m(2)/day), followed by 9% less CH(4) efflux from tillering stage drainage (315.1mg/m(2)/day), 36.7% less efflux from mid-season drainage (219.3mg/m(2)/day) and the least 41% CH(4) efflux from multiple drainage plots (204.7 mg/m(2)/day). Among all the four different drainage systems applied, mid-season drainage and multiple drainage were found to be highly effective in mitigating methane efflux. Redox potential of the soil of the drainage system was found to be inversely proportional to the methane efflux from all the treatments.
排水被认为是减少稻田 CH(4) 排放的重要措施之一。在这项研究中，比较了四种不同的排水系统（连续淹水、分蘖期排水、中期排水和多次排水），以找出减少稻田 CH(4) 排放的最佳方法。除了连续淹水外，从其他三种排水系统中，在作物周期的不同阶段都将稻田的灌溉水排出。从连续淹水的地块中记录到最高的甲烷通量（346.6mg/m(2)/天），其次是分蘖期排水减少了 9%的 CH(4)通量（315.1mg/m(2)/天），中期排水减少了 36.7%的通量（219.3mg/m(2)/天），多次排水的 CH(4)通量最少，减少了 41%（204.7mg/m(2)/天）。在所应用的四种不同排水系统中，中期排水和多次排水被发现对减少甲烷排放非常有效。排水系统土壤的氧化还原电位与所有处理的甲烷通量成反比。
