稻-鸭复合生态系统产甲烷细菌数量

采用厌氧培养箱技术 ,用最大或然数计数法 (MPN法 )和滚管法同时测定稻 -鸭复合系统和常规稻作系统早稻不同生育期土壤中的产甲烷细菌数量。结果表明 :(1)两系统产甲烷菌数量具有明显的季节变化规律。水稻返青期前 ,两系统的产甲烷菌数量相差不大 ,随着水稻生育期的推进 ,两处理的产甲烷菌数量逐渐增加 ,均在分蘖盛期明显增高 ,孕穗期达到最高 ,乳熟期又显著减少 ,生长后期又有所回升。(2 )稻田围栏养鸭能减少稻田中的产甲烷菌数量 ,特别是减少了稻田甲烷排放高峰期的产甲烷菌数量。在水稻分蘖盛期和孕穗期 ,MPN计数法中 ,稻 -鸭复合生态系统低于常规稻作系统 2 0 .0 %～ 96 .9% ;滚管法计数中 ,前者比后者降低 33.3%～ 98.1% ,两系统的产甲烷菌数量之间的差异均达极显著水平。 (3)产甲烷细菌对甲醇、异丙醇、CO2 / H2 、乙酸钠有嗜好表现 ,对甲胺、甲酸、甲胺 甲醇 甲酸 异丙醇 乙酸钠 (混合基质 1)、甲酸 甲醇 异丙醇 乙酸钠 (混合基质2 )、甲醇 异丙醇 乙酸钠 (混合基质 3)有不适应的表现

Studies on amount of methanogens in the rice-duck agroecosystem

The study was focused on the relationship between the intensify rice-duck planting and its effects on the amount of methane emission from the paddy field. During the study,the author took a careful study and appraisal of the basis of rice-duck complex planting and breeding pattern,and how it could evidently decrease the total amount of methane emission present on the paddy field.The study also covers the amount of methanagens present and the influence of the substrates on it in the rice-duck complex ecosyst...