Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 26, Issue 27, Pages 27987-27998Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-019-06005-0
Keywords
Nitrogen; Arbuscular mycorrhiza; Splash erosion; Aggregate stability; Rice; Fertilization
Categories
Funding
- Natural Science Foundation of Jiangsu Province [BK20160689]
- National Key Technologies R&D Program of China [2015BAL02B05]
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Arbuscular mycorrhizal (AM) fungi were of importance in mitigating soil erosion, which was highly influenced by biotic and abiotic factors, such as host plant growth and soil nutrient. To investigate the impact of nitrogen (N) fertilization on seasonal variance in AM colonization and soil erosion, we conducted a field experiment with rice cultivation under four N fertilizer levels (0 kg N ha(-1), 270 kg N ha(-1), 300 kg N ha(-1), and 375 kg N ha(-1) plus organic fertilizers) in the Taihu Lake region, China. We investigated AM colonization before rice transplantation, during rice growth, and after rice harvest. We also assessed soil splash erosion of intact soil cores sampled at tillering and after rice harvest. We found that AM colonization (indicated by percentage of root length colonization) varied from 15 to 73%, which was attributed to rice growth, N fertilization, and their interaction. Soil loss due to splash erosion was cut down by organic N fertilizer at tillering, while higher inorganic N fertilization significantly increased soil loss after rice harvest. Additionally, we found significantly negative relationships of AM colonization to soil loss but positive relationships to soil aggregate stability. We highlighted the potential role of AM fungi in decreasing soil erosion and suggested that high N fertilization should be considered carefully when seeking after high yields.
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