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汞对土壤酶活性的影响

[Effects of Hg on soil enzyme activity].

作者信息

Yang Chun-Lu, Sun Tie-Heng, He Wen-Xiang, Chen Su

机构信息

Key Laboratory of Environmental Engineering, Shenyang University, Shenyang 110044, China.

出版信息

Ying Yong Sheng Tai Xue Bao. 2007 Mar;18(3):620-4.

Abstract

With simulation test, this paper studied the effects of Hg on the activities of urease, invertase and neutral phosphotase in four soils. The results showed that Hg inhibited soil urease and invertase activities markedly, but its inhibitory effect differed with test soils. There was a significant logarithmic correlation between the concentration of HgCl2 and the activities of these two enzymes (P < 0.05). In test soils, the ED50 of urease activity was 87.99, 5.47, 24.05 and 19.88 mg x kg(-1), and that of invertase activity was 76.68, 727.49, 236.52 and 316.59 mg x kg(-1), respectively. Urease was more sensitive than invertase to Hg contamination, while organic matter had a protective effect on soil enzymes. Soil neutral phosphatase was not sensitive to Hg contamination, except that it was significantly activated by Hg in the meadow brown soil applied with plenty of organic fertilizer.

摘要

通过模拟试验,研究了汞对4种土壤中脲酶、蔗糖酶和中性磷酸酶活性的影响。结果表明,汞显著抑制土壤脲酶和蔗糖酶活性,但其抑制效果因供试土壤而异。HgCl₂浓度与这两种酶的活性之间存在显著的对数相关关系(P < 0.05)。在供试土壤中,脲酶活性的半数有效剂量(ED50)分别为87.99、5.47、24.05和19.88 mg·kg⁻¹,蔗糖酶活性的半数有效剂量分别为76.68、727.49、236.52和316.59 mg·kg⁻¹。脲酶对汞污染比蔗糖酶更敏感,而有机质对土壤酶有保护作用。土壤中性磷酸酶对汞污染不敏感,只是在施用大量有机肥的草甸棕壤中汞对其有显著激活作用。

相似文献

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