Electrical conductivity as a reliable indicator for assessing land use effects on stream N2O concentration

Zhang, Sibo; Xia, Xinghui; Xin, Yuan; Li, Xiaokang; Wang, Junfeng; Yu, Leilei; Li, Cangbai; McDowell, William H.; Tan, Qian; Yang, Zhifeng

doi:10.1016/j.jhydrol.2023.130253

Cited by 5 publications

(2 citation statements)

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“…In the current study, we found that the abundances of nir and nosZ I genes, as well as ∆N 2 O, increased significantly from forest streams to human‐disturbed streams due to enhanced nutrient levels (Table S2). However, human disturbance also led to higher levels of sulfide, heavy metals, and toxic hydrocarbons in human‐disturbed streams (Zhang et al, 2023). For example, the concentration of sulfide in forest streams (4.7 mg kg −1 ) was approximately 60 times lower than that in human‐disturbed streams (283.2 mg kg −1 ).…”

Section: Resultsmentioning

confidence: 99%

“…A total of 25 streams (33.95–37.74 °N; 107.03–112.54 °E) within the Yellow River watershed (Figure S1) were selected with the aid of Google Earth and sampled during August 2021. The average water depth of these streams was approximately 40 cm, and the maximum width was less than 10 m. Recent studies (Wang, et al, 2022; Zhang et al, 2023) have indicated that in stream environments, sediments are the primary location for both the production and reduction of N 2 O. Based on the dominant terrestrial land cover, the sampled streams were classified into agriculture, urban, and forest categories.…”

Section: Methodsmentioning

confidence: 99%

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Biogeography and impact of nitrous oxide reducers in rivers across a broad environmental gradient on emission rates

Zhang,

Xia,

et al. 2024

Environmental Microbiology

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Microbial communities that reduce nitrous oxide (N2O) are divided into two clades, nosZI and nosZII. These clades significantly differ in their ecological niches and their implications for N2O emissions in terrestrial environments. However, our understanding of N2O reducers in aquatic systems is currently limited. This study investigated the relative abundance and diversity of nosZI‐ and nosZII‐type N2O reducers in rivers and their impact on N2O emissions. Our findings revealed that stream sediments possess a high capacity for N2O reduction, surpassing N2O production under high N2O/NO3‐ ratio conditions. This study, along with others in freshwater systems, demonstrated that nosZI marginally dominates more often in rivers. While microbes containing either nosZI and nosZII were crucial in reducing N2O emissions, the net contribution of nosZII‐containing microbes was more significant. This can be attributed to the nir gene co‐occurring more frequently with the nosZI gene than with the nosZII gene. The diversity within each clade also played a role, with nosZII species being more likely to function as N2O sinks in streams with higher N2O concentrations. Overall, our findings provide a foundation for a better understanding of the biogeography of stream N2O reducers and their effects on N2O emissions.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%