尿素浓度、培养时间和温度对3种土壤尿素水解过程的影响
DOI: 10.7685/j.issn.1000-2030.2000.02.011, PP. 43-46
Keywords: 尿素,土壤,尿素水解作用,温度,培养时间
Abstract:
采用较宽幅度尿素浓度、不同温度和不同培养时间对潮土、灰钙土和黄棕壤中尿素水解过程进行了研究。结果表明,尿素水解速率深受土壤类型、尿素浓度、温度和培养时间的影响。在25～45℃范围内,当土壤溶液中尿素浓度大于3661mol/L以上时,灰钙土的尿素水解速率剧烈下降,培养时间越长,降幅越大。潮土在尿素浓度大于5008mol/L时也有类似现象。潮土和黄棕壤中存在高亲和性和低亲和性尿素水解反应,而灰钙土仅表现出低亲和性反应。土壤脲酶对尿素的亲和系数和尿素水解反应的最大初速度的大小受土壤类型、温度和培养时间的影响
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