| 贵州红枫湖沉积物有机质的酶及微生物降解 |
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| 引用本文： | 梁小兵,朱建明,刘丛强,魏中青,汪福顺,万国江,黄荣贵.贵州红枫湖沉积物有机质的酶及微生物降解[J].第四纪研究,2003,23(5):565-572. |
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| 作者姓名： | 梁小兵 朱建明 刘丛强 魏中青 汪福顺 万国江 黄荣贵 |
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| 作者单位： | 中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳,550002 |
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| 基金项目： | 国家自然科学基金项目 (批准号 :40 1 73 0 3 8)，中国科学院知识创新工程项目 (批准号 :KZCX2 -1 0 5 )，2 0 0 3年贵州
省科学技术基金项目资助 |
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| 摘 要： | 文章通过DNA、α-葡萄糖苷酶和硫酸盐还原菌等的变化,研究了贵州红枫湖沉积物中有机质的酶及微生物降解.有机质在微生物及其分泌的胞外酶的作用下被降解,在沉积物深度11cm以下被降解到相对较低的含量.DNA的分布表明表层9cm的沉积物深度内微生物的活动较为强烈,是微生物降解有机质的主要位置.α-葡萄糖苷酶在悬浮层含量最高,达0.75μmol/min*g干沉积物,提示有机质中的淀粉和糖原等物质在悬浮层降解较为激烈,被大量分解;随着沉积物深度的增加α-葡萄糖苷酶活性减弱,在有机质降解明显开始变缓的11cm沉积物中,α-葡萄糖苷酶活性已降低到0.17μmol/ming干沉积物.分子生物学的研究表明红枫湖沉积物表层7cm是硫酸盐还原菌的主要分布位置,结合有机质和SO2-4含量的研究结果,提示红枫湖沉积物中SO2-4不可能成为有机质氧化的主要电子受体,硫酸盐还原的限制因素也不是有机质供应.
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| 关 键 词： | 沉积物 有机质 酶 微生物 红枫湖 |
| 收稿时间： | 2003-04-21 |
| 修稿时间： | 2003年4月21日 |
ENZYMATIC AND MICROBIAL DEGRADATION OF ORGANIC MATTER IN LAKE HONGFENG OF GUIZHOU PROVINCE |
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| Liang\ Xiaobing\ \ Zhu\ Jianming\ \ Liu\ Congqiang\ \ Wei\ Zhongqing Wang\ Fushun\ \ Wan\ Guojiang\ \ Huang\ Ronggui.ENZYMATIC AND MICROBIAL DEGRADATION OF ORGANIC MATTER IN LAKE HONGFENG OF GUIZHOU PROVINCE[J].Quaternary Sciences,2003,23(5):565-572. |
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| Authors: | Liang\ Xiaobing\ \ Zhu\ Jianming\ \ Liu\ Congqiang\ \ Wei\ Zhongqing Wang\ Fushun\ \ Wan\ Guojiang\ \ Huang\ Ronggui |
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| Institution: | State Key Laboratory of Environmental Geochemistry, Geochemistry Institute, Chinese Academy of Sciences, Guiyang 550002 |
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| Abstract: | Enzymatic and microbial degradation of organic matter in Lake Hongfeng of Guizhou Province were studied through variations of DNA, α glucosidase and sulfate reduction bacteria.Organic matter is degraded by microbes and extracellular enzymes excreted by them, to a relative low content below 11cm of sediment depth. The variation of DNA contents indicated that microbe activities are strong in the upper 9cm which are main locations of organic matter degradation by microbes. Content of α glucosidase is highest in suspend layer, it is 0.75μmol /min·g dry sediments, suggesting starch and hepatin of organic matter are degraded strongly with a mass of decomposing. Activities of α gl ucosidase decrease with sediment depth. Below 11cm depth at which organic matter degradation star ted to slow, α glucosidase activity has reduced to 0.17μmol /min·g dry sediment. Molecular biological research indicated that the main distribution location of sulfate reduction bacteria among 7cm of upper layer sediments layer sediments of Lake Hongfeng. Combined with the research results of variations of organic matter and SO2-4, indicated that SO2-4 is not likely to become important electron acceptor and sulfate reduction is not limited by the supply of organic matter in Lake Hongfeng. |
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| Keywords: | sediments organic matter enzyme microbial Lake Hongfeng |
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