不同有机肥与化肥配施对菜地CO_2和CH_4排放的影响

Effects of Different Combinations of Organic Fertilizer and Inorganic Fertilizer on Emission of CO_2 and CH_4 in Vegetable Field

采用田间小区试验研究了不同有机肥与化肥配施对小白菜地土壤CO2和CH4排放通量的影响。结果表明,有机肥的施用会增加CO2和CH4的排放量,各有机无机肥配施处理的CO2平均排放通量均显著高于CK(不施肥)、T1(不施氮肥)、T2(施纯化肥)处理;而猪粪堆肥与化肥配施较猪粪直接与化肥配施能降低小白菜地土壤的CO2和CH4的排放量;此外,有机无机肥配施条件下,菜地土壤CO2排放通量与地下5 cm、10 cm处的土壤温度呈正相关关系;而土壤CH4的排放通量虽然受土壤温度、箱外气温和土壤含水量的影响,但并无明显的线性相关关系。

The effects of combined application of organic fertilizer and inorganic fertilizer on emission flux of CO2 and CH4 in vegetable field were studied through field plot test.The results showed that the application of organic fertilizer can promote the emission of CO2 and CH4,the average CO2 emissions in each treatment with combined application of organic fertilizer and inorganic fertilizer were significantly higher than that in CK(non fertilization),T1(no nitrogen application) and T2(application of pure inorganic fertilizer);in comparison with directly combined application of pig manure and inorganic fertilizer,the treatment with combined application of composted pig manure and inorganic fertilizer can reduce emission of CO2 and CH4 in vegetable field;moreover,with combined application of organic fertilizer and inorganic fertilizer,the emission flux of CO2 in soil of vegetable field showed a positive correlation with soil temperature at 5 cm and 10 cm of soil layer underground;emission flux of CH4 in soil was influenced by soil temperature,air temperature outside box and soil water content,but there were non significant linear relationship between them.