Fu Zhi-qiang, Huang Huang, Xie Wei, He Bao-liang
College of Agronomy, Hunan Agricultural University, Changsha 410128, China.
Ying Yong Sheng Tai Xue Bao. 2009 Dec;20(12):3003-8.
A field experiment was conducted to observe the effects of high-yielding rice cultivars (early rice Luliangyou No. 996 and Chuanfeng No. 1, and late rice T you No. 259) and cultivation patterns (direct sowing and transplanting) on the methane emission from paddy field. The methane emission from early rice field before drying was 52%-73% of the total, while drainage and drying decreased the methane emission significantly. For late rice field, the methane emission during vegetative growth stage was 70% of the total. Under direct sowing of early rice, the average methane flux was lower, but the total methane emission was higher, compared with those under transplanting. As for late rice, both the average methane flux and the total methane emission were higher under direct sowing than under transplanting. There existed significant differences in the methane emission per unit grain production of early rice and late rice between direct sowing and transplanting. The methane emission per unit grain production under direct sowing of early rice super hybrid was increased by 4.84 g CH4 x kg(-1), compared with that under transplanting, and the emission under direct sowing of conventional early rice was increased by 3.48 g CH4 x kg(-1), compared with that under transplanting. The emission under direct sowing of hybrid rice was 6.67 g CH4 x kg(-1) higher than that under transplanting. In the same cultivation area and the same time period of direct sowing and transplanting, the methane emission was in the order of direct sowing of conventional early rice > transplanting of conventional early rice > direct sowing of early rice super hybrid > transplanting of early rice super hybrid, and direct sowing of late rice > transplanting of late rice.
进行了一项田间试验，以观察高产水稻品种（早稻陆两优996和川丰1号，晚稻T优259）和栽培模式（直播和移栽）对稻田甲烷排放的影响。早稻田在排水晒田前的甲烷排放量占总量的52%-73%，而排水晒田显著降低了甲烷排放。对于晚稻田，营养生长阶段的甲烷排放量占总量的70%。早稻直播时，平均甲烷通量较低，但总甲烷排放量较高，与移栽相比。至于晚稻，直播时的平均甲烷通量和总甲烷排放量均高于移栽。早稻和晚稻单位粮食产量的甲烷排放在直播和移栽之间存在显著差异。早稻超级杂交种直播时单位粮食产量的甲烷排放量比移栽时增加了4.84 g CH4·kg(-1)，常规早稻直播时的排放量比移栽时增加了3.48 g CH4·kg(-1)。杂交晚稻直播时的排放量比移栽时高6.67 g CH4·kg(-1)。在相同栽培面积和相同直播与移栽时间段内，甲烷排放量顺序为：常规早稻直播＞常规早稻移栽＞早稻超级杂交种直播＞早稻超级杂交种移栽，晚稻直播＞晚稻移栽。
