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| Differential characteristics of soil carbon and nitrogen nutrients and microbial community in yam fields under different fertilization practices |
| Received:March 15, 2024 |
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| KeyWord:yam fertilization;humic acid;nitrate accumulation in deep soil;microbial community;co-occurrence network |
| Author Name | Affiliation | E-mail | | LI Ting | School of Water Conservancy and Environment, University of Jinan, Jinan 250022, China
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences/State Key Laboratory of Urban and Regional Ecology, Beijing 100085, China | | | GE Anhui | Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences/State Key Laboratory of Urban and Regional Ecology, Beijing 100085, China | | | SUN Zhimei | College of Resources and Environmental Science, Hebei Agricultural University, Baoding 071001, China | | | LIU Siyi | Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences/State Key Laboratory of Urban and Regional Ecology, Beijing 100085, China | | | ZHANG Limei | Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences/State Key Laboratory of Urban and Regional Ecology, Beijing 100085, China
University of Chinese of Academy of Sciences, Beijing 100049, China | | | HAN Xuemei | School of Water Conservancy and Environment, University of Jinan, Jinan 250022, China | stu_hanxm@ujn.edu.cn |
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| Abstract: |
| In this study, the physiochemical characteristics and microbial community were investigated at several soil depths（surface, 0-20 cm; subsurface, 20-40 cm; and deep layer, 40-60 cm）of yam fields under three fertilization practices（conventional fertilization, optimal fertilization, and humic acid application）, with a maize field as a reference. The results showed that：in comparison to the maize field, the yam field under conventional fertilization had significantly higher ammonium nitrogen content in the subsurface and deep layers of the soil （2.09 times and 3.03 times those in surface soil, respectively）and nitrate nitrogen content in subsurface soil（up to 50.86 mg · kg-1, calculated by dry soil）. However, optimal fertilization or humic acid treatment significantly decreased the ammonium nitrogen and nitrate nitrogen contents in the subsurface and deep layers by up to 79.55% for ammonium and 78.39% for nitrate. Compared with the maize field, yam planting under conventional fertilization significantly changed the bacterial and fungal community structure and decreased the complexity of the microbial cooccurrence network, while optimal fertilization and humic acid treatment showed no significant effect on the bacterial community. Among the three fertilization treatments in the yam field, the treatments of optimized fertilization and humic acid application possessed higher microbial network complexity and stability and significantly enriched beneficial bacteria groups such as Bacillus, Arthrobacter, Beauveria, and Glomus than under conventional fertilization treatment. These results suggest that yam plantation increases the risk of inorganic nitrogen migration into groundwater and has a significant impact on the soil microbial community composition. Optimizing fertilization and management practices for yam plantation can effectively reduce the accumulation of inorganic nitrogen in deep soils and maintain soil microbial community stability, and thus benefit the green and efficient development of the yam planting industry. |
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