不同农业管理方式对北京地区稻田甲烷排放的影响研究

Study on the Effects of Different Cultivation Methods on the CH4 Emission from Rice Fields in Beijing

1990年7月4日到9月28日,对北京朝阳区洼里乡的麦茬稻田甲烷排放进行了测定研究,取得了不同农业管理条件下的一些初步结果。其中按农民常规管理方式的麦茬稻田甲烷平均排放通量为17.5mg/(m^2·h)。该值可代表北京地区一般麦茬稻田甲烷排放水平。实验表明,水稻田甲烷排放受到灌溉方式、施肥类型及用量、气温等多种因子的影响,其中农业管理措施的影响是显著的。在农民传统施肥方式下,采用间歇灌溉的方式,比传统的淹灌能有效地提高水稻产量并减少稻田甲烷的排放。

From July 4 to Sept. 28, 1990, the CH4 emission from paddy fields of rice after wheat in Beijing area and the effects of different field managements on CH4 emission were studied. Under the local traditional agriculture managements, the mean value of CH4 emission flux was 17 .5 mg/(m2.h), which could be representative for rice field from which wheat has been reaped in Beijing area. Experiments showed that CH4 emissions were obviously affected by irrigation, temperature and the mode of fertilizing. Under the conditions of local traditional fertilizing, Scientific irrigation with fields flooded and moistured alternatively may be an effective way to increase rice production and also to reduce CH4 emission.