不同CN比堆肥碳素物质变化规律研究秦莉.pdf

农业环境科学学报 2010,29(7):1388-1393 Journal of Agro-Environment Science 不同C N 比堆肥碳素物质变化规律研究 1 2 2 2 秦 莉 ，沈玉君 ，李国学 ，胡 菊 （1．农业部环境保护科研监测所，天津 300191 ；2． 中国农业大学资源与环境学院，北京 100193） 摘 要：针对堆肥化过程中常伴有少量CH4 等温室气体排放造成环境污染等问题，采用密闭堆肥化装置，进行了不同碳氮比和通 气条件下，堆肥过程中的气体释放规律、影响因子及其对堆肥理化性质的影响研究。结果表明，C/N=25、30 堆肥处理的有机物降解 率高于低碳氮比处理；全氮含量随着有机物的降解而浓缩，随着堆肥的进行而不断提高，到堆肥结束时，C/N=15、20、25 和30 处理 的全氮含量分别为23.5、24、27.8 g ·kg-1 和28.4 g ·kg-1 ；堆肥过程中，C/N=15、20、25 和30 的堆肥处理CH4 累积排放为0.67、0.95、2.25 g ·kg-1 和1.80 g·kg-1 ，损失比例占初始碳物质的0.39% 、0.5% 、1.24%和0.92% ，并且CH4 气体的排放主要集中在高温前期，高温期越 长，排放的温室气体越多。高温期适当增大通气量，对于控制堆肥温度和减少温室气体生成有双重作用。 关键词：好氧堆肥；C/N 比；碳素物质；甲烷 中图分类号：S141.4 文献标志码：A 文章编号：1672- 2043(2010)07- 1388- 06 C Matter Change of Composting with Different C/N 1 2 2 2 QIN Li , SHEN Yu-jun , LI Guo-xue , HU Ju （1.Agro-Environmental Protection Institute, the Ministry of Agriculture, Tianjin 300191, China; 2．College of Resources and Environment Science,China Agriculture University, Beijing 100193, China） Abstract ：Aiming at the problem that a small amount of CH4 and other greenhouse gas emission in the composting process caused environ－ mental pollution and other issues, the laws of the gas release, the impact factor and its effect on physical and chemical properties of compost in the composting process with different carbon and nitrogen ratio and ventilation conditions were studied. The results showed that ：organic matter degradation rate of the disposals with C/N ratio of 25 and 30 was higher than that with low-carbon and nitrogen; the total nitrogen con－ tent concentrated with organic matter degradation, and continuously improved with the composting process, by the end of composting, the total nitrogen of the disposals with C/N ratio of 15, 20, 25 and 30 respectively were 23.5, 24, 27.8 g ·kg-1 and 28.4 g ·kg-1;in the composting pro－ cess, cumulative CH4 emissions of the d