Variations of methane fluxes and methane microbial community composition with soil depth in the riparian buffer zone of a sponge city park. (1st August 2023)

• Record Type: Journal Article
• Authors: Xue, Ru; Zhang, Ke; Liu, Xiaoling; Jiang, Bing; Luo, Hongbing; Li, Mei; Mo, You; Liu, Cheng; Li, Lin; Fan, Liangqian; Chen, Wei; Cheng, Lin; Chen, Jia; Chen, Fenghui; Zhuang, Daiwei; Qing, Jing; Lin, Yuanmao; Zhang, Xiaohong
• Is Part Of: Journal of environmental management. Volume 339(2023)
• Publication Date: 2023-08-01
• Subjects: Sponge city -- Soil carbon -- Methane fluxes -- mcrA -- pomA -- Structural equation model; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2023.117823
• Languages: English
• ISSNs: 0301-4797

Abstract

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 mcr A/ pmo A ratio (R 2 = 0.8) and methanogenic alpha diversity/methanotrophic alpha diversity ratio (R 2 = 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. Graphical abstract: Image 1 Highlights: Vertical CH4 fluxes varied significantly from 0 to 15 cm depth in riparian buffer soils. Methanogenic community structure had a direct effect on vertical CH4 fluxes (λ = 0.78). The mcr A /pmo A ratio could be used as a predictor variable of vertical CH4 fluxes. Non-linear relationship existed among CH4 flux, soil C and CH4 microbial communities.