CAJ | 학술논문

为了解生物炭施入土壤后对尿素分解及土壤无机氮积累的影响，采用两种温度（300℃和600℃）下热解产生的玉米秸秆生物炭为试验材料，通过土壤灭菌与不灭菌处理对比，观察了生物炭施入土壤后对脲酶活性、尿素分解速度、无机氮积累、氨气排放和土壤pH的影响。结果表明：玉米秸秆生物炭在土壤中能够促进尿素的分解，使外加尿素在2 d内水解完毕，早于对照处理1 d；NH+4-N积累量和氨气的释放量均高于对照，短期培养结束后碱解氮含量低于对照。生物炭能够通过刺激土壤氮的矿化作用和微生物对有效氮的固定作用加快氮素的短期循环。
위료해생물탄시입토양후대뇨소분해급토양무궤담적루적영향，채용량충온도（300℃화600℃）하열해산생적옥미갈간생물탄위시험재료，통과토양멸균여불멸균처리대비，관찰료생물탄시입토양후대뇨매활성、뇨소분해속도、무궤담적루、안기배방화토양pH적영향。결과표명：옥미갈간생물탄재토양중능구촉진뇨소적분해，사외가뇨소재2 d내수해완필，조우대조처리1 d；NH+4-N적루량화안기적석방량균고우대조，단기배양결속후감해담함량저우대조。생물탄능구통과자격토양담적광화작용화미생물대유효담적고정작용가쾌담소적단기순배。
Recent studies have shown that biochar has potential to improve soil fertility and carbon sequestration. However, the effect of biochar on nitrogen transformation is poorly understood. The present study was carried out to determine the effect of corn stalk biochar(pro-duced at 300℃and 600℃)on urea-N hydrolysis. In a sterilization experiment, we examined urea hydrolysis rates, inorganic nitrogen ac-cumulation and ammonia volatilization in soil amended with biochar. In biochar treatments, urea hydrolysis was accelerated, and it was com-plete in 2 days, one day earlier than in CK. More ammonia was volatized as a result of increased soil pH induced by biochar application, and more NH+4-N was accumulated. After 12 days of incubation, available nitrogen content was lower in biochar treatments than in CK, indicat-ing that inorganic nitrogen might be partially immobilized.