栽培方式对福州平原稻田氧化亚氮减排的研究

Study on alternative cultivation patterns on nitrous oxide reduction in paddy fields of Fuzhou Plain

采用静态箱-气相色谱法对手插、抛秧、机插和直播的稻田氧化亚氮通量季节变化进行了测定与分析。研究结果表明：观测期内，手插、抛秧、机插和直播样地氧化亚氮季节变化通量分别为-55．67～63．73、-53．03～70．31、-47．41～84．29、-27．38～85．10μg/（m2· h ），平均值分别为7．71、20．98、11．24、37.78μg/（m2· h）。pH和Eh对手插样地氧化亚氮通量具有显著的影响，其他处理样地则是受到多因子的综合作用。从水稻千粒质量看，4种栽培方式由小到大的排序为机插、手插、直播、抛秧，从单丛产量看，4种栽培方式由小到大的排序为手插、抛秧、机插、直播。

In order to clarify the effect of alternative cultivation patterns on paddy field nitrous oxide fluxes ,seasonal nitrous oxide variation of hand transplanting ,seedlings throwing ,machine transplanting and direct seeding is determined by static chamber-gas chromatogram .The results show that the seasonal variations of nitrous oxide fluxes are -55 .67~63 .73 ,-53 .03~70 .31 ,-47 .41~84 .29 and -27 .38~85 .10μg/（m2 · h） ,and the averaged values were 7 .71 ,20 .98 , 11 .24 and 37 .78μg/（m2 · h） ,respectively .Nitrous oxide values are followed the order of hand transplanting ＆lt; machine transplanting ＆lt; seedlings throwing ＆lt;direct seeding .The pH and Eh are the most important influencing factors for hand transplanting plot and the others are influenced by the multi-factors actions .Seen from the grain ,the four different cultivation patterns are machine transplanting ＆lt; hand transplanting ＆lt; direct seeding ＆lt; seedlings throwing and seen from single bundle yield ,the four different cultivation patterns are hand transplanting ＆lt; seedlings throwing ＆lt; machine transplanting ＆lt; direct seeding .