冬季猪舍粪便贮存过程中CO2排放特征

利用丹麦猪舍和液态猪粪便进行了CO2气体排放测试，比较了3种粪坑内粪便高度（0.15，0.40和0.65 m）、3种通风量（211，650和1 852 m3/h）、粪坑内有无挡板下冬季猪舍粪便贮存过程中CO2排放通量。测试结果表明：通风量、粪便温度和粪坑挡板可以用来解释大部分的CO2排放通量变化的差异；对于使用渗透性天花板进气和负压通风排气，CO2排放通量随着舍内通风量的增加而增大，3种通风量之间CO2排放通量差异显著；使用粪坑挡板可以显著降低粪坑内的空气交换和减少CO2排放通量；粪便贮存高度的变化对CO2排放通量的作用不明显；敏感性分析表明CO2排放通量相对于粪便温度的敏感性（敏感度值大）要高于通风量，在较低的通风量变化区间，CO2排放通量变化的敏感性要高于较高的通风量变化区间，但对于粪便温度变化趋势正好相反。通风量的增加同时会降低舍内和粪坑内空气温度以及粪便温度，因此要综合考虑通风量和温度对气体排放通量的影响。

Characteristics of carbon dioxide emission from pig house liquid manure stored in winter

CO2 emissions from liquid pig manure stored in under-floor pits were investigated using an empty full-scale pig house in Denmark in winter time. The experiment designs were of three manure depths of 0.15, 0.40 and 0.65m, three ventilation rates of 211, 650 and 1852 m3/h, and with or without pit curtains. The three parameters that explained most of the variability of the CO2 emissions were ventilation rate, manure temperature, and pit curtain. CO2 emission rate increased as room ventilation rate increased with diffuse ceiling inlet. There were significant differences in CO2 emission rates among three ventilation rates. CO2 emission rate and air exchage rate could be reduced significantly by using manure pit curtains. No significant differences in CO2 emission rates were found among three manure depths. The emission rates were more sensitive to manure temperature than to ventilation rate due to higher sensitivity percentages. At the lower ventilation rate ranges, the emission rates were more sensitive to ventilation rate change compared to the higher ones. However, the contrary sensitivity responses for different manure temperature ranges were obtained. Increasing ventilation rate could reduce the temperature of room and pit air as well as manure temperature, therefore, the effects of ventilation rate and temperature on gas emissions should be considered comprehensively.