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Chinese Journal of Applied Ecology ›› 2017, Vol. 28 ›› Issue (12): 4017-4024.doi: 10.13287/j.1001-9332.201712.019

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Effect of soil phenolic acids on soil microbe of coal-mining depressed land after afforestation restoration by different tree species

JI Li1,2, YANG Li-xue1*   

  1. 1School of Forestry, Northeast Fore-stry University, Harbin 150040, China
    2Jilin Academy of Forestry, Changchun 130033,China
  • Received:2017-03-27 Online:2017-12-18 Published:2017-12-18
  • Contact: * E-mail: ylx_0813@163.com
  • Supported by:

    This work was supported by the Fundamental Research Fund for the Central Universities (2572016EAJ1) and the National Natural Science Foundation of China (NSFC31170583)

Abstract: Phenolic acids are one of the most important factors that influence microbial community structure. Investigating the dynamic changes of phenolic acids and their relationship with the microbial community structure in plantation soils with different tree species could contribute to better understanding and revealing the mechanisms of microbial community changes under afforestation restoration in coal-mining subsidence areas. In this study, plantations of three conifer and one deciduous species (Pinus koraiensis, Larix gmelinii, Pinus sylvestris var. mongolica, and Populus ussuriensis) were established on abandoned coal-mining subsidence areas in Baoshan District, Shuangyashan City. The contents of soil phenols, 11 types of phenolic acids, and microbial communities in all plots were determined. The results showed that the contents of soil complex phenol in plantations were significantly higher than that of abandoned land overall. Specifically, soils in larch and poplar plantations had higher contents of complex phenol, while soils in larch and Korean pine plantations had greater contents of total phenol. Moreover, soil in the P. koraiensis plantation had a higher content of water-soluble phenol compared with abandoned lands. The determination of 11 phenolic acids indicated that the contents of ferulic acid, abietic acid, β-sitosterol, oleanolic acid, shikimic acid, linoleic acid, and stearic acid were higher in plantation soils. Although soil phenol contents were not related with soil microbial biomass, the individual phenolic acids showed a significant relationship with soil microbes. Ferulic acid, abietic acid, and β-sitosterol showed significant promoting effects on soil microbial biomass, and they showed positive correlations with fungi and fungi/bacteria ratio. These three phenolic acids had higher contents in the poplar plantation, suggesting that poplar affo-restation had a beneficial effect on soil quality in coal-mining subsidence areas.