中文摘要：

通过盆栽试验，研究了两种水稻土中不同汞处理的微生物学和酶学效应．结果表明：水稻收获后，除部分土壤的呼吸强度和代谢商随汞处理浓度的增加而持续增加外，不同浓度汞处理后土壤微生物量碳、呼吸强度、土壤脲酶、酸性磷酸酶和脱氢酶均表现为在低浓度汞处理（＜2mgHg·kg^-1）时升高，而在高浓度汞处理（≥2mgHg·kg^-1）时则下降。土壤微生物商是对汞处理比较敏感的微生物学指标．黄红壤不同浓度汞处理的土壤酶活性大于小粉土．对重金属生态剂量ED铀进行分析表明，汞对小粉土脲酶活性和黄红壤磷酸酶活性的生态毒性均较强．

英文摘要：

With pot experiment, the microbial and enzymatic activities in two paddy soils were investigated at different Hg^2＋ loadings. The results showed that after harvest, all measured microbiological and enzymological indices including microbial biomass carbon, respiration rate, and activities of urease, acid phosphatase, and dehydrogenase in test soils were increased under low Hg treatments （ 〈 2 mg Hg · kg^-1） while decreased under high Hg treatments （ ≥2 mg Hg · kg^-l） , except the basal respiration and metabolic quotient were partly increased with increasing Hg level. Among the test indices, soil microbial quotient was a microbiological index more sensitive to Hg contamination. The enzymatic aetivity in test yellowish red soil was higher than that in test silty loam soil. ED50 analysis indicated that Hg had a stronger ecological toxicity on soil urease in test silty loam soil and on acid phosphatase in test yellowish red soil.