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Liu Z, Yin X, Xiao N, Wan X, Hu J, Hua Y, Liu G, Zhao J. Organic acids released by submerged macrophytes with damaged leaves alter the denitrification microbial community in rhizosphere. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 946:174059. [PMID: 38906286 DOI: 10.1016/j.scitotenv.2024.174059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2024] [Revised: 05/30/2024] [Accepted: 06/14/2024] [Indexed: 06/23/2024]
Abstract
Submerged macrophytes have important impacts on the denitrification and anaerobic ammonia-oxidizing (anammox) processes. Leaf damage in these plants probably changes the rhizosphere environment, affecting organic acid release and denitrifying bacteria. However, there is a lack of comprehensive understanding of the specific changes. This study investigated these changes in the rhizosphere of Potamogeton crispus with four degrees of leaf excision. When 0 %, 30 %, 50 % and 70 % of leaves were excised, the concentrations of total organic acid were 31.45, 32.67, 38.26, and 35.16 mg/L, respectively. The abundances of nirS-type denitrifying bacteria were 2.10 × 1010, 1.59 × 1010, 2.54 × 1010, and 4.67 × 1010 copies/g dry sediment, respectively. The abundances of anammox bacteria were 7.58 × 109, 4.59 × 109, 3.81 × 109, and 3.90 × 109 copies/g dry sediment, respectively. The concentration of total organic acids and the abundance of two denitrification microorganisms in the rhizosphere zone were higher than those in the root zone and non-rhizosphere zone. With increasing leaf damage, the number of OTUs in the Pseudomonas genus of nirS-type denitrifying bacteria first increased and then decreased, while that of the Thauera genus was relatively stable. The overall increase in the OTU number of anammox bacteria indicated that leaf damage promotes root exudates release, thereby leading to an increase in their diversity. The co-occurrence network revealed that the two denitrification microorganisms had about 60.52 % positive connections in rhizosphere while 64.73 % negative connections in non-rhizosphere. The abundance and community composition of both denitrification microorganisms were positively correlated with the concentrations of various substances such as oxalic acid, succinic acid, total organic acids and NO2--N. These findings demonstrate that submerged plant damage has significantly impacts on the structure of denitrification microbial community in the rhizosphere, which may alter the nitrogen cycling process in the deposit sediment. SYNOPSIS: This study reveals leaf damage of macrophyte changed the rhizosphere denitrification microbial community, which is helpful to further understand the process of nitrogen cycle in water.
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Affiliation(s)
- Ziqi Liu
- Laboratory of Eco-Environmental Engineering Research, State Environmental Protection Key Laboratory of Soil Health and Green Remediation, Huazhong Agricultural University, Wuhan 430070, China
| | - Xingjia Yin
- Key Laboratory for Quality Control of Characteristic Fruits and Vegetables of Hubei Province, College of Life Science and Technology, Hubei Engineering University, Xiaogan 432000, China
| | - Naidong Xiao
- Laboratory of Eco-Environmental Engineering Research, State Environmental Protection Key Laboratory of Soil Health and Green Remediation, Huazhong Agricultural University, Wuhan 430070, China
| | - Xiaoqiong Wan
- Laboratory of Eco-Environmental Engineering Research, State Environmental Protection Key Laboratory of Soil Health and Green Remediation, Huazhong Agricultural University, Wuhan 430070, China
| | - Jinlong Hu
- Laboratory of Eco-Environmental Engineering Research, State Environmental Protection Key Laboratory of Soil Health and Green Remediation, Huazhong Agricultural University, Wuhan 430070, China
| | - Yumei Hua
- Laboratory of Eco-Environmental Engineering Research, State Environmental Protection Key Laboratory of Soil Health and Green Remediation, Huazhong Agricultural University, Wuhan 430070, China
| | - Guanglong Liu
- Laboratory of Eco-Environmental Engineering Research, State Environmental Protection Key Laboratory of Soil Health and Green Remediation, Huazhong Agricultural University, Wuhan 430070, China
| | - Jianwei Zhao
- Laboratory of Eco-Environmental Engineering Research, State Environmental Protection Key Laboratory of Soil Health and Green Remediation, Huazhong Agricultural University, Wuhan 430070, China.
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Cheng H, Yang Y, Shen L, Liu Y, Zhan X, Hu Z, Huang H, Jin J, Ren B, He Y, Jin Y, Su Z. Spatial variations of activity and community structure of nitrite-dependent anaerobic methanotrophs in river sediment. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 851:158288. [PMID: 36030855 DOI: 10.1016/j.scitotenv.2022.158288] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 08/19/2022] [Accepted: 08/22/2022] [Indexed: 06/15/2023]
Abstract
Rivers are an important site for methane emissions and reactive nitrogen removal. The process of nitrite-dependent anaerobic methane oxidation (n-damo) links the global carbon cycle and the nitrogen cycle, but its role in methane mitigation and nitrogen removal in rivers is poorly known. In the present study, we investigated the activity, abundance, and community composition of n-damo bacteria in sediment of the upper, middle, and lower reaches of Wuxijiang River (Zhejiang Province, China). The 13CH4 stable isotope experiments showed that the methane oxidation activity of n-damo was 0.11-1.88 nmol CO2 g-1 (dry sediment) d-1, and the activity measured from the middle reaches was significantly higher than that from the remaining regions. It was estimated that 3.27 g CH4 m-2 year-1 and 8.72 g N m-2 year-1 could be consumed via n-damo. Quantitative PCR confirmed the presence of n-damo bacteria, and their 16S rRNA gene abundance varied between 5.45 × 105 and 5.86 × 106 copies g-1 dry sediment. Similarly, the abundance of n-damo bacteria was significantly higher in the middle reaches. High-throughput sequencing showed a high n-damo bacterial diversity, with totally 152 operational taxonomic units being detected at 97 % sequence similarity cut-off. In addition, the n-damo bacterial community composition also varied spatially. The inorganic nitrogen (NH4+, NO2-, NO3-) level was found to be the key environmental factor controlling the n-damo activity and bacterial community composition. Overall, our results showed the spatial variations and environmental regulation of the activity and community structure of n-damo bacteria in river sediment, which expanded our understanding of the quantitative importance of n-damo in both methane oxidation and reactive nitrogen removal in riverine systems.
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Affiliation(s)
- Haixiang Cheng
- College of Chemistry and Materials Engineering, Quzhou University, Quzhou 324000, China
| | - Yuling Yang
- Jiangsu Key Laboratory of Agricultural Meteorology, School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China
| | - Lidong Shen
- Jiangsu Key Laboratory of Agricultural Meteorology, School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China.
| | - Yan Liu
- Wuxi River Drinking Water Source Protection and Management Center, Quzhou 324000, China
| | - Xugang Zhan
- Quzhou Bureau of Ecology and Environment, Quzhou 324000, China
| | - Zhengfeng Hu
- Eco-environmental Science Research & Design Institute of Zhejiang Province, Hangzhou 310007, China
| | - Hechen Huang
- Jiangsu Key Laboratory of Agricultural Meteorology, School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China
| | - Jinghao Jin
- Jiangsu Key Laboratory of Agricultural Meteorology, School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China
| | - Bingjie Ren
- Jiangsu Key Laboratory of Agricultural Meteorology, School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China
| | - Yefan He
- Jiangsu Key Laboratory of Agricultural Meteorology, School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China
| | - Yuhan Jin
- Jiangsu Key Laboratory of Agricultural Meteorology, School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China
| | - Zhenfa Su
- Jiangsu Key Laboratory of Agricultural Meteorology, School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China
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Hu J, Ke X, Wang B, Mei Y, Xiao N, Wan X, Liu G, Hu M, Zhao J. SSThe coexistence and diversity of Candidatus methylomirabilis oxyfera-like and anammox bacteria in sediments of an urban eutrophic lake. Int Microbiol 2022; 25:457-469. [DOI: 10.1007/s10123-021-00230-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Revised: 12/03/2021] [Accepted: 12/17/2021] [Indexed: 11/28/2022]
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Xu Y, Lu J, Huang S, Zhao J. Submerged plants alleviated the impacts of increased ammonium pollution on anammox bacteria and nirS denitrifiers in the rhizosphere. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:58755-58767. [PMID: 34120278 DOI: 10.1007/s11356-021-14715-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Accepted: 05/31/2021] [Indexed: 06/12/2023]
Abstract
Excess nitrogen input into water bodies can cause eutrophication and affect the community structure and abundance of the nitrogen-transforming microorganisms; thus, it is essential to remove nitrogen from eutrophic water bodies. Aquatic plants can facilitate the growth of rhizosphere microorganisms. This study investigated the impact of ammonium pollution on the anammox and denitrifying bacteria in the rhizosphere of a cultivated submerged macrophyte, Potamogeton crispus (P. crispus) by adding three different concentrations of slow-release urea (0, 400, 600 mg per kg sediment) to the sediment to simulate different levels of nitrogen pollution in the lake. Results showed that the ammonium concentrations in the interstitial water under three pollution treatments were significantly different, but the nitrate concentration remained stable. The abundance of anammox 16S rRNA and nitrite reductase (nirS) gene in rhizosphere sediments exhibited no significant differences under the three pollution conditions. The increase in the nitrogen pollution levels did not significantly affect the growth of anammox bacteria and nirS denitrifying bacteria (denitrifiers). The change trend of the abundance ratio of (anammox 16S rRNA)/nirS in different nitrogen treatment groups on the same sampling date was very close, indicating that this ratio was not affected by ammonium pollution levels when P. crispus existed. The redundancy analysis showed that there was a positive correlation between the abundance of anammox 16S rRNA and nirS gene and that the abundance of these bacteria was significantly affected by the mole ratio of NH4+/NO3-. This study reveals that submerged plants weaken the environmental changes caused by ammonia pollution in the rhizosphere, thereby avoiding strong fluctuation of anammox bacteria and nirS denitrifiers.
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Affiliation(s)
- Yangfan Xu
- Research and Development Center of Transport Industry of Intelligent Manufacturing Technologies of Transport Infrastructure, Wuhan, 430040, China
- Key Laboratory of Large-span Bridge Construction Technology, Wuhan, 430040, China
- CCCC Second Harbor Engineering Company Ltd., Wuhan, 430040, China
| | - Jing Lu
- Australian Rivers Institute, Griffith University, QLD, Nathan, 4111, Australia
| | - Shanshan Huang
- Laboratory of Eco-Environmental Engineering Research, Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture, Huazhong Agricultural University, No.1, Shizishan Street, Hongshan District, Wuhan, 430070, Hubei Province, China
| | - Jianwei Zhao
- Laboratory of Eco-Environmental Engineering Research, Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture, Huazhong Agricultural University, No.1, Shizishan Street, Hongshan District, Wuhan, 430070, Hubei Province, China.
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Xiao Y, Yin X, Chen L, Wang J, Wang Y, Liu G, Hua Y, Wan X, Xiao N, Zhao J, Zhu D. Effects of illumination on nirS denitrifying and anammox bacteria in the rhizosphere of submerged macrophytes. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 760:143420. [PMID: 33189380 DOI: 10.1016/j.scitotenv.2020.143420] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Revised: 10/08/2020] [Accepted: 10/26/2020] [Indexed: 06/11/2023]
Abstract
Visibility in lakes can decrease due to increases in the amounts of suspended solids and algae, which inhibits the growth of submerged macrophytes. However, the understanding about whether illumination reduction affects the nitrogen-cycling microorganisms in the rhizosphere of submerged macrophytes, is limited. The abundance and biodiversity of nirS denitrifying and anammox bacteria in the rhizosphere of Potamogeton crispus were studied under 0% (natural light), 20%, 40%, and 60% shading treatments. The abundance of the nirS gene was highest under 60% shading treatment, while the anammox 16S rRNA gene was highest under 40% shading treatment. Moreover, the abundance of the two genes were lower under natural light than under shading conditions during most sampling periods. The quantitative ratio of the two gene (anammox 16S rRNA to nirS gene) abundance fluctuated wildly with the distance away from the roots, under natural light and 20% shading treatment. However, the ratio varied relatively little under 40% and 60% shading treatments. The diversity of nirS denitrifying bacteria was high in the rhizosphere, while the diversity of anammox bacteria was low, and Candidatus Brocadia fulgida was dominant. This study revealed that illumination reduction not only facilitated the growth of nirS denitrifying and anammox bacteria in the rhizosphere, but also weakened the competition between the two bacteria.
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Affiliation(s)
- Yang Xiao
- Laboratory of Eco-Environmental Engineering Research, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
| | - Xingjia Yin
- Laboratory of Eco-Environmental Engineering Research, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China; Key Laboratory for Quality Control of Characteristic Fruits and Vegetables of Hubei Province, College of Life Science and Technology, Hubei Engineering University, Xiaogan 432000, China
| | - Lijuan Chen
- Key Laboratory of Ecohydrology of Inland River Basin, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Jing Wang
- Laboratory of Eco-Environmental Engineering Research, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
| | - Yuchun Wang
- Department of Water Environment, China Institute of Water Resources and Hydropower Research, Beijing 100038, China; State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, Institute of Water Resources and China Hydropower Research, Beijing 100038, China.
| | - Guanglong Liu
- Laboratory of Eco-Environmental Engineering Research, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
| | - Yumei Hua
- Laboratory of Eco-Environmental Engineering Research, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
| | - Xiaoqiong Wan
- Laboratory of Eco-Environmental Engineering Research, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
| | - Naidong Xiao
- Laboratory of Eco-Environmental Engineering Research, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
| | - Jianwei Zhao
- Laboratory of Eco-Environmental Engineering Research, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China.
| | - Duanwei Zhu
- Laboratory of Eco-Environmental Engineering Research, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
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Hu J, Zhou Y, Lei Z, Liu G, Hua Y, Zhou W, Wan X, Zhu D, Zhao J. Effects of Potamogeton crispus decline in the rhizosphere on the abundance of anammox bacteria and nirS denitrifying bacteria ☆. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 260:114018. [PMID: 31991343 DOI: 10.1016/j.envpol.2020.114018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Revised: 01/17/2020] [Accepted: 01/17/2020] [Indexed: 05/23/2023]
Abstract
Bacteria involved with ecosystem N cycling in the rhizosphere of submerged macrophytes are abundant and diverse. Any declines of submerged macrophytes can have a great influence on the abundance and diversity of denitrifying bacteria and anammox bacteria. Natural decline, tardy decline, and sudden decline methods were applied to cultivated Potamogeton crispus. The abundance of anammox bacteria and nirS denitrifying bacteria in rhizosphere sediment were detected using real-time fluorescent quantitative PCR of 16S rRNA, and phylogenetic trees were constructed to analyze the diversities of these two microbes. The results indicated that the concentration of NH4+ in pore water gradually increased with increasing distances from the roots, whereas, the concentration of NO3- showed a reverse trend. The abundance of anammox bacteria and nirS denitrifying bacteria in sediment of declined P. crispus populations decreased significantly over time. The abundance of these two microbes in the sudden decline group were significantly higher (P > 0.05) than the other decline treatment groups. Furthermore, the abundances of these two microbes were positively correlated, with RDA analyses finding the mole ratio of NH4+/NO3- being the most important positive factor affecting microbe abundance. Phylogenetic analysis indicated that the anammox bacteria Brocadia fuigida and Scalindua wagneri, and nirS denitrifying bacteria Herbaspirillum and Pseudomonas, were the dominant species in declined P. crispus sediment. We suggest the sudden decline of submerged macrophytes would increase the abundance of anammox bacteria and denitrifying bacteria in a relatively short time.
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Affiliation(s)
- Jinlong Hu
- Laboratory of Eco-Environmental Engineering Research, College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China
| | - Yuhao Zhou
- Laboratory of Eco-Environmental Engineering Research, College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China
| | - Ziyan Lei
- Laboratory of Eco-Environmental Engineering Research, College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China
| | - Guanglong Liu
- Laboratory of Eco-Environmental Engineering Research, College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China
| | - Yumei Hua
- Laboratory of Eco-Environmental Engineering Research, College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China
| | - Wenbing Zhou
- Laboratory of Eco-Environmental Engineering Research, College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China
| | - Xiaoqiong Wan
- Laboratory of Eco-Environmental Engineering Research, College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China
| | - Duanwei Zhu
- Laboratory of Eco-Environmental Engineering Research, College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China
| | - Jianwei Zhao
- Laboratory of Eco-Environmental Engineering Research, College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China.
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Yin X, Lu J, Wang Y, Liu G, Hua Y, Wan X, Zhao J, Zhu D. The abundance of nirS-type denitrifiers and anammox bacteria in rhizospheres was affected by the organic acids secreted from roots of submerged macrophytes. CHEMOSPHERE 2020; 240:124903. [PMID: 31563100 DOI: 10.1016/j.chemosphere.2019.124903] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Revised: 09/17/2019] [Accepted: 09/17/2019] [Indexed: 06/10/2023]
Abstract
Excessive nitrogen has been a global concern to cause lake eutrophication. The denitrification and anammox processes are considered to be effective biological pathways for nitrogen removal. Submerged macrophytes also play a key role in the nitrogen cycle of lakes. However, the mechanism of submerged macrophytes on regulating biological nitrogen removal pathways has not been well quantified. Therefore, this study investigated the impacts of submerged macrophytes on the community structures and abundance of the nirS-type denitrifiers and anammox bacteria in the rhizospheres. The qPCR results indicated that the abundance of two bacteria in the near-rhizospheres of submerged macrophytes was significantly lower than the root compartments and non-rhizospheres, while the concentrations of organic acids in the near-rhizospheres were higher than those of the root compartments and non-rhizospheres. Redundancy analysis results illustrated that concentrations of NO3--N, NO2--N, citric acid and oxalic acid were the key environmental indicators which had the significant impact on the microbial community. The concentrations of citric acid and oxalic acid were negatively correlated with the nirS-type denitrifiers abundance, and the oxalic acid concentrations were negatively correlated with the anammox bacteria abundance. These results indicated that submerged macrophytes could reduce the abundance of nirS-type denitrifiers and anammox bacteria by releasing organic acids. In addition, the highest diversity of denitrifier community were found in the rhizosphere of the Hydrilla verticillata, while the highest diversity of anammox community were found in the Potamogeton maackianus rhizosphere. These results indicate that the impacts of submerged macrophytes on the biological nitrogen removal pathways were species-dependent.
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Affiliation(s)
- Xingjia Yin
- Laboratory of Eco-Environmental Engineering Research of Huazhong Agricultural University, Wuhan, 430070, China; Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture, Wuhan, 430070, China
| | - Jing Lu
- Australian Rivers Institute, Griffith University, Nathan, QLD, 4111, Australia
| | - Yuchun Wang
- State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, Beijing, 10038, China; Department of Water Environment, China Institute of Water Resources and Hydropower Research, Beijing, 10038, China
| | - Guanglong Liu
- Laboratory of Eco-Environmental Engineering Research of Huazhong Agricultural University, Wuhan, 430070, China; Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture, Wuhan, 430070, China
| | - Yumei Hua
- Laboratory of Eco-Environmental Engineering Research of Huazhong Agricultural University, Wuhan, 430070, China; Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture, Wuhan, 430070, China
| | - Xiaoqiong Wan
- Laboratory of Eco-Environmental Engineering Research of Huazhong Agricultural University, Wuhan, 430070, China; Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture, Wuhan, 430070, China
| | - Jianwei Zhao
- Laboratory of Eco-Environmental Engineering Research of Huazhong Agricultural University, Wuhan, 430070, China; Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture, Wuhan, 430070, China.
| | - Duanwei Zhu
- Laboratory of Eco-Environmental Engineering Research of Huazhong Agricultural University, Wuhan, 430070, China; Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture, Wuhan, 430070, China
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