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首页> 外文期刊>Fresenius environmental bulletin >SENSITIVITY OF SOIL UREASE TO SOIL CONTAMINATION BY ZINC, COPPER, NICKEL, CADMIUM AND LEAD
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SENSITIVITY OF SOIL UREASE TO SOIL CONTAMINATION BY ZINC, COPPER, NICKEL, CADMIUM AND LEAD

机译：土壤脲酶对锌，铜，镍，镉和铅污染土壤的敏感性。

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The research objective has been to determine relationships between the activity of urease, its resistance and soil contamination with Zn2+, Cu2+, Ni2+, Cd2+ and Pb2+ in an experimental set up on loamy sand, sandy loam and sandy clay loam of pH values 5.5 and 7.0. The research comprised laboratory experiments. Soil (loamy sand, sandy loam and sandy clay loam) was polluted with the above metals and, on days 30, 60 and 120 of incubation, it was submitted to determination of the activity of urease. The results were used to calculate the resistance index (RS) of urease to contamination by heavy metals. The experimental results proved that the highest urease activity persisted in sandy clay loam and the lowest one appeared in loamy sand. The heavy metals significantly inhibited urease. The most severe inhibition of urease was caused by Zn2+ and Cu2+, less so by Ni2+ and Cd2+, while Pb2+ was responsible for the weakest urease inhibition. Strict correlation was found between the resistance of urease and the level of soil contamination by heavy metals. The highest resistance was demonstrated by urease in Cd-polluted sandy clay loam at pH 7.0, where the RS index ranged from 0.698 to 0.931. The lowest values of the RS index were observed in the same type of soil polluted by Zn2+ (RS from 0.823 to 0.016), Cu2+ (RS from 0.404 to 0.070) and Ni2+ (RS from 0.810 to 0.040).
机译：研究目的是在pH值为5.5和7.0的壤土，砂壤土和砂质壤土上建立尿素酶活性，抗性和土壤中Zn2 +，Cu2 +，Ni2 +，Cd2 +和Pb2 +污染的关系。 。该研究包括实验室实验。用上述金属污染土壤（壤土，壤土和砂质壤土），并在培养的第30、60和120天进行尿素酶活性的测定。结果用于计算脲酶对重金属污染的抵抗指数（RS）。实验结果表明，在砂质壤土中脲酶活性最高，而在壤土中最低。重金属显着抑制脲酶。对尿素酶的最严重抑制作用是由Zn2 +和Cu2 +引起的，而对Ni2 +和Cd2 +的抑制作用较小，而Pb2 +对尿素酶的抑制作用最弱。尿素酶的抵抗力与土壤对重金属的污染程度之间存在严格的相关性。在pH值为7.0的Cd污染的沙质壤土中，脲酶表现出最高的抗性，其RS指数为0.698至0.931。在受Zn2 +（RS从0.823至0.016），Cu2 +（RS从0.404至0.070）和Ni2 +（RS从0.810至0.040）污染的同一类型土壤中，RS指数最低。

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