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Scientia Silvae Sinicae ›› 2024, Vol. 60 ›› Issue (9): 59-68.doi: 10.11707/j.1001-7488.LYKX20230360

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Effects of Mixed Plantation of Cunninghamia lanceolata and Phoebe chekiangensis on Root Exudates and Community Structure of Arbuscular Mycorrhizal Fungi

Shuya Yang,Jingru Wang,Yingying Zhu,Lita Yi,Meihua Liu*()   

  1. College of Forestry and Biotechnology, Zhejiang A & F University Hangzhou 311300
  • Received:2023-08-13 Online:2024-09-25 Published:2024-10-08
  • Contact: Meihua Liu E-mail:mhliu@zafu.edu.cn

Abstract:

Objective: This study aims to examine the effects of mixed plantation of Cunninghamia lanceolata and Phoebe chekiangensis on root exudates and community structure of arbuscular mycorrhizal fungi (AMF). The findings would provide theoretical reference for the management and productivity improvement of C. lanceolata plantations. Method: In a pure C. lanceolata forest, a pure of P. chekiangensis forest, and a mixed C. lanceolata and P. chekiangensis forest, soil samples were collected from 0–20 cm soil layer to analyze the differences in root exudates and AMF community structure in the pure and mixed forests, and to elucidate the effects of root exudates in the mixed forest on the community structure of AMFs. Result: Five main types of exudates with high content and allelopathic activity, 2,4-di-tert-butylphenol, dibutyl phthalate, methyl oleate, palmitic acid, and stearic acid, were detected in the soil samples from pure and mixed forests. Among them, the contents of methyl oleate, palmitic acid, and stearic acid varied significantly among different forest types. The number of operational taxonomic units (OTUs) and relative abundance of genera at the OTU level were the highest in the soil of pure P. chekiangensis forest, followed by mixed forest, and the lowest in pure C. lanceolata forest. The dominant genus of AMF in the soils of all three forests was Glomus. The percentage of Glomus was significantly reduced and the percentage of Gigaspora was increased in the mixed forest. Correlation analysis showed that dibutyl phthalate had a greater effect on soil AMF community structure in the C. lanceolata pure forest, and methyl oleate had a greater effect on soil AMF community structure in the mixed forest. Conclusion: The mixed plantation of C. lanceolata and P. chekiangensis results in changes in the content of allelochemicals and affects soil microbiome composition, resulting in significantly higher AMF community diversity and richness compared to pure Chinese fir forest. The results of this study can provide references for the selection of tree species in the“needle to broadleaved forests”conversation from pure C. lanceolata forests, and provide a new theoretical basis and ideas for improving the productivity of needle-broadleaved mixed forests.

Key words: mixed plantation, root exudates, arbuscular mycorrhizal fungi (AMF), Cunninghamia lanceolata, Phoebe chekiangensis, pure forest

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