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- W2969032017 endingPage "133882" @default.
- W2969032017 startingPage "133882" @default.
- W2969032017 abstract "Symbiotic dinitrogen (N2)-fixing trees have been expanding to boreal peatlands, yet its influence on dissolved organic carbon (DOC) biodegradation is unclear. Here, we measured DOC, ammonium‑nitrogen (NH4+-N), nitrate‑nitrogen (NO3−-N), dissolved inorganic nitrogen (DIN), and dissolved total nitrogen (DTN) concentrations, specific ultraviolet absorbance at 254 nm (SUVA254), and humification index in the extracts obtained from peats in the 0–10 cm, 10–20 cm, and 20–40 cm depths in the open peatlands and Alnus sibirica islands in a boreal peatland, Northeast China. Afterwards, the peat extracts were used to assess the effect of N2-fixing woody plant expansion on DOC biodegradation with a 42-day incubation experiment. The expansion of A. sibirica significantly increased NH4+-N, NO3−-N, DIN, and DTN concentrations, but did not produce a significant effect on SUVA254 and humification index in the extracts in each depth. Following A. sibirica expansion, DOC biodegradation was enhanced by 24.5%, 15.4%, and 38.3% at 0–10 cm, 10–20 cm, and 20–40 cm depths, respectively. Furthermore, DOC biodegradation was significantly and negatively correlated with DOC:DIN and DOC:DTN ratios, but exhibited no significant relationship with SUVA254 and humification index. This implied that improved N availability and associated shifts in C:N stoichiometry determined the increase in DOC biodegradation following A. sibirica expansion. Our findings suggest that N2-fixing tree encroachment promotes microbial decomposition of DOC through improved N availability in boreal peatlands, which may cause organic C loss from soils in these C-enriched ecosystems." @default.
- W2969032017 created "2019-08-22" @default.
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- W2969032017 date "2019-12-01" @default.
- W2969032017 modified "2023-10-09" @default.
- W2969032017 title "Alnus sibirica encroachment promotes dissolved organic carbon biodegradation in a boreal peatland" @default.
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- W2969032017 doi "https://doi.org/10.1016/j.scitotenv.2019.133882" @default.
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