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中南大学学报(英文版)

Journal of Central South University

Vol. 20    No. 3    March 2013

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Characteristics of soil microbial community functional and structure diversity with coverage of Solidago Canadensis L
LIAO Min(廖敏)1, XIE Xiao-mei(谢晓梅)2, PENG Ying(彭英)1,3, CHAI Juan-juan(柴娟娟)1,3, Chen Na(陈娜)1,3

1. Department of Resources Science, College of Environmental and Resources Sciences,
Zhejiang University, Hangzhou 310058, China;
2. Center of Experiment Teaching, College of Environmental and Resource Sciences,
 Zhejiang University, Hangzhou 310058, China;
3. Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition, Hangzhou 310058, China

Abstract:The relationship between Solidago canadensis L. invasion and soil microbial community diversity including functional and structure diversities was studied across the invasive gradients varying from 0 to 40%, 80%, and 100% coverage of Solidago canadensis L. using sole carbon source utilization profiles analyses, principle component analysis (PCA) and phospholipid fatty acids (PLFA) profiles analyses. The results show the characteristics of soil microbial community functional and structure diversity in invaded soils strongly changed by Solidago canadensis L. invasion. Solidago canadensis L. invasion tended to result in higher substrate richness, and functional diversity. As compared to the native and ecotones, average utilization of specific substrate guilds of soil microbe was the highest in Solidago canadensis L. monoculture. Soil microbial functional diversity in Solidago canadensis L. monoculture was distinctly separated from the native area and the ecotones. Aerobic bacteria, fungi and actinomycetes population significantly increased but anaerobic bacteria decreased in the soil with Solidago canadensis L. monoculture. The ratio of cy19:0 to 18:1ω7 gradually declined but mono/sat and fung/bact PLFAs increased when Solidago canadensis L. became more dominant. The microbial community composition clearly separated the native soil from the invaded soils by PCA analysis, especially 18:1ω7c, 16:1ω7t, 16:1ω5c and 18:2ω6, 9 were present in higher concentrations for exotic soil. In conclusion, Solidago canadensis L. invasion could create better soil conditions by improving soil microbial community structure and functional diversity, which in turn was more conducive to the growth of Solidago canadensis L.

 

Key words: sole carbon source utilization; phospholipid fatty acids; structure diversity; functional diversity; Solidago canadensis L.

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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