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Dlamini JC, Tesfamariam EH, Verbeeck M, Loick N, Louro‐Lopez A, Hawkins JMB, Blackwell MSA, Dunn RM, Collins AL, Cardenas LM. Do NO, N 2O, N 2 and CO 2 fluxes differ in soils sourced from cropland and varying riparian buffer vegetation? An incubation study. SOIL USE AND MANAGEMENT 2024; 40:e12951. [PMID: 38516181 PMCID: PMC10952594 DOI: 10.1111/sum.12951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Revised: 07/21/2023] [Accepted: 07/22/2023] [Indexed: 03/23/2024]
Abstract
Riparian buffers are expedient interventions for water quality functions in agricultural landscapes. However, the choice of vegetation and management affects soil microbial communities, which in turn affect nutrient cycling and the production and emission of gases such as nitric oxide (NO), nitrous oxide (N2O), nitrogen gas (N2) and carbon dioxide (CO2). To investigate the potential fluxes of the above-mentioned gases, soil samples were collected from a cropland and downslope grass, willow and woodland riparian buffers from a replicated plot scale experimental facility. The soils were re-packed into cores and to investigate their potential to produce the aforementioned gases via potential denitrification, a potassium nitrate (KNO3 -) and glucose (labile carbon)-containing amendment, was added prior to incubation in a specialized laboratory DENItrification System (DENIS). The resulting NO, N2O, N2 and CO2 emissions were measured simultaneously, with the most NO (2.9 ± 0.31 mg NO m-2) and N2O (1413.4 ± 448.3 mg N2O m-2) generated by the grass riparian buffer and the most N2 (698.1 ± 270.3 mg N2 m-2) and CO2 (27,558.3 ± 128.9 mg CO2 m-2) produced by the willow riparian buffer. Thus, the results show that grass riparian buffer soils have a greater NO3 - removal capacity, evidenced by their large potential denitrification rates, while the willow riparian buffers may be an effective riparian buffer as its soils potentially promote complete denitrification to N2, especially in areas with similar conditions to the current study.
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Affiliation(s)
- J. C. Dlamini
- Department of Soil, Crop and Climate SciencesUniversity of the Free StateBloemfonteinSouth Africa
- Sustainable Agriculture Sciences, Rothamsted ResearchOkehamptonUK
- Department of Plant and Soil SciencesUniversity of PretoriaHatfieldSouth Africa
| | - E. H. Tesfamariam
- Department of Plant and Soil SciencesUniversity of PretoriaHatfieldSouth Africa
| | - M. Verbeeck
- Sustainable Agriculture Sciences, Rothamsted ResearchOkehamptonUK
| | - N. Loick
- Sustainable Agriculture Sciences, Rothamsted ResearchOkehamptonUK
| | - A. Louro‐Lopez
- Sustainable Agriculture Sciences, Rothamsted ResearchOkehamptonUK
| | - J. M. B. Hawkins
- Sustainable Agriculture Sciences, Rothamsted ResearchOkehamptonUK
| | | | - R. M. Dunn
- Sustainable Agriculture Sciences, Rothamsted ResearchOkehamptonUK
| | - A. L. Collins
- Sustainable Agriculture Sciences, Rothamsted ResearchOkehamptonUK
| | - L. M. Cardenas
- Sustainable Agriculture Sciences, Rothamsted ResearchOkehamptonUK
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Xue R, Zhang K, Liu X, Jiang B, Luo H, Li M, Mo Y, Liu C, Li L, Fan L, Chen W, Cheng L, Chen J, Chen F, Zhuang D, Qing J, Lin Y, Zhang X. Variations of methane fluxes and methane microbial community composition with soil depth in the riparian buffer zone of a sponge city park. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 339:117823. [PMID: 37129967 DOI: 10.1016/j.jenvman.2023.117823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 03/10/2023] [Accepted: 03/26/2023] [Indexed: 05/03/2023]
Abstract
Riparian buffers benefit both natural and man-made ecosystems by preventing soil erosion, retaining soil nutrients, and filtering pollutants. Nevertheless, the relationship between vertical methane fluxes, soil carbon, and methane microbial communities in riparian buffers remains unclear. This study examined vertical methane fluxes, soil carbon, and methane microbial communities in three different soil depths (0-5 cm, 5-10 cm, and 10-15 cm) within a riparian buffer of a Sponge City Park for one year. Structural equation model (SEM) results demonstrated that vertical methane fluxes varied with soil depths (λ = -0.37) and were primarily regulated by methanogenic community structure (λ = 0.78). Notably, mathematical regression results proposed that mcrA/pmoA ratio (R2 = 0.8) and methanogenic alpha diversity/methanotrophic alpha diversity ratio (R2 = 0.8) could serve as valid predictors of vertical variation in methane fluxes in the riparian buffer of urban river. These findings suggest that vertical variation of methane fluxes in riparian buffer soils is mainly influenced by carbon inputs and methane microbial abundance and community diversity. The study's results quantitatively the relationship between methane fluxes in riparian buffer soils and abiotic and biotic factors in the vertical direction, therefore contributing to the further development of mathematical models of soil methane emissions.
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Affiliation(s)
- Ru Xue
- College of Environmental Sciences, Sichuan Agricultural University, Chengdu, 611130, China; Limnology, Department of Ecology and Genetics, Uppsala University, Uppsala, 75236, Sweden
| | - Ke Zhang
- Department of Municipal Engineering, College of Civil Engineering, Sichuan Agricultural University, Chengdu, 611830, China; Sichuan Higher Education Engineering Research Center for Disaster Prevention and Mitigation of Village Construction, Sichuan Agricultural University, Chengdu, 611830, China
| | - Xiaoling Liu
- Department of Information Engineering, Sichuan Water Conservancy Vocational College, Chengdu, 611231, China
| | - Bing Jiang
- Dujiangyan Campus, Sichuan Agricultural University, Chengdu, 611830, China
| | - Hongbing Luo
- College of Environmental Sciences, Sichuan Agricultural University, Chengdu, 611130, China; Department of Municipal Engineering, College of Civil Engineering, Sichuan Agricultural University, Chengdu, 611830, China; Sichuan Higher Education Engineering Research Center for Disaster Prevention and Mitigation of Village Construction, Sichuan Agricultural University, Chengdu, 611830, China.
| | - Mei Li
- School of Urban and Rural Construction, Chengdu University, Chengdu, 610106, China
| | - You Mo
- Department of Municipal Engineering, College of Civil Engineering, Sichuan Agricultural University, Chengdu, 611830, China; Sichuan Higher Education Engineering Research Center for Disaster Prevention and Mitigation of Village Construction, Sichuan Agricultural University, Chengdu, 611830, China
| | - Cheng Liu
- Dujiangyan Campus, Sichuan Agricultural University, Chengdu, 611830, China
| | - Lin Li
- Department of Municipal Engineering, College of Civil Engineering, Sichuan Agricultural University, Chengdu, 611830, China
| | - Liangqian Fan
- Department of Municipal Engineering, College of Civil Engineering, Sichuan Agricultural University, Chengdu, 611830, China
| | - Wei Chen
- Department of Municipal Engineering, College of Civil Engineering, Sichuan Agricultural University, Chengdu, 611830, China
| | - Lin Cheng
- Department of Municipal Engineering, College of Civil Engineering, Sichuan Agricultural University, Chengdu, 611830, China
| | - Jia Chen
- Department of Municipal Engineering, College of Civil Engineering, Sichuan Agricultural University, Chengdu, 611830, China
| | - Fenghui Chen
- Department of Municipal Engineering, College of Civil Engineering, Sichuan Agricultural University, Chengdu, 611830, China
| | - Daiwei Zhuang
- Department of Municipal Engineering, College of Civil Engineering, Sichuan Agricultural University, Chengdu, 611830, China
| | - Jing Qing
- Department of Municipal Engineering, College of Civil Engineering, Sichuan Agricultural University, Chengdu, 611830, China
| | - Yuanmao Lin
- Department of Municipal Engineering, College of Civil Engineering, Sichuan Agricultural University, Chengdu, 611830, China
| | - Xiaohong Zhang
- College of Environmental Sciences, Sichuan Agricultural University, Chengdu, 611130, China
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