Effects of water regimes on nitrous oxide emission from soils
Effects of water regimes on nitrous oxide emission from soils
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水情对土壤一氧化二氮排放的影响
DOI：
10.1016/j.ecoleng.2007.04.001
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发表时间：
2007-09-03
影响因子：
3.8
通讯作者：
Lu, Jun
中科院分区：
文献类型：
--
作者：
Huang, Shuhui;Pant, Hari K.;Lu, Jun
水分状况是影响土壤N2O排放的关键因素之一。为了解灌溉对中国东南部水稻土N2O排放的影响，采用土柱试验方法，研究了淹水、间歇和自然干旱3种灌溉方式对水稻土N2O排放的影响。自然干燥对N2O排放的贡献最大。土壤开裂刺激更大的N2O排放量，而洪水灌溉制度的贡献最小。N2O排放量与表层水中溶解态N20浓度呈极显著正相关。在漫灌条件下，地表水溶解态N20（Ds1）、渗滤液溶解态N20（D1）和pH值（pH1）可以解释N20排放量（F1）80%的变异性，如F1 = 0.22ODS1 - 0.12D1 - 21.75pHl1 + 157.64; R-2 = 0.804，p = 0.032。间歇灌溉条件下，pH值与渗滤液中溶解性N_2O呈显著正相关。这表明，在种植水稻时，不应尽可能多地进行自然干燥，以避免大量N2O排放到大气中。然而，未来的研究应调查其他温室气体的潜在排放，以推荐特定的灌溉制度。
Water regime is one of the key factors affecting nitrous oxide (N2O) emissions from soils. To gain insights into how irrigation activities on paddy soils in southeastern China affect the dynamic process of N2O emissions, soil column experiments were conducted with three irrigation regimes, namely, flooding, intermittent and natural drying. Natural drying had the most contribution to N2O emissions. Soil cracking stimulated the greater emissions of N2O whereas flooding irrigation regime had the least contribution. There was a highly significant positive correlation between the N2O emissions and the concentrations of dissolved N20 in surficial water. Under flooding irrigation regime, 80% of the variability in the N20 emissions (F1) could be explained by dissolved N20 in surface water (Ds1), dissolved N20 in leachate (D1) and pH (pH1) as shown here: F1=0.22ODs1-0.12D1-21.75pHl1+157.64; R-2 =0.804, p = 0.032. Moreover, pH had a significant correlation with dissolved N2O in leachates under intermittent irrigation regime. It is indicative that natural drying should not be practiced as much as possible while cultivating rice in order to avoid massive N2O emissions into the atmosphere. However, future studies should investigate potential emission of other greenhouse gases to recommend a particular irrigation regime.