摘要
研究结果表明 ,汞、镉对土壤脲酶活性具有显著的抑制作用 ,抑制幅度和强度分别以汞镉和汞为最大 ;相关分析显示 ,脲酶活性可作为土壤Hg及Hg +Cd污染程度的生化监测指标 ;当Hg、Cd含量分别达到 1 6 1 3～ 2 6 4 7mgkg- 1 和 477 78mgkg- 1 时 ,土壤已受到严重污染 ;在汞镉复合条件下 ,抑制仍以单独影响为主 ,且汞、镉间存在较弱的拮抗作用 ;温度和尿素浓度升高 ,可增强重金属对土壤脲酶活性的抑制作用。
The study shows that Hg and Cd had a remarkable inhibitory effect on soil urease activity, with Hg+Cd and Hg being the most in extent and intensity,respectively.Urease activity can be an index of Hg or Hg+Cd pollution of soil.The soils were polluted severely when the contents of Hg and Cd in the soil reached 1 613～2 647mg kg -1 and 481 09mg kg -1 respectively. In the case of Hg+Cd, the inhibition effect was mainly determined by either of the two elements. Hg and Cd showed weak antagonism in multiple treatments. Temperature and urea concentration could enhance heavy metals'inhibition effect on urease activity.
出处
《土壤学报》
CAS
CSCD
北大核心
2002年第3期412-420,共9页
Acta Pedologica Sinica
基金
国家自然科学基金资助项目 (批准号 39370 1 4 8)
