南亚热带乡土树种与桉树人工林土壤真菌群落多样性和功能类群的比较  

Comparison of soil fungal community diversity and functional groups between native tree species and Eucalyptus plantations in south subtropical China

作　　者：席守鸿 明安刚[2,3] 谭玲 何江[1] 覃林 XI Shouhong;MING An'gang;TAN Ling;HE Jiang;QIN Lin(Guangxi Key Laboratory of Forest Ecology and Conservation,College of Forestry,Guangxi University,Nanning 530004,China;Experiment Center of Tropical Forestry,Chinese Academy of Forestry,Pingxiang 532600,Guangxi,China;Guangxi Youyiguan Forest Ecosystem National Observation and Research Station,Pingxiang 532600,Guangxi,China)

机构地区：[1]广西大学林学院,广西森林生态与保育重点实验室,南宁530004 [2]中国林业科学研究院热带林业实验中心,广西凭祥532600 [3]广西友谊关森林生态系统国家定位观测研究站,广西凭祥532600

出　　处：《广西植物》2024年第7期1232-1244,共13页Guihaia

基　　金：国家自然科学基金(31560109,32071764);广西自然科学基金(2020GXNSFAA297208)。

摘　　要：营造乡土树种人工林和桉树人工林是我国南亚热带森林经营的常见模式。为探究土壤真菌群落多样性及功能对乡土树种和桉树人工林的响应特征与机制,该研究以南亚热带4个乡土树种人工林[马尾松(Pinus massoniana)、火力楠(Michelia macclurei)、米老排(Mytilaria laosensis)、红锥(Castanopsis hystrix)]和外来树种尾巨桉(Eucalyptus urophylla×E.grandis)人工林为对象,基于各林分土壤(0~20 cm)真菌18S rRNA高通量测序数据,利用FUNGuild数据库,比较分析乡土树种与尾巨桉人工林土壤真菌群落多样性和功能类群的差异特性及影响的主导土壤环境因子。结果表明:(1)5个研究林分的土壤真菌优势门均为子囊菌门和担子菌门,但不同乡土树种林分与尾巨桉林的土壤真菌优势目存在差异。(2)尾巨桉林土壤真菌群落α多样性高于乡土树种人工林,其群落组成结构也与乡土树种人工林存在显著差异(P<0.05)。(3)4个乡土树种人工林土壤的腐生营养型的相对丰度高于尾巨桉林,并且火力楠林和米老排林土壤丛枝菌根真菌的相对丰度明显高于尾巨桉林,尾巨桉林土壤共生营养型以及外生菌根真菌和木材腐生菌的相对丰度明显高于乡土树种人工林。(4)pH是导致尾巨桉林与乡土树种人工林土壤真菌群落多样性和功能类群差异的主要土壤环境因子。综上认为,在南亚热带地区将尾巨桉林改建成火力楠林或米老排林可提高土壤养分水平,提升土壤生态功能。Planting native tree species plantations and Eucalyptus plantations is a common model of forest management in south subtropical China.To explore the response characteristics and mechanisms of soil fungal community diversity and function to native tree species and Eucalyptus plantations.four native tree species plantations(Pinus massoniana,Michelia macclurei,Mytilaria laosensis,Castanopsis hystrix)and exotic tree species Eucalyptus urophylla×E.grandis(EUG)plantations in south subtropical China were studied.Based on 18S rRNA high-throughput sequencing data of fungi in soil(0-20 cm)of each stand and FUNGuild database,the differences of diversity and functional group of soil fungal communities between native tree species and EUG plantations were compared and analyzed,as well as the dominant soil environmental factors affecting them.The results were as follows:(1)The dominant phyla of soil fungi in 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)Theαdiversity of soil fungal community in EUG plantation was higher than that in native tree plantations,and the community composition structure 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 significantly higher than that of EUG plantation.The relative abundance of soil symbiotroph,ectomycorrhizal fungi and wood saprotroph in EUG plantation was significantly higher than that in the native tree plantations.(4)pH was the crucial soil environmental factor that led to 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 spe

关 键 词：土壤真菌群落 Illumina MiSeq高通量测序 FUNGuild数据库 乡土树种人工林 桉树人工林 

分 类 号：Q948[生物学—植物学]