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Decay stages and meteorological factors affect microbial community during leaf litter in situ decomposition

Soil Ecology Letters 2023年第3期5卷 61-73页

作者： Haixin Zhang Yimei Huang Shaoshan An Quanchao Zeng Baorong Wang Xuejuan Bai Qian Huang Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China Ministry of AgricultureCollege of Natural Resources and EnvironmentNorthwest A&F UniversityYangling 712100China State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water ConservationNorthwest A&F UniversityYangling712100China Huazhong Agricultural University College of Resources&EnvironmentWuhan 430070China State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water ConservationChinese Academy of Sciences andMinistry of Water ResourcesYangling 712100China

litter microorganisms play a crucial role in the biological decomposition in forest ecosystems;however,the coupling effect of meteorological and substrate changes on it during the different stages of leaf decomposition in situ remains unclear.Hence,according to meteorological factors dynamics,a one-year field litter of Quercus wutaishanica in situ decomposition experiment was designed for four decay stages in a warm temperate forest.Microbial community composition was characterized using Illumina sequencing of fungal ITS and bacterial 16S genes.Bacterial(6.6)and fungal(3.6)Shannon indexes were the largest after 125 days’litter decomposition(October).The relative abundance of Acidobacteria after 342 days and Bacteroidetes after 125 days were 3 and 24 times higher than after 31 days,respectively.Some non-dominant species(bacteria:Firmicutes,Planctomycotes,and Verrucomicrobia;fungi:Chytridiomycota and Glomeromomycota)may be absent or present at different decomposition stages due to litter properties or meteorological factors.Chemoheterotrophy and aerobic-chemoheterotrophy were the dominant bacterial functional groups,and the dominant fungal functional groups were saprotrophs,pathotrophs,and symbiotrophs.Precipitation and relative humidity significantly affected bacteria.Temperature,sunlight intensity,and net radiation significantly affected fungi.Besides,among the relative contributions of changes in bacterial and fungal community structure,leaf litter properties alone explained the variation of 5.51%and 10.63%.Microbial diversity and decay stage directly affected the litter mass-loss rate,with meteorological factors(precipitation,relative humidity,air temperature,and sunlight intensity)being indirect.Our findings highlight the importance of microbial diversity for leaf litter decomposition and the influence of meteorological factors.

关键词： leaf litter decomposition microbial community composition meteorological factors Loess Plateau Quercus wutaishanica

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Fungal community succession on decomposing leaf litter across five phylogenetically related tree species in a subtropical forest

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Fungal Diversity 2022年第4期115卷 73-103页

作者： Danushka S.Tennakoon Chang‑Hsin Kuo Witoon Purahong Eleni Gentekaki Chayakorn Pumas Itthayakorn Promputtha Kevin D.Hyde Center of Excellence in Fungal Research Mae Fah Luang UniversityChiang Rai 57100Thailand School of Science Mae Fah Luang UniversityChiang Rai 57100Thailand Research Center of Microbial Diversity and Sustainable Utilization Chiang Mai UniversityChiang Mai 50200Thailand Department of Biology Faculty of ScienceChiang Mai UniversityChiang Mai 50200Thailand Department of Plant Medicine National Chiayi University300 Syuefu RoadChiayi City 60004Taiwan Department of Soil Ecology UFZ-Helmholtz Centre for Environmental ResearchTheodor-Lieser-Str.406120 Halle(Saale)Germany Innovative Institute for Plant Health Zhongkai University of Agriculture and EngineeringHaizhu DistrictGuangzhou 510225People’s Republic of China Environmental Science Research Center Faculty of ScienceChiang Mai UniversityChiang Mai 50200Thailand

Fungi are an essential component of the ecosystem.They play an integral role in the decomposition of leaf litter and return nutrients to the ecosystem through nutrient cycling.They are considered as the“key players”in leaf litter decomposition,because of their ability to produce a wide range of extracellular enzymes.Time-related changes of fungal communities during leaf litter decomposition have been relatively well-investigated.However,it has not been established how the tree species,tree phylogeny,and leaf litter chemistry influence fungal communities during decomposition.Using direct observations and a culturing approach,this study compiles fungi found in freshly collected leaf litter from five phylogenetically related,native tree species in Taiwan:Celtis formosana(CF),Ficus ampelas(FA),Ficus septica(FS),Macaranga tanarius(MT),and Morus australis(MA).We investigated(i)the effects of tree species(including tree phylogeny)and leaf litter chemistry on fungal community succession,and(ii)specific patterns of fungal succession(including diversity and taxonomic community assembly)on decomposing leaf litter across the selected tree species.We hypothesized that host species and leaf litter chemistry significantly affect fungal community succession.A total of 1325 leaves(CF:275,FA:275,FS:275,MT:275 and MA:225)were collected and 236 fungal taxa were recorded(CF:48,FA:46,FS:64,MT:42 and MA:36).Tree species relationships had variable associations on the fungal communities,as even closely related tree species had strongly differing communities during decomposition.A high number of species were unique to a single tree species and may indicate‘host-specificity’to a particular leaf litter.The overlap of microfungal species in pair wise comparisons of tree species was low(7–16%),and only 1–2%of microfungal species were observed in leaves of all tree species.The percentage of occurrences of fungal communities using Hierarchical Cluster Analyses(HCA)showed that there were at least four succession stages in each tree species durin

关键词： Fungal diversity Ecology leaf litter decomposition Percentage of occurrences Taxonomy

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