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汞污染对水稻土微生物和酶活性的影响

荆延德1,2;何振立2,3;杨肖娥2   

  1. 1曲阜师范大学资源与规划学院, 山东济宁 273165; 2浙江大学环境与资源科学学院环境修复与生态健康教育部重点实验室, 杭州 310029; 3IFAS & IRREC,University of Florida, Fort Pierce,Florida 34945,USA
  • 收稿日期:2008-05-14 修回日期:1900-01-01 出版日期:2009-01-20 发布日期:2009-01-20

Effects of Hg contamination on paddy soil microbial and enzymatic activities.

JING Yan-de1,2;HE Zhen-li2,3;YANG Xiao-e2   

  1. 1Department of Resources and Planning, Qufu Normal University, Jining 273165, Shandong, China;2Ministry of Education Key Laboratory of Environment, Remediation and Ecosystem Health, College of Natural Resource and Environment Science, Zhejiang University, Hangzhou 310029, China;3Institute of Food and Agricultural SciencesIndian River Research and Education Center, University of Florida, Fort Pierce, Florida 34945, USA
  • Received:2008-05-14 Revised:1900-01-01 Online:2009-01-20 Published:2009-01-20

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(<2 mg Hg·kg-1)时升高,而在高浓度汞处理(≥2 mg Hg·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ED50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.

关键词: 生态工程, 植被动态, 人类活动

Abstract: With pot experiment, the microbial and enzymatic activities in two paddy soils w ere investigated at different Hg2+ loadings. The results showed that a fter harvest, all measured microbiological and enzymological indices including m icrobial biomass carbon, respiration rate, and activities of urease, acid phosph atase, 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 -1), 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 activit y in test yellowish red soil was higher than that in test silty loam soil. ED 50 analysis indicated that Hg had a stronger ecological toxicity on soil ure ase in test silty loam soil and on acid phosphatase in test yellowish red soil.

Key words: vegetation dynamics, human activity, ecological project.