【摘要】 采用静态箱法研究了控释肥料和常规肥料处理对赤红壤稻田CH4排放的影响.结果表明①在水稻生长期间,相比对照(CK),不同肥料处理均促进了稻田CH4日排放,其影响顺序为Crf≥Scotts>Urea≥Com>CK;②在移栽后75d和90d时,各处理的水稻地上部干物质积累量与其CH4日排放通量间相关系数分别为0.8298和0.6539,均达极显著水平;③在水稻生殖生长期,各处理CH4阶段累积排放量占全生育期的32.60%~40.08%,其日排放通量在全生育期中居最高值,控制稻田CH4排放的最适时期应是水稻幼穗分化期;④相比复合肥,控释肥一次施用和尿素分次施用均显著地降低了全球增温潜势.图2表2参19更多还原

【Abstract】 Study on the effect of four kinds of fertilizers on CH_ 4 emission from paddy field was carried out in lateritic paddy soil by using close chamber method. The fertilizers included pilot scale product of controlled release fertilizer (Crf), commercial product of Scotts product, non-coated compound fertilizer (Com) being kernel fertilizer of the two Crfs and normal urea. The results showed that amount of daily methane emission (ADME) from paddy soil was enhanced by the treatments with fertilizers during rice growth compared to CK, in order of Crf≥Scotts>Urea≥Com>CK. There was a very significant correlation between cumulative dry biomass above ground and ADME on 75 d and 90 d after transplanting. The correlation coefficient was 0.829 8 and 0.653 9, respectively. The ADME was the highest at the seminal phase for every treatment during rice growth. Accumulative emission of the phase was 32.60%～40.08% of the whole developing period. Therefore, the young spike developing period was the optimal period to control methane emission from paddy soil. Global warming potential from the paddy field was reduced significantly in both one-time basal application of Crfs and three-times splitting application of urea compared with compound fertilizer. Fig 2, Tab 2, Ref 19更多还原