Pedosphere 34(2): 497--507, 2024
ISSN 1002-0160/CN 32-1315/P
©2024 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Arbuscular mycorrhizal fungi reduce ammonia emissions under different land-use types in agro-pastoral areas |
Huaisong WANG1, Rui GUO2, Yibo TIAN1, Nan CUI1, Xinxin WANG3, Lei WANG4, Zhongbao YANG5, Shuying LI6, Jixun GUO1, Lianxuan SHI1, Tao ZHANG1, |
1 Institute of Grassland Science, Northeast Normal University, Key Laboratory of Vegetation Ecology, Ministry of Education, Jilin Songnen Grassland Ecosystem National Observation and Research Station, Changchun 130024 (China);
2 Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Key Laboratory of Dryland Agriculture, Ministry of Agriculture, Beijing 100081 (China);
3 Mountainous Area Research Institute of Hebei Province, Hebei Agricultural University, Baoding 071001 (China);
4 College of Agronomy, Liaocheng University, Liaocheng 252059 (China);
5 The Key Laboratory of Plant Development and Environmental Adaptation Biology, Ministry of Education, School of Life Science, Shandong University, Qingdao 266237 (China);
6 Forestry and Grassland Bureau of Aohan Banner, Chifeng 024005 (China) |
| 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 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. |
| Key Words: agricultural intensification,grassland management,functional genes,plant N uptake,N leaching,N loss |
| Citation: Wang H S, Guo R, Tian Y B, Cui N, Wang X X, Wang L, Yang Z B, Li S Y, Guo J X, Shi L X, Zhang T. 2024. Arbuscular mycorrhizal fungi reduce ammonia emissions under different land-use types in agro-pastoral areas. Pedosphere. 34(2): 497-507. |
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