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Microbial Community Characteristics in a Degraded Wetland of the Yellow River Delta

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Five different sites with a soluble salt gradient of 3.0-17.7 g kg-1 dry soil from the coast to the inland were selected,and the microbial population size,activity and diversity in the rhizospheres of five common plant species and the adjacent bulk soils(non-rhizosphere)were compared in a degraded wetland of the Yellow River Delta,Shandong Province,China to study the effects of soil environment(salinity,seasonality,depth,and rhizosphere)on microbial communities and the wetland's ecological function,thus providing basic data for the bioremediation of degraded wetlands.There was a significant negative linear relationship between the salinity and the total number of microorganisms,overall microbial activity,or culturable microbial diversity.Salinity adversely affected the microbial community,and higher salinity levels resulted in smaller and less active microbial communities.Seasonal changes were observed in microbial activity but did not occur in the size and diversity.The microbial size,activity and diversity decreased with increasing soil depth.The size,activity and diversity of culturable microorganisms increased in the rhizospheres.All rhizospheres had positive effects on the microbial communities,and common seepweed had the highest rhizosphere effect.Three halophilic bacteria(Pseudomonas mendocina,Burkholderia glumae,and Acinetobacter johnsonii)were separated through BIOLOG identification,and common seepweed could be recommended for bioremediation of degraded wetlands in the Yellow River Delta.

microbial activitymicrobial diversityrhizospheresalinitysoil microorganisms

WANG Zhen-Yu、XIN Yuan-Zheng、GAO Dong-Mei、LI Feng-Min、J.MORGAN、XING Bao-Shan

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College of Environmental Science and Engineering,Ocean University of China,Qingdao 266100 China

Department of Plant,Soil and Insect Sciences,University of Massachusetts,Amherst,MA 01003USA

Supported by the National Natural Science Foundation of ChinaNational Key Technology R&D Program of ChinaProgram for New Century Excellent Talents in University,ChinaCheung Kong Scholar Program of the Education Ministry of China

305703402006BAC01A13NCET06-0599

2010

土壤圈(英文版)
中国土壤学会,中科院南京土壤研究所和土壤与农业可持续发展国家重点实验室

土壤圈(英文版)

CSTPCDCSCDSCI
影响因子：0.477
ISSN：1002-0160
年,卷(期)：2010.20(4)
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