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首页> 外文期刊>Agricultural Water Management >Effect of organizational paddy water management by a water user group on methane and nitrous oxide emissions and rice yield in the Red River Delta, Vietnam
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Effect of organizational paddy water management by a water user group on methane and nitrous oxide emissions and rice yield in the Red River Delta, Vietnam

机译：水上稻草水管理对越南红河三角洲甲烷和氧化亚氮排放及水稻产量的影响

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摘要

To mitigate the emissions of greenhouse gases from paddy fields and solve water shortage problems, sustainable and eco-friendly water management systems for rice cultivation urgently need to be constructed. Alternate wetting and drying (AWD) water management is effective and saves water. However, practical examples of AWD at the district or on-farm level are limited. We aimed to investigate the feasibility of AWD in experimental block units (conventional, weak-dry, and strong-dry) in paddy fields of about 44 ha in the Red River Delta area of Vietnam by examining the effects of intermittent irrigation (i.e., AWD) on the ponding depth, CH4 and N2O emissions, and rice yield in blocked experimental plots. Intermittent irrigation was expected to be achieved through the operation of irrigation pumps and sluice gates of water division works by the water management organization (water user group) of the district. However, the ponding depth was not controlled as initially planned because of frequent rainfall and low rate of decrease of the ponding depth in the study area. It was, however, confirmed that the period during which the ponding depth decreased below the soil surface was mostly (but not always) longer in the dry-type blocks. CH4 emissions decreased with an increase in drying period and this reduction was large in the summer-autumn season. There appeared to be no relationship between N2O emissions and water management. Rice yield decreased due to extreme drying in the summer-autumn season but was not affected by drying in the winter-spring season. This study demonstrated that CH4 emissions can be reduced and rice yield can be maintained by achieving a maximum drying index (i.e., ratio of the period during which the ponding depth is below the soil surface) of 0.6 in the summer-autumn season in the paddy fields of the target area.
机译：为了减轻稻田的温室气体排放，并解决水资源短缺问题，迫切需要建造水稻种植的可持续和环保水管理系统。交替的润湿和干燥（AWD）水管理是有效的并节省水。但是，地区或农场级别的AWD的实际例子是有限的。我们旨在通过检查间歇性灌溉的影响（即AWD ）在封闭深度，CH4和N2O排放和封闭的实验图中的水稻产量。预计通过该地区的水管理组织（水用户集团）的水分划分工作的灌溉泵和水闸闸门的运作，预计会采取间歇灌溉。然而，由于研究区内频繁的降雨和降雨量的降雨量频繁降雨量和降低速度低，因此不控制池塘深度。然而，确认在干燥型块中，在土壤表面下降以下的涂布深度降低的时期主要是（但并不总是）。 CH4排放随着干燥期的增加而下降，夏季秋季的这种减少很大。 N2O排放和水管理之间似乎没有任何关系。由于夏季秋季极端干燥，稻米产量下降，但在冬季春季干燥不受干燥的影响。本研究表明，通过在稻秋季在稻田中的夏季秋季实现最大干燥指数（即，池塘表面低于土壤表面）的最大干燥指数（即，沉积深度低于土壤表面的时间的比例），可以减少CH4排放量。目标区域的字段。

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