Nine years of warming and nitrogen addition in the Tibetan grassland promoted loss of soil organic carbon but did not alter the bulk change in chemical structure

Biogeosciences, Год журнала: 2024, Номер 21(2), С. 575 - 589

Опубликована: Янв. 26, 2024

Abstract. Nitrogen (N) and warming effects on ecosystem carbon (C) budgets stabilization are critical to understand as C sequestration is considered a mechanism offset anthropogenic CO2 emissions, which important for accurately predicting and/or potential loss, remaining controversial though. However, the relevant information, especially intervention of environmental controls grassland soil, limited in Tibetan Plateau (TP) regions. Here we used 9-year two-way factorial experiment involving with open top chambers (+1.80 ∘C daytime +0.77 nighttime at soil surface) multilevel nitrogen enrichment treatments (0, 5, 10, 15 gm-2yr-1) TP investigate changes organic (SOC) pool size chemical structure. Nine-year treatment significantly decreased SOC stock grassland. We observed decreasing concentrations may be related C-degrading enzymes. Surprisingly, molecular structure remained unchanged all N-enrichment warmed plots, suggesting that both had affected forms SOC, from simple complex polymeric similar way. Our results suggest long-term stimulates loss but no preference different structures.

Язык: Английский

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Redox control on rhizosphere priming in wetlands

Nature Geoscience, Год журнала: 2024, Номер 17(12), С. 1209 - 1217

Опубликована: Дек. 1, 2024

Язык: Английский

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Forest management practices change topsoil carbon pools and their stability

The Science of The Total Environment, Год журнала: 2023, Номер 902, С. 166093 - 166093

Опубликована: Авг. 6, 2023

Язык: Английский

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Exogenous Carbon Addition Reduces Soil Organic Carbon: The Effects of Fungi on Soil Carbon Priming Exceed Those of Bacteria on Soil Carbon Sequestration

Forests, Год журнала: 2023, Номер 14(6), С. 1268 - 1268

Опубликована: Июнь 19, 2023

Soil organic carbon (SOC) forms the largest terrestrial (C) pool, which is regulated by complex connections between exogenous C input, microbial activity, and SOC conversion. Few studies have examined changes in natural abundance due to activity after inputs karst lime soils China. In this research, 13C isotope tracer technique was employed investigate priming effect of on typical soil (0~20 cm) 13C_litter 13C_calcium carbonate (CaCO3) through a mineralization incubation experiment. Samples were collected at 5, 10, 20, 40, 60, 80 days analyzed for mineralization, distribution across fractions (>250 μm, 53~250 <53 μm), diversity. A control consisting no addition included. considerably higher (15.48% 61.00%, respectively) litter compared CaCO3. The either or CaCO3 reduced total (TOC) macroaggregate μm) microaggregate (53~250 2150.13, 2229.06, 1575.06 mg kg−1 Cbulk average increased mineral particulate fraction (<53 1653.98 Cbulk. As time extended, significantly positive correlation apparent fungal diversity, as well bacterial diversity (R = 0.40, p 0.003) exceeded that sequestration 0.27, 0.02). Our results reveal adding CaCO3, fungi stimulate decomposition bacteria enhance sequestration, with effects being more pronounced. These findings can provide theoretical basis understanding emission reduction soils.

Язык: Английский

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Microbial pathways driving stable soil organic carbon change in abandoned Moso bamboo forests in southeast China

Journal of Environmental Management, Год журнала: 2023, Номер 345, С. 118890 - 118890

Опубликована: Авг. 31, 2023

Язык: Английский

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