Subjects: Biology >> Botany >> Applied botany submitted time 2023-05-21 Cooperative journals: 《广西植物》
Abstract： Planting native tree species plantations and Eucalyptus plantations is a common model of forest management in south subtropical China, but the response characteristics and mechanisms of soil fungal community diversity and functions to native tree species and Eucalyptus plantations are still unclear. Based on the 18S rRNA high-throughput sequencing data of soil (0-20cm) in each stand and FUNGuild database, this study took 4 native tree species plantations(Pinus massoniana, Michelia macclurei, Mytilaria laosensis, Castanopsis hystrix) and exotic tree species Eucalyptus urophylla × E. grandis(EUG) plantations in the south subtropical China as the research object, and compared and analyzed the diversity and functional groups of soil fungal communities between native tree species and EUG plantations, as well as the dominant soil environmental factors affecting them. The results were as follows: (1)The dominant phyla of soil fungi in the five stands were both Ascomycota and Basidiomycota, but there were differences in the dominant orders of soil fungi between different native tree species and EUG plantations. (2) The α diversity of soil fungal communities in EUG plantation was higher than that in native tree plantations, and the community composition was significantly different from the native tree plantations(P<0.05). (3)The relative abundance of saprotroph in the native tree plantations was higher than that of EUG plantation, and the relative abundance of soil arbuscular mycorrhizal fungi in Michelia macclurei and Mytilaria laosensis plantations was markedly higher than that of EUG plantation. The relative abundance of soil symbiotroph, ectomycorrhizal fungi and wood saprotroph in EUG plantation was remarkably higher than that in the native tree plantations. (4) pH was the crucial soil environmental factor regulating the difference of soil fungal community diversity and functional group between EUG and native tree plantations. In general, there were significant differences in the structure and function of soil fungal community between native tree plantations and EUG plantations, which indicated that different stand types had great effects on soil fungal community and function. In conclusion, it is concluded that the soil nutrient level can be improved by converting the EUG plantation into native tree species plantations in the south subtropical China, and the soil ecological function could be improved by choosing Michelia macclurei or Mytilaria laosensis plantation as native tree species plantation.
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