Antarctic soils select copiotroph-dominated bacteria
Antarctic soils select copiotroph-dominated bacteria
The life strategies of bacterial community determine their structure and function and are an important driver of biogeochemical cycling.However,the variations in these strategies under different soil resource conditions remain a fair amount of unclear.In this study,we explored the bacterial community life strategies and changes in structure and functions between Antarctic soils(lower resource conditions)and forest(temperate,subtropical,and tropical)soils(higher resource conditions).The results showed that the community weighted mean rRNA operon copy number in temperate soils was 19.5%lower than that in Antarctic soils(p<0.05),whereas no significant differences were observed among Antarctic,subtropical,and tropical soils(p>0.05).An unexpected result was that the bacterial communities in Antarctic soils tended to be copiotrophs(r-strategists),whereas those in temperate soils tended to be oligotrophs(K-strategists).Antarctic soils are enriched in Actinobacteriota,Bacteroidota,and other copiotrophs,whereas temperate soils are enriched in Acidobacteriota,Chloroflexi,and other oligotrophs.Functional predictions showed that in comparison to copiotrophs in Antarctic soils,temperate-inhabiting oligotrophic bacteria exhibited an 84.2‒91.1%lower abundance of labile C decomposition genes(hemicellulose,cellulose,monosaccharides,and disaccharides),whereas genes involved in stable C decomposition(lignin)were 74.35%higher.The genes involved in N cycling(nitrogen fixation,assimilatory nitrate reduction,and denitrification)were 24.3‒64.4%lower in temperate soils than in Antarctic soils.Collectively,our study provides a framework for describing the life strategies of soil bacteria,which are crucial to global biogeochemical cycles.
Lujie Zhang;Xue Zhao;Jieying Wang;Liyuan He;Chengjie Ren;Jun Wang;Yaoxin Guo;Ninglian Wang;Fazhu Zhao;
Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity,Northwest University,Xi'an,Shaanxi,710127 China##College of Urban and Environmental Sciences,Northwest University,Xi'an,Shaanxi,710127 China;Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity,Northwest University,Xi'an,Shaanxi,710127 China##College of Urban and Environmental Sciences,Northwest University,Xi'an,Shaanxi,710127 China;Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity,Northwest University,Xi'an,Shaanxi,710127 China##College of Urban and Environmental Sciences,Northwest University,Xi'an,Shaanxi,710127 China;Department of Biology,San Diego State University,San Diego,92182,USA;College of Agronomy,Northwest A&F University,Yangling,712100 Shaanxi,China;Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity,Northwest University,Xi'an,Shaanxi,710127 China##College of Urban and Environmental Sciences,Northwest University,Xi'an,Shaanxi,710127 China##State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling 712100,China;The College of Life Sciences,Northwest University,Xi'an,710072,Shaanxi,China;Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity,Northwest University,Xi'an,Shaanxi,710127 China##College of Urban and Environmental Sciences,Northwest University,Xi'an,Shaanxi,710127 China;Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity,Northwest University,Xi'an,Shaanxi,710127 China##College of Urban and Environmental Sciences,Northwest University,Xi'an,Shaanxi,710127 China##Shaanxi Key Laboratory for Carbon Neutral Technology,Northwest University,Xi'an,Shaanxi,710127 China;
Antarctic soil Forest soil Life strategies Soil bacterial community Soil resource conditions
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