摘要
通过鸡粪与玉米叶共堆肥试验,研究小麦秸秆生物炭、稻壳生物炭对共堆肥过程中碳氮比(C/N)、铵态氮(NH_4~+-N)及氨气(NH_3)挥发的影响。堆肥中2种生物炭分别以干质量分数的5%、10%、15%添加,结果表明,在堆肥过程中,添加3种比例的小麦秸秆生物炭处理(B_1、B_2、B_3)、稻壳生物炭处理(B_4、B_5、B_6)堆体的C/N减少量比对照的C/N减少量分别多0~2、2~4;NH_3排放浓度较比照分别降低了63.75%、78.44%、91.50%和70.13%、80.75%、92.63%。另外,在堆体NH_3排放高峰期,添加生物炭堆体的NH_4~+-N含量均明显低于对照,且NH_4~+-N含量随生物炭添加量的增加而减少。由结果可知,生物炭的添加可以降低堆肥过程中NH_3的挥发并促进保氮过程,且比表面积更大的稻壳生物炭对抑制NH_3排放的效果更好。
引文
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