Influence Of AM Fungi On Plant And Soil C:N:P Stoichiometry In Songnen Grassland Under Warming And Nitrogen Addition Condition

Ecological stoichiometry has been being one of the most important hotspots of ecology research in recent years,which can link the belowground cyclings of carbon(C),nitrogen(N)and phosphorus(P)with aboveground cyclings of C,N and P.Arbuscular mycorrhizal fungi(AMF)are the most influential members of the soil microbiota,which can form common mycorrhizal network underground and transfer nutrients among different plant species.However,the development of AMF is often influenced by warming and N addition,thus,which can alter the effect of AMF on nutrient transfer between plant and soil.Up to now,the effect of AMF on plant and soil C,N and P stoichiometry is still not clear.The object of this study was to understand the influence of AMF on plant and soil C,N and P stoichiometry under warming and N addition condition.The result will help us understand the potential role of AMF on C,N and P turnover between plant and soil under climate change,and then evaluate the influence of AMF on ecosystem C,N and P cyclings under future climate change.The main results were as follows:(1)Nitrogen addition,warming,warming plus N addition all decreased soil total carbon content,but increased soil total N content.N addition,warming plus N addition significantly decreased soil total P content,warming increased P content.Under warming plus N addition,AMF significantly altered soil total N content,but no impact on soil total C and P contents.(2)The response of plant C,N and P to warming and N addition varied.Warming and N addition did not affect plant total C contents of Chloris virgate,Setaria viridis and Leymus chinensis.Warming and warming plus N addition significantly increased plant C content of Suaeda corniculata.Warming plus N addition increased plant C content of Lespedeza davurica.N addition significantly increased plant C contents of C.virgate,S.viridis and S.corniculata.Warming significantly decreased the N contents of C.virgate,L.chinensis and L.davuric.Warming plus N addition increased C.virgate,S.viridis and L.s chinensi.(3)AMF significantly affected soil total N content,plant N contents of S.corniculata and L.chinensis and P content of S.corniculata under warming and N addition conditions.In summary,warming and N addition significantly affected plant and soil nutrients,but AMF can significantly influence the effect of warming and N addition on plant and soil C,N and P stoichiometry.The result can help us understand the potential role of AMF on nutrients turnover between plant and soil under future climate.