黑土稻田CH_4控排的水肥优化盆栽试验

Pot experiment on mitigation of CH_4 emissions from phaeozem paddy field under optimum water and fertilizer managements

以黑土稻田为研究对象，研究CH。控排的最优水肥配施方案，采用静态暗箱一气相色谱法并运用4因子二次饱和D-最优设计方案分析了控制灌溉条件下氮肥、磷肥、钾肥和灌水量对温室气体CH。生长季排放量的影响。结果表明，氮肥的增加可明显降低CH。生长季排放量，钾肥和磷肥作用不明显，灌水量在高水平时会促进CH。生长季的排放。结合产量，筛选出稻田甲烷减排20％-40％的综合水肥优化施配方案为：施氮量114．72kg／hm2，施钾量50．25kg／hm2，施磷量37．51kg／hm2，分蘖末期土壤相对含水率为80％。

To study the optimum water and fertilizer adaptation program on mitigation of CH4 and N2O emissions from phaeozem paddy field, the effects of nitrogen, phosphorus, potassium and irrigation rate on CH4 and N2O e- missions in growing season under controlled irrigation was analyzed by four factor two saturation D - optimum de- sign scheme, using the method of static chamber -gas chromatograph techniques. The results showed that for CH4 emissions in growing season, the increase of nitrogen fertilizer showed inhibitory effects, irrigation in high level performances to promote the CH4 emission, the effects of potash and phosphate were not obvious. Combined with yield, an optimum management plan of water and fertilizer was suggested for CH4 reduction by 20% ~ 40% based on computer simulation, that was 114.72kg/hm2 for N, 50.25kg/hm2 for K20, 37.51kg/hm2 for P205, 80% for relative soil water content in rice tillering sage.