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- W4200213679 abstract "Both livestock grazing and soil freeze-thaw cycles (FTCs) can affect the soil-atmosphere exchange of greenhouse gases (GHGs) in grasslands. However, the combined effects of grazing and FTCs on GHG fluxes in meadow steppe soils remain unclear. In this study, we collected soils from paired grazing and enclosed sites and conducted an incubation experiment to investigate the effect of grazing on soil GHG fluxes in the meadow steppes of Inner Mongolia during three FTCs. Our results showed that FTCs substantially stimulated the emissions of soil N 2 O and CO 2 and the uptake of CH 4 in the meadow steppes. However, compared with enclosure treatments, grazing significantly reduced the cumulative N 2 O, CO 2 and CH 4 fluxes by 13.3, 14.6, and 26.8%, respectively, during the entire FTCs experiment. The soil dissolved organic carbon (DOC) and nitrogen (DON), NH 4 + -N and NO 3 – -N, significantly increased after three FTCs and showed close correlations with N 2 O and CO 2 emissions. Structural equation modeling (SEM) revealed that the increase in NO 3 – -N induced by FTCs dominated the variance in N 2 O emissions and that DOC strongly affected CO 2 emissions during thawing periods. However, long-term grazing reduced soil substrate availability and microbial activity and increased soil bulk density, which in turn decreased the cumulative GHG fluxes during FTCs. In addition, the interaction between grazing and FTCs significantly affected CO 2 and CH 4 fluxes but not N 2 O fluxes. Our results indicated that livestock grazing had an important effect on soil GHG fluxes during FTCs. The combined effect of grazing and FTCs should be taken into account in future estimations of GHG budgets in both modeling and experimental studies." @default.
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- W4200213679 date "2021-12-10" @default.
- W4200213679 modified "2023-10-16" @default.
- W4200213679 title "Grazing Reduces the Soil-Atmosphere Exchange of Greenhouse Gases During Freeze-Thaw Cycles in Meadow Steppes in Inner Mongolia" @default.
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- W4200213679 doi "https://doi.org/10.3389/fevo.2021.795203" @default.
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