越橘与根际微生物互作影响中国北方森林火干扰后的自然演替过程的机制研究

[Objective]Wildfires change forest structure directly and indirectly,posing a serious threat to forest ecosystems.The regulatory mechanism of natural succession processes after wildfires is largely unknown,and understanding this mechanism is particularly important for vegetation restoration affected by wildfires.[Method]We used a combination of field investigation and experimental operation by constructing the rhizosphere soil microbial community structure,indoor cultivation of lingonberry aseptic seedlings,screening specific mycorrhizal fungi and rhizosphere bacteria,and measuring plant root exudates.[Result]The results showed that the growth and development of lingonberry were greatly affected in the early stage of succession after wildfire.Wildfire changed the microbial community structure of the lingonberry rhizosphere,but the ability to utilize cellulose and lignin by interacting with mycorrhizal fungi did not change.The results of seed germination showed that the root exudates of lingonberry and birch affected the germination of seeds in the early stage of forest succession.[Conclusion]Our data show that wildfires have an impact on the microbial structure of the lingonberry rhizosphere.The change in microorganisms in the rhizosphere soil of lingonberry did not affect the ability of the interaction between lingonberry and rhizosphere microorganisms to decompose cellulose and lignin.However,lingonberry secretions can affect the seed germination of birch and larch.The interaction between lingonberry and rhizosphere microorganisms may be one of the patterns of natural recovery after wildfires in northern forests.