生态学报2023，Vol.43Issue(23)：9912-9924,13.DOI:10.20103/j.stxb.202206231784
科尔沁沙地樟子松人工林土壤真菌共现网络及其与土壤因子的关系
Soil fungi co-occurrence network and its relationship with soil factors of Pinus sylvestris var.mongolica plantation in the Horqin Desert
摘要
Abstract
To reveal the interactions of soil fungi in Pinus sylvestris var.mongolica plantations in the Horqin Desert,we collected the soil of P.sylvestris plantations along stand ages(half-mature,near-mature,and mature forest)with two soil layers(0-10 cm and 10-20 cm),and the undeveloped forest land was regarded as a control.The network characteristics of soil fungi of P.sylvestris plantations and the influence of soil factors were clarified using molecular ecological network analysis based on stochastic matrix theory.The results indicated that(1)from half-mature to near-mature forest,there was an increase in the average degree and a decrease in the average path length decreased with a more complex fungi network;while the network characteristics from near-mature to mature forest were opposite.The soil fungal networks in the 10-20 cm soil layer,with lower average path length and higher average degree and average clustering coefficient,had more close interactions than 0-10 cm soil layer.The average degree of soil fungal network in undeveloped forest land was slightly lower than that in near-mature forest,and the average path length was lower than that in all P.sylvestris plantations.There were higher stability of soil fungal community in P.sylvestris plantations than undeveloped forest land.(2)The key species of soil fungi in half-mature,near-mature,mature plantations and undeveloped forest land were Guehomyces sp.,Oidiodendron sp.,Pseudeurotium sp.,and Alphamyces sp.,respectively.The key species in 0-10 cm soil layer was Russula sp.in P.sylvestris plantations and undeveloped forest land,the key species in 10-20 cm soil layer was Guehomyces sp.(3)The composition of soil fungi network in P.sylvestris plantations was significantly correlated with soil water content(P＜0.05).The soil total nitrogen was significantly negatively correlated with the soil fungal network,pH and available phosphorus were significantly positively correlated with soil fungi network(P＜0.05).In P.sylvestris plantations,the soil fungi community in the near-mature forest was more complex.With the increase of soil depth,the association of soil fungi are more closely.Soil fungi community was more stable after planting of P.sylvestris plantations.The keystone species of soil fungi were different among the stand ages and soil layers,soil water content is the main influence factor of soil fungi network composition,and the Operational Taxonomic Units(OTUs)of top 50 betweenness centrality were mainly affected by soil total nitrogen,pH,and available phosphorus.The improved information contributes a better understanding of the community structure of soil fungi in P.sylvestris plantations in the Horqin Desert,and provides the theoretical and technological support for P.sylvestris plantation management.关键词
樟子松/土壤微生物/共现网络/林龄/土层/科尔沁沙地Key words
Pinus sylvestris var.mongolica/soil microorganisms/co-occurrence network/stand age/soil layer/Horqin Sandy Land引用本文复制引用
刘明慧,柳叶,任悦,高广磊,丁国栋,张英,赵佩杉,刘轩..科尔沁沙地樟子松人工林土壤真菌共现网络及其与土壤因子的关系[J].生态学报,2023,43(23):9912-9924,13.基金项目
中央高校基本科研业务费项目(2021ZY47) （2021ZY47）
