Microbial community coalescence and nitrogen cycling in simulated mortality decomposition hotspots  

作　　者：Sarah W.Keenan Alexandra L.Emmons Jennifer M.DeBruyn 

机构地区：[1]Department of Geology and Geological Engineering,South Dakota School of Mines and Technology,501 East St.Joseph Street,Rapid,SD 57701,USA [2]Department of Anthropology,University of Tennessee,Knoxville,TN,USA [3]Department of Biosystems Engineering and Soil Science,University of Tennessee,2506 E.J.Chapman Drive,Knoxville,TN 37996,USA

出　　处：《Ecological Processes》2023年第1期608-624,共17页生态过程（英文）

基　　金：Funding for this research was provided by the National Science Foundation(Award 1549726)to JMD;Funding for open access to this research was provided by the University of Tennessee Open Publishing Support Fund.

摘　　要：Background The pulsed introduction of dead plant and animal material into soils represents one of the primary mechanisms for returning organic carbon(C)and nitrogen(N)compounds to biogeochemical cycles.Decomposition of animal carcasses provides a high C and N resource that stimulates indigenous environmental microbial communities and introduces non-indigenous,carcass-derived microbes to the environment.However,the dynamics of the coalesced microbial communities,and the relative contributions of environment-and carcass-derived microbes to C and N cycling are unknown.To test whether environment-derived,carcass-derived,or the combined microbial communities exhibited a greater influence on C and N cycling,we conducted controlled laboratory experiments that combined carcass decomposition fluids and soils to simulate carcass decomposition hotspots.We selectively sterilized the decomposition fluid and/or soil to remove microbial communities and create different combinations of environment-and carcass-derived communities and incubated the treatments under three temperatures(10,20,and 30℃).Results Carcass-derived bacteria persisted in soils in our simulated decomposition scenarios,albeit at low abundances.Mixed communities had higher respiration rates at 10 and 30℃ compared to soil or carcass communities alone.Interestingly,at higher temperatures,mixed communities had reduced diversity,but higher respiration,suggesting functional redundancy.Mixed communities treatments also provided evidence that carcass-associated microbes may be contributing to ammonification and denitrification,but that nitrification is still primarily carried out by native soil organisms.Conclusions Our work yields insight into the dynamics of microbial communities that are coalescing during carcass decomposition,and how they contribute to recycling carcasses in terrestrial ecosystems.

关 键 词：Carcass decomposition MICROCOSM Nitrogen Carbon Biogeochemical cycling COALESCENCE 

分 类 号：P593[天文地球—地球化学]