Effect of In Situ Large Soil Column Translocation on CO2 and CH4 Fluxes under Two Temperate Forests of Northeastern China

Forests, Journal Year: 2023, Volume and Issue: 14(8), P. 1531 - 1531

Published: July 27, 2023

Global warming has a significant impact on soil carbon dioxide (CO2) and methane (CH4) fluxes in temperate forests. However, due to lack of field observations, limited information is available about the responses CO2 CH4 changes temperature during non-growing season throughout year The broadleaf Korean pine mixed mature forest (MF) adjacent secondary white birch (BF) at different succession stages Changbai mountain region northeastern China were selected, study effect situ column translocation On average, air 5 cm depth under BF stands from October 2018 2022 increased by 0.64 0.42 °C 0.49 0.43 year, respectively, compared with those MF stands. Based multi-year measurements experiments, it was shown that season, columns ranged 0.004 1.175 0.015 1.401 (averages 0.321 0.387) μmol m−2 s−1, −1.003 0.048 −1.037 −0.013 −0.179 −0.250) nmol accounting for approximately 20.8% 25.3%, 48.8% 69.1% corresponding average growing season. When undisturbed transferred stand, simulate warming, cumulative emissions uptake 23.5% 15.3% 9.5% 16.3% across respectively. when cooling, decreased 16.9% 0.1% Upon 21.8% but 15.4% year. moisture could explain 84–86% variability 16–51% two measurement period. results experiments highlight small climate nature can increase forests China, particularly which should be considered predicting C global scenarios.

Language: Английский

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Effects of Soil Physicochemical Properties on Maize, Wheat, and Soybean Yields in Maize-Wheat and Maize-Soybean Intercropping Systems in China: a Meta-analysis

Journal of soil science and plant nutrition, Journal Year: 2023, Volume and Issue: 24(1), P. 21 - 29

Published: Nov. 29, 2023

Language: Английский

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Forest-floor respiration, N₂O fluxes, and CH₄ fluxes in a subalpine spruce forest: drivers and annual budgets

Biogeosciences, Journal Year: 2024, Volume and Issue: 21(8), P. 2005 - 2028

Published: April 24, 2024

Abstract. Forest ecosystems play an important role in the global carbon (C) budget by sequestering a large fraction of anthropogenic dioxide (CO2) emissions and acting as methane (CH4) sinks. The forest-floor greenhouse gas (GHG; CO2, CH4, nitrous oxide (N2O)) flux, i.e., from soil understory vegetation, is one major components to consider when determining C or GHG forests. Although winter fluxes are essential determine annual budget, only very few studies have examined long-term, year-round fluxes. Thus, we aimed (i) quantify seasonal variations fluxes; (ii) evaluate their drivers, including effects snow cover, timing, amount snowmelt; (iii) calculate budgets for subalpine spruce forest Switzerland. We measured during 4 years with four automatic chambers at ICOS Class 1 Ecosystem station Davos (CH-Dav). applied random models investigate environmental drivers gap-fill flux time series. floor emitted 2336 g CO2 m−2 yr−1 (average over years). Annual respiration responded most strongly temperature depth. No response leaf area index photosynthetic photon density was observed, suggesting strong direct control factors weak, even lacking, indirect canopy biology. Furthermore, consistent CH4 sink (−0.71 yr−1), driven mainly Winter were less (6.0 %–7.3 %), while contributed substantially (14.4 %–18.4 %). N2O low (0.007 negligible our site. In 2022, warmest year on record below-average precipitation site, observed substantial increase compared other years. mean indicated 2319 ± 200 eq. (mean standard deviation (SD) all years), dominating offsetting small proportion (0.8 %) emissions. Due relevance recommend measurements high temporal resolution. future increasing temperatures cover due climate change, expect increased this site modulating ecosystem.

Language: Английский

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Fire Reduces Soil Nitrate Retention While Increasing Soil Nitrogen Production and Loss Globally

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 16, 2024

Elucidating the response of soil gross nitrogen (N) transformations to fires could improve our understanding how fire affects N availability and loss. Yet, internal transformation rates respond remains unexplored globally. Here, we investigate general its consequences for The results showed that increased mineralization rate (GNM; +38%) ammonium concentration (+47%) as a result decreased C/N ratio but microbial nitrate immobilization (

Language: Английский

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