Changes of Soil Microbiological Characteristics After Solidago canadensis L. Invasion

doi:10.1016/S1671-2927(11)60095-3

摘要/Abstract

摘要： The relationship between Solidago canadensis L. invasion and soil microbial communities was studied across the invasivegradients varying from 0 to 40, 80, and 100% coverage of S. canadensis. The results showed both soil microbial biomassC (Cmic) and N (Nmic) increased as the coverage of S. canadensis increased. Soil microbial quotient Cmic/Corg (microbialbiomass C/organic C) tended to increase linearly with the coverage of S. canadensis. Soil basal respiration (BR) alsoshowed a similar trend. The soil respiratory quotient qCO2 decreased with S. canadensis invasion, and remained at quitea constantly low level in the invasive soils. Sole carbon source utilization profiles analyses indicated that S. canadensisinvasion tended to result in higher microbial functional diversity in the soil. Average utilization of specific substrateguilds was highest in the soil with S. canadensis monoculture. Principle component analysis of sole carbon sourceutilization profiles further indicated that microbial functional diversity in the soil with S. canadensis monoculture wasdistinctly separated from those soils in the native area and the ecotones. In conclusion, S. canadensis invasion improvedsoil microbial biomass, respiration and utilization of carbon sources, and decreased qCO2, thus created better soil conditions,which in turn were more conducive to the growth of S. canadensis.

关键词:

sole carbon source utilization, functional diversity, microbial biomass, microbial respiratory, Solidago canadensis

Abstract: The relationship between Solidago canadensis L. invasion and soil microbial communities was studied across the invasivegradients varying from 0 to 40, 80, and 100% coverage of S. canadensis. The results showed both soil microbial biomassC (Cmic) and N (Nmic) increased as the coverage of S. canadensis increased. Soil microbial quotient Cmic/Corg (microbialbiomass C/organic C) tended to increase linearly with the coverage of S. canadensis. Soil basal respiration (BR) alsoshowed a similar trend. The soil respiratory quotient qCO2 decreased with S. canadensis invasion, and remained at quitea constantly low level in the invasive soils. Sole carbon source utilization profiles analyses indicated that S. canadensisinvasion tended to result in higher microbial functional diversity in the soil. Average utilization of specific substrateguilds was highest in the soil with S. canadensis monoculture. Principle component analysis of sole carbon sourceutilization profiles further indicated that microbial functional diversity in the soil with S. canadensis monoculture wasdistinctly separated from those soils in the native area and the ecotones. In conclusion, S. canadensis invasion improvedsoil microbial biomass, respiration and utilization of carbon sources, and decreased qCO2, thus created better soil conditions,which in turn were more conducive to the growth of S. canadensis.

Key words: sole carbon source utilization, functional diversity, microbial biomass, microbial respiratory, Solidago canadensis

LIAO Min, XIE Xiao-mei, PENG Ying, MA Ai-li. Changes of Soil Microbiological Characteristics After Solidago canadensis L. Invasion[J]. Journal of Integrative Agriculture, 2011, 10(7): 1064-1071.

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