13C NMR spectroscopy characterization of particle-size fractionated soil organic carbon in subalpine forest and grassland ecosystemsReport as inadecuate




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Botanical Studies

, 58:23

Ecology

Abstract

BackgroundSoil organic carbon SOC and carbon C functional groups in different particle-size fractions are important indicators of microbial activity and soil decomposition stages under wildfire disturbances. This research investigated a natural Tsuga forest and a nearby fire-induced grassland along a sampling transect in Central Taiwan with the aim to better understand the effect of forest wildfires on the change of SOC in different soil particle scales. Soil samples were separated into six particle sizes and SOC was characterized by solid-state C nuclear magnetic resonance spectroscopy in each fraction.

ResultsThe SOC content was higher in forest than grassland soil in the particle-size fraction samples. The O-alkyl-C content carbohydrate-derived structures was higher in the grassland than the forest soils, but the alkyl-C content recalcitrant substances was higher in forest than grassland soils, for a higher humification degree alkyl-C-O-alkyl-C ratio in forest soils for all the soil particle-size fractions.

ConclusionsHigh humification degree was found in forest soils. The similar aromaticity between forest and grassland soils might be attributed to the fire-induced aromatic-C content in the grassland that offsets the original difference between the forest and grassland. High alkyl-C content and humification degree and low C-N ratios in the fine particle-size fractions implied that undecomposed recalcitrant substances tended to accumulate in the fine fractions of soils.

KeywordsC NMR Particle size Wildfire Humification Aromaticity Soil organic carbon AbbreviationsCcarbon

Nnitrogen

SOCsoil organic carbon

TOCtotal organic carbon

TNtotal nitrogen

NMRnuclear magnetic resonance

CP-MAScross-polarization and magic-angle spinning

C NMRC nuclear magnetic resonance





Author: Yo-Jin Shiau - Jenn-Shing Chen - Tay-Lung Chung - Guanglong Tian - Chih-Yu Chiu

Source: https://link.springer.com/







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