Soil microbial communities and enzyme activities in a reclaimed coastal soil chronosequence under rice-barley cropping

文献类型： 外文期刊

第一作者： Fu, Qinglin

作者： Fu, Qinglin;Liu, Chen;Ding, Nengfei;Lin, Yicheng;Guo, Bin;Luo, Jiafa;Wang, Hailong

作者机构：

关键词： Denaturing gradient gel electrophoresis (DGGE);Electrical conductivity (EC);Enzyme activity;Microbial community structure;Reclamation;Soil organic carbon (SOC)

期刊名称：JOURNAL OF SOILS AND SEDIMENTS （ 影响因子：3.308； 五年影响因子：3.586 ）

ISSN： 1439-0108

年卷期： 2012 年 12 卷 7 期

页码：

收录情况： SCI

摘要： A field experiment with a reclamation chronosequence under rice-barley cropping was conducted to investigate soil enzyme activities and microbiology in a coastal saline soil. The aim of this study was to test whether changes in enzyme activity and microbial community structure are directly impacted by changes in soil pH, electrical conductivity (EC), and organic carbon (SOC) due to reclamation. The research area is located in south-eastern China. Four experimental sites were reclaimed in 1976, 1984, 1996, and 2006, respectively, and each site was divided into three plots, each of which was 22 m x 10 m. Each year, the plots were planted with rice (cv Xiushui) in summer and barley (cv Yanmai) in winter. Soil pH and EC were determined in an aqueous suspension with a 1:5 ratio of soil and water. Soil organic carbon content was measured by dichromate oxidation with heating. Measured soil enzyme activities included catalase, urease, and protease. Soil microbial community structures were assessed using denaturing gradient gel electrophoresis. Reclamation under rice-barley cropping reduced EC and pH, but increased SOC, the activities of catalase, urease and protease, and the cell numbers of bacteria, actinomycetes, and fungi, resulting in an increase in the bacterial community diversity. The enzyme activities and bacterial community diversity were significantly positively correlated with SOC, and negatively correlated with pH and EC. Five bacterial groups related to Gaetbulibacter, Sporosarcina, Flavobacterium, Aequorivita, and Gillisia, which have been associated with saline waters, did not appear in the soils that had been reclaimed prior to 1996. Results of this field study suggest that soil properties which affect microbial activity such as EC, pH, and SOC significantly influence the activities of catalase, urease, and protease, and microbial community composition. More than 10 years after reclamation under rice-barley cropping, EC had decreased and bacteria typically found in marine and saline environments had disappeared from the soil.

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