Arbuscular mycorrhizal fungi reduce ammonia emissions under different land-use types in agro-pastoral areas

文献类型： 外文期刊

第一作者： Wang, Huaisong

作者： Wang, Huaisong;Tian, Yibo;Cui, Nan;Guo, Jixun;Shi, Lianxuan;Zhang, Tao;Guo, Rui;Wang, Xinxin;Wang, Lei;Yang, Zhongbao;Li, Shuying

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关键词： agricultural intensification; grassland management; functional genes; plant N uptake; N leaching; N loss

期刊名称：PEDOSPHERE （ 影响因子：5.7； 五年影响因子：5.7 ）

ISSN： 1002-0160

年卷期： 2024 年 34 卷 2 期

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收录情况： SCI

摘要： 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 NH+4 -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.

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