Abstract
Ammonia(NH3)emissions,the most important nitrogen(N)loss form,always induce a series of environmental problems such as increased frequency of regional haze pollution,accelerated N deposition,and N eutrophication.Arbuscular mycorrhizal(AM)fungi play key roles in N cycling.However,it is still unclear whether AM fungi can alleviate N losses by reducing NH3 emissions.The potential mechanisms by which AM fungi reduce NH3 emissions in five land-use types(grazed grassland,mowed grassland,fenced grassland,artificial alfalfa grassland,and cropland)were explored in this study.Results showed that AM fungal inoculation significantly reduced NH3 emissions,and the mycorrhizal responses of NH3 emissions were determined by land-use type.Structural equation modeling(SEM)showed that AM fungi and land-use type directly affected NH3 emissions.In addition,the reduction in NH3 emissions was largely driven by the decline in soil NH4-N and pH and the increases in abundances of ammonia-oxidizing archaea(AOA)amoA and bacteria(AOB)amoB genes,urease activity,and plant N uptake induced by AM fungal inoculation and land-use type.The present results highlight that reducing the negative influence of agricultural intensification caused by land-use type changes on AM fungi should be considered to reduce N losses in agriculture and grassland ecosystems.
基金项目
国家自然科学基金(32171645)
国家自然科学基金(31770359)
Foundation of Science and Technology Commission of Jilin Province,China(20200201115JC)
中央高校基本科研业务费专项(2412020ZD010)
NETL
NSTL
万方数据