Mycorrhizal fungi mitigate nitrogen losses of an experimental grassland by facilitating plant uptake and soil microbial immobilization

作     者：Yangyang JIA Marcel G.A.VAN DER HEIJDEN Alain Y.VALZANO-HELD Markus JOCHER Florian WALDER Yangyang JIA;Marcel G.A.VAN DER HEIJDEN;Alain Y.VALZANO-HELD;Markus JOCHER;Florian WALDER

作者机构：Postdoctoral Mobile Station of EcologyCollege of Ecology and EnvironmentXinjiang UniversityÜrümqi 830046China Research Group Plant-Soil InteractionsAgroscopeZürich 8046Switzerland Research Group Climate and AgricultureAgroscopeZürich 8046Switzerland Department of Plant and Microbial BiologyUniversity of ZürichZürich 8008Switzerland Research Group Soil Quality and Soil UseAgroscopeZürich 8046Switzerland 

出 版 物：《Pedosphere》 (土壤圈（英文版）)

年 卷 期：2024年第34卷第2期

页      面：399-410页

核心收录：

学科分类：07[理学] 0713[理学-生态学] 

基　　金：supported by the National Natural Science Foundation of China(Nos.32101304 and 32160281) the Key Laboratory Project,Xinjiang,China(No.2021D04006) China Postdoctoral Science Foundation(No.2021M692707) supported by the Swiss National Science Foundation(No.31003A-166079) 

主　　题：N cycling N enrichment N uptake N:P ratio plant community structure symbiotic soil fungi 

摘      要：Nitrogen(N)is one of the most limited nutrients of terrestrial ecosystems,whose losses are prevented in tightly coupled cycles in finely tuned *** change-induced N enrichment through atmospheric deposition and application of vast amounts of fertilizer are now challenging the terrestrial N *** mycorrhizal fungi(AMF)are known drivers of plant-soil nutrient fluxes,but a comprehensive assessment of AMF involvement in N cycling under global change is still ***,we simulated N enrichment by fertilization(low/high)in experimental grassland microcosms under greenhouse conditions in the presence or absence of AMF and continuously monitored different N pathways over nine *** found that high N enrichment by fertilization decreased the relative abundance of legumes and the plant species dominating the plant community changed from grasses to forbs in the presence of AMF,based on aboveground *** presence of AMF always maintained plant N:phosphorus(P)ratios between 14 and 16,no matter how the soil N availability *** in plant N:P ratios due to the increased plant N and P uptake might thus be a primary pathway of AMF altering plant community ***,we constructed a comprehensive picture of AMF’s role in N cycling,highlighting that AMF reduced N losses primarily by mitigating N leaching,while N_(2)O emissions played a marginal *** mycorrhizal fungi reduced N_(2)O emissions directly through the promotion of N_(2)O-consuming *** underlying mechanism for reducing N leaching is mainly the AMF-mediated improved nutrient uptake and AMF-associated microbial *** results indicate that synergies between AMF and other soil microorganisms cannot be ignored in N cycling and that the integral role of AMF in N cycling terrestrial ecosystems can buffer the upcoming global changes.