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应用生态学报 ›› 2002, Vol. ›› Issue (2): 191-193.

• 研究论文 • 上一篇    下一篇

汞、镉对土壤脲酶活性影响的研究Ⅰ.尿素浓度

和文祥1,2, 朱铭莪1, 张一平1   

  1. 1. 西北农林科技大学资环学院, 杨凌 712100;
    2. 中国科学院南京土壤研究所, 南京 210008
  • 收稿日期:2001-05-19 修回日期:2001-09-07 出版日期:2002-02-15
  • 通讯作者: 和文祥,男,1968年生,博士,副教授.主要从事土壤生物化学和生态毒理研究,发表学术论文20余篇,E-mail:hewenxiang@sina.com
  • 基金资助:
    国家自然科学基金资助项目(39370148)

Effects of mercury and cadmium on the activity of urease in soils ⅠUrea concentration

HE Wenxiang1,2, ZHU Minge1, ZHANG Yiping1   

  1. 1. College of Resource and Environmental Science, Northwestern Agricultural-Forestry University of Science & Technology, Yangling 712100;
    2. Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008
  • Received:2001-05-19 Revised:2001-09-07 Online:2002-02-15

摘要: 对不同尿素浓度条件下重金属与土壤脲酶活性关系进行了研究,结果表明,尿素浓度对脲酶活性具有显著的影响,在供试浓度范围内可采用线性和Langmuir模型较好地表征二者关系,并得到脲酶活性的尿浓贡献率、尿浓贡献变化率和最大表观脲酶活性等参数;Hg、Cd明显降低了前述参数值,其中Hg+Cd复合污染的抑制作用最强,Hg的生态毒性最大;同时初步获得土壤酶促反应过程中存在吸附机制.

关键词: 土壤脲酶, Hg, Cd, 尿素浓度

Abstract: Relationship between urease activity and heavy metals(Hg and Cd) under the condition of different urea concentration was studied.The results showed that the added urea concentration had an obvious positive effect on urease activity.Line and Langmuir models could be well described the relationship within the urea concentration tested.The calculation of urease parameters such as urea percent,urea-varying percent, and the maximum superficial urease activity reflected that Hg and Cd could remarkably reduce the positive effect from added urea,combined pollution of Hg+Cd displayed the most inhibition of the positive effect,and Hg produced the most ecological toxicity acting on soil urease activity.There was an adsorption mechanism in the enzyme reaction.

Key words: Soil urease, Mercury, Cadmium, Urea concentration

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