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Chen C, Gong H, Wei Y, Xu T, Li J, Ding GC. Promoting agricultural waste-driven denitrification and nitrogen sequestration with nano-enabled strategy. BIORESOURCE TECHNOLOGY 2024; 401:130746. [PMID: 38679240 DOI: 10.1016/j.biortech.2024.130746] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Revised: 04/25/2024] [Accepted: 04/25/2024] [Indexed: 05/01/2024]
Abstract
Nanotechnology and biotechnology offer promising avenues for bolstering food security through the facilitation of soil nitrogen (N) sequestration and the reduction of nitrate leaching. Nonetheless, a comprehensive and mechanistic evaluation of their effectiveness and safety remains unclear. In this study, a soil remediation strategy employing nano-Fe3O4 and straw in N-contaminated soil was developed to elucidate N retention mechanisms via diverse metagenomics techniques. The findings revealed that subsoil amended with straw, particularly in conjunction with nano-Fe3O4, significantly increased subsoil N content (53.2%) and decreased nitrate concentration (74.6%) in leachate. Furthermore, the enrichment of functional genes associated with N-cycling, sulfate, nitrate, and iron uptake, along with chemotaxis, and responses to environmental stimuli or microbial collaboration, effectively mitigates nitrate leaching while enhancing soil N sequestration. This study introduces a pioneering approach utilizing nanomaterials in soil remediation, thereby offering the potential for the cultivation of safe vegetables in high N input greenhouse agriculture.
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Affiliation(s)
- Chen Chen
- College of Resources and Environmental Science, State Key Laboratory of Nutrient Use and Management, China Agricultural University, Beijing 100193, China; National Observation and Research Station for Yangtze Estuarine Wetland Ecosystems, and Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Institute of Biodiversity Science, School of Life Sciences, Fudan University, Shanghai 200433, China
| | - Haiqing Gong
- College of Resources and Environmental Science, State Key Laboratory of Nutrient Use and Management, China Agricultural University, Beijing 100193, China
| | - Yuquan Wei
- College of Resources and Environmental Science, State Key Laboratory of Nutrient Use and Management, China Agricultural University, Beijing 100193, China; Organic Recycling Institute (Suzhou) of China Agricultural University, Wuzhong District, Jiangsu Province 215128, China
| | - Ting Xu
- College of Resources and Environmental Science, State Key Laboratory of Nutrient Use and Management, China Agricultural University, Beijing 100193, China; Organic Recycling Institute (Suzhou) of China Agricultural University, Wuzhong District, Jiangsu Province 215128, China
| | - Ji Li
- College of Resources and Environmental Science, State Key Laboratory of Nutrient Use and Management, China Agricultural University, Beijing 100193, China; Organic Recycling Institute (Suzhou) of China Agricultural University, Wuzhong District, Jiangsu Province 215128, China
| | - Guo-Chun Ding
- College of Resources and Environmental Science, State Key Laboratory of Nutrient Use and Management, China Agricultural University, Beijing 100193, China; Organic Recycling Institute (Suzhou) of China Agricultural University, Wuzhong District, Jiangsu Province 215128, China.
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Gong J, Liu B, Liu P, Zhang L, Chen C, Wei Y, Li J, Ding GC. Changes in bacterial diversity, co-occurrence pattern, and potential pathogens following digestate fertilization: Extending pathogen management to field for anaerobic digestion of livestock manure. WASTE MANAGEMENT (NEW YORK, N.Y.) 2023; 158:107-115. [PMID: 36652821 DOI: 10.1016/j.wasman.2023.01.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Revised: 12/01/2022] [Accepted: 01/10/2023] [Indexed: 06/17/2023]
Abstract
Digestate can spread pathogens into agroecosystem, posing serious threats to public health. However, the effect of digestate fertilization on digestate- or soil-borne pathogens has not been fully explored. Herein, two settings of microcosm experiment were performed with arable soil and digestate collected at two sites (Beilangzhong or Shunyi) to dissect the succession of the total and potential pathogenic bacterial communities following digestate fertilization. Each experimental setting consisted of three treatments, including digestate aerobically incubated in sterilized soil, and soil amended with sterilized or non-sterilized digestate. Digestate-borne potential pathogenic bacteria were enriched after the aerobic incubation, with Streptococcus sobrinus in the Beilangzhong setting, and Escherichia coli and Enterococcus faecium in the Shunyi setting. Potential soil-borne pathogenic bacteria, such as Acinetobacter lowffii and Pseudomonas fluorescens, were stimulated by the sterilized digestate in the Shunyi setting. Interestingly, S. sobrinus, E. coli, and Ent. faecium did not increase when digestate was amended into the non-sterilized soil, suggesting that soil microorganisms can inhibit the resurgence of these digestate-borne pathogens. A large-scale survey further revealed that organic fertilization exerted a site-dependent effect on different species of potential pathogen, but it did not enrich the total relative abundance of potential pathogenic bacteria in soils. Collectively, these results highlight that pathogen management of anaerobic digestion of livestock manure needs to be extended from anaerobic reactor to field.
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Affiliation(s)
- Jingyang Gong
- College of Resources and Environmental Science, Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, Beijing, China; Xinyang Agriculture and Forestry University, Xinyang, China
| | - Baojun Liu
- College of Resources and Environmental Science, Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, Beijing, China; Organic Recycling Institute (Suzhou) of China Agricultural University, Wuzhong District, 215128 Jiangsu Province, China
| | - Pingping Liu
- College of Resources and Environmental Science, Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, Beijing, China; Organic Recycling Institute (Suzhou) of China Agricultural University, Wuzhong District, 215128 Jiangsu Province, China
| | - Lina Zhang
- Jiangsu Coastal Area Institute of Agricultural Science, Yancheng, China
| | - Chen Chen
- College of Resources and Environmental Science, Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, Beijing, China
| | - Yuquan Wei
- College of Resources and Environmental Science, Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, Beijing, China; Organic Recycling Institute (Suzhou) of China Agricultural University, Wuzhong District, 215128 Jiangsu Province, China
| | - Ji Li
- College of Resources and Environmental Science, Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, Beijing, China; Organic Recycling Institute (Suzhou) of China Agricultural University, Wuzhong District, 215128 Jiangsu Province, China
| | - Guo-Chun Ding
- College of Resources and Environmental Science, Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, Beijing, China; Organic Recycling Institute (Suzhou) of China Agricultural University, Wuzhong District, 215128 Jiangsu Province, China.
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Total and denitrifying bacterial communities associated with the interception of nitrate leaching by carbon amendment in the subsoil. Appl Microbiol Biotechnol 2021; 105:2559-2572. [PMID: 33651129 DOI: 10.1007/s00253-021-11189-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2020] [Revised: 01/30/2021] [Accepted: 02/17/2021] [Indexed: 10/22/2022]
Abstract
Nitrate leaching is severe in greenhouse where excessive nitrogen is often applied to maintain high crop productivities. In this study, we investigated the effects of carbon amendment in the subsoil on nitrate leaching and the emission of greenhouse gases (CH4 and N2O) using a soil column experiment. Carbon amendment resulted in over 39% reduction in nitrate leaching and 25.3% to 60.6% increase of total N content in the subsoil zone as compared to non-amended control. Strikingly, the abundance of nirS, nosZ, and 16S rRNA were higher in the treatment than the corresponding controls while no significant effect was detected for nirK. Carbon amendment explained 14%, 10%, and 4% of the variation in the community of nosZ, nirS, and nirK, respectively. It also considerably (more than 7 times) enriched genera such as Anaerovorax, Pseudobacteroides, Magnetospirillum, Prolixibacter, Sporobacter, Ignavibacterium, Syntrophobacter, Oxobacter, Hydrogenispora, Desulfosporomusa, Mangrovibacterium, and Sporomusa, as revealed by the analysis of 16S rRNA amplicon. Network analysis further uncovered that carbon amendment enriched three microbial hubs which mainly consists of positively correlated nirS, nosZ, and anaerobic bacterial populations. In summary, carbon amendment in the subsoil mitigated nitrate leaching and increased the nitrogen pool by possible activation of denitrifying and anaerobic bacterial populations. KEY POINTS: • Carbon amendment in subsoil reduced NO3- leaching by over 39% under high N input. • Carbon amendment increased the total N in subsoil from 25.3% to 60.6%. • Carbon amendment enriched nirS- and nosZ-type denitrifying bacteria in subsoil.
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