北京地区春季稻稻田甲烷排放的研究

观测不同农业管理条件下，北京地区春季稻稻田甲烷的排放通量。以当地农民所惯用的管理方式为代表，排放通量为８．７ｍｇ／（Ｍ＾２．ｈ）。甲烷排放有季节性变化，以分蘖期和扬花期为峰值，土壤氧化还原电位的变化与甲烷排放有很好的相关性，施用过量的有机肥会增加排放，采用科学的间歇灌溉方式可以增产并降低甲烷的排放旱直播技术虽可大大降低甲烷和但影响水稻产量，有待进一步的研究。

Study on the Methane Emission from Spring Rice Fields in Beijing

The emission of methane (CH₄) from spring rice fields under different field managements was measured in Beijing in 1991. Under the traditional practice of local agricultural manasement, the CH₄ emission flux was found to have a mean value of 8.7mg/(m²·h). The seasonal variation in CH₄ emission was observed with the Peak values occurred in the tillering and flowering phases. The redox potential in soil was found to be correlated with CH₄ emission. The organic manures applied in field resulted in an increased CH₄ emission. Intermittent irrigation on a scientific basis to have an alternating dry and flooded paddy may be an effective way to increase rice yield and to reduce CH₄ emission. Direct dry-sowing technology may largely out down CH₄ emission but may reduce rice yield that needs to be further studied.