Working Paper Article Version 1 This version is not peer-reviewed

The Influence of Transplanted Trees on Soil Microbial Diversity in Areas Affected by Coal Mining Subsidence of the Loess Plateau in China

Version 1 : Received: 22 September 2019 / Approved: 23 September 2019 / Online: 23 September 2019 (00:44:51 CEST)

How to cite: Guo, Y.; Liu, X.; Tsolmon, B.; Chen, J.; Wei, W.; Lei, S.; Yang, J.; Bao, Y. The Influence of Transplanted Trees on Soil Microbial Diversity in Areas Affected by Coal Mining Subsidence of the Loess Plateau in China. Preprints 2019, 2019090258 Guo, Y.; Liu, X.; Tsolmon, B.; Chen, J.; Wei, W.; Lei, S.; Yang, J.; Bao, Y. The Influence of Transplanted Trees on Soil Microbial Diversity in Areas Affected by Coal Mining Subsidence of the Loess Plateau in China. Preprints 2019, 2019090258

Abstract

Soil microbial diversity in areas affected by coal mining subsidence is closely associated with vegetation restoration. In this study, we compared the diversity of soil bacteria and fungi under different vegetation restoration modes in the subsidized Daliuta coal mining region in western China. The dominant bacteria, Actinobacteria, Proteobacteria, Chloroflexi, and Acidobacteria, were found at abundances of 29.43–34.68%, 15.87–24.75%, 13.09–19%, and 12.06–15.36%, respectively. The dominant fungi, Ascomycetes and Zygomycetes, had abundances of 23.96–71.08% and 10.42–56.26%, respectively. The diversity indices (Sobs, Shannon, and Chao1) of the rhizosphere soil bacteria and fungi were significantly lower in the primary Stipa breviflora phytocommunity than in the phytocommunities of transplanted trees. Among physicochemical soil parameters, total nitrogen (TN), total phosphorus (TP), water content (WC), and pH affected soil bacterial diversity, and available phosphorus (AP) and TN affected bacterial community structure the most. Furthermore, WC affected soil fungal diversity, whereas TP and TN mostly affected the fungal community structure. However, edaphic factors did not uniformly affect all microbial groups. Although TN, WC, and AP significantly influenced the species richness of Actinobacteria and Proteobacteria (p<0.05), TP was significantly negatively correlated with species richness in Acomycota, Basidiomycota, and Zygomycota (p<0.05). However, TN influenced the species richness of Zygomycota (p<0.05) . Furthermore, we found that the rhizosphere microbial diversity of the CK phytocommunity differed from that of the transplanted tree communities in the study area; i.e., the transplanted trees promoted soil microbial diversity in phytocommunities, and moreover, different edaphic factors varied in their effect on the community composition of rhizosphere bacteria and fungi. We will continue to monitor the soil microbial diversity in the study area with the goal to provide guidance for environmental remediation of areas affected by coal mining subsidence.

Subject Areas

transplanted trees; soil microbe diversity; coal mining subsidence areas; the loess plateau

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