Greenhouse Gases Emissions and Nutrient Changes During Aerobic Composting With Different Manure Sources
Five different kinds of livestock and poultry manure (cow manure,sheep manure,pig manure,chicken manure,deer manure)and corn straw were used as experimental materials,and the aerobic composting method was used to study the effects of aerobic composting from different manure sources on compost temperature,pH,conductivity (EC),cellulose,organic carbon (TOC),total nitrogen (TN),greenhouse gases (CH4 ,CO2 ,N2O)and other indicators,in order to provide reference for the efficient utilization of agricultural waste resources and the reduction of agricultural greenhouse gas emissions.The results showed that treatment C (pig manure+straw)and treatment D (chicken manure+straw)heated up faster in the early stage of composting,while treatment B (sheep manure+straw)had a longer duration of high temperature than other treatments.Except for treatment E (deer manure+straw),the pH of the other four treatments was less than 8.5.The EC value of treatment E (deer manure+straw)was the smallest and had the smallest change,with an increase rate of only 27.36％.The highest degradation rate of cellulose in treatment D (chicken manure+straw)was 47.07％.The TOC degradation rate of treatment D (chicken manure+straw)was the highest,at 21.64％.The TN of treatment B (sheep manure+ straw)increased by 103.30％.In terms of greenhouse gases emissions reduction,the lowest emission rates of CH4 ,CO2 ,and N2O were all from treatment B (sheep manure+straw),while the lowest cumulative CH4 emissions were from treatment E (deer manure+straw),and the lowest cumulative CO2 and N2O emissions were from treatment A (cow manure+straw).In conclusion,treatment B (sheep manure+straw)and treatment D (chicken manure+straw ) had better effects in promoting nutrient transformation.The greenhouse gases emission characteristics vary among different manure sources,and treatment B (sheep manure+straw) had a better effect in reducing greenhouse gases emissions.
livestock and poultry manureaerobic compostingnutrient changesgreenhouse gases
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