Freeze–Thaw Events Change Soil Greenhouse Gas Fluxes Through Modifying Soil Carbon and Nitrogen Cycling Processes in a Temperate Forest in Northeastern China

作者：Chuying Guo, Leiming Zhang, Shenggong Li, Yuxin Chen · 发表于：Forests · 年份：2024 · DOI：10.3390/f15122082 · 被引用次数：5 · 研究领域：Climate change and permafrost、Soil Carbon and Nitrogen Dynamics、Peatlands and Wetlands Ecology

Freeze–thaw events are predicted to be more frequent in temperate forest ecosystems. Whether and how freeze–thaw cycles change soil greenhouse gas fluxes remains elusive. Here, we compared the fluxes of three soil greenhouse gases (CO2, CH4, and N2O) across the spring freeze–thaw (SFT) period, the growing season (GS), and the annual (ALL) period in a temperate broad-leaved Korean pine mixed forest in the Changbai Mountains in Jilin Province, Northeastern China from 2019 to 2020. To assess the mechanisms driving the temporal variation of soil fluxes, we measured eleven soil physicochemical factors, including temperature, volumetric water content, electrical conductivity, gravimetric water content, pH, total carbon, total nitrogen, total-carbon-to-total-nitrogen ratio, nitrate (NO3−), ammonium (NH4+), and dissolved organic carbon, all of which play crucial roles in soil carbon (C) and nitrogen (N) cycling. Our findings indicate that the soil in this forest functioned as a source of CO2 and N2O and as a sink for CH4, with significant differences in greenhouse gas (GHG) fluxes among the SFT, GS, and ALL periods. Our results suggest freeze–thaw events significantly but distinctly impact soil C and N cycling processes compared to normal growing seasons in temperate forests. The soil N2O flux during the SFT (0.65 nmol m−2 s−1) was 4.6 times greater than during the GS (0.14 nmol m−2 s−1), likely due to the decreased NO3− concentrations that affect nitrification and denitrification pr...