Abstract
The mechanism of organic carbon sequestration in different genesis of paddy soils has not been well understood. A 6-month incubation experiment, adding maize straw, was performed in three different genesis of paddy soils and an uncultivated marsh soil. Fourier transform infrared (FTIR) spectroscopy was used to investigate the characteristics of Fe/Al bound organic carbon (Fe/Al-OC) extracted with a mixed solution of 0.1 M NaOH and Na4P2O7 from soils. The function groups of Fe/Al-OC such as phenol-C, amide-C, and C–O groups of polysaccharides were demonstrated by FTIR spectroscopy. Compared to control treatment, the proportion of phenol-C of Fe/Al-OC added maize straw increased with time, but the C–O groups of polysaccharides decreased. These results indicate that polysaccharide groups of Fe/Al-OC mainly contribute to the sequestration of Fe/Al-OC during the primary decomposition stage of maize straw, and the phenol group was stable in different genesis of paddy soils. Both of the polysaccharides and phenol groups were important to C sequestration in paddy soils and marsh soil.
Highlights
The mechanism of organic carbon sequestration in different genesis of paddy soils has not been well understood
Effect of phosphate and/or pyrophosphate on the bands of Fourier transform infrared (FTIR) spectroscopy The assignment of the absorption bands at about 1100 cm−1 was frequently assigned to alcoholic and Stability of phenol and polysaccharides groups of Fe/Al‐organic carbon (OC) In this study, the results of FTIR spectroscopy showed that the proportion of polysaccharide increased in the primary stage, and it decreased due to the rapid depletion without new carbon input
Sequestration of Fe/Al-OC during the primary decomposition stage of maize straw, and the phenol group was stable in different genesis of paddy soils
Summary
The mechanism of organic carbon sequestration in different genesis of paddy soils has not been well understood. A 6-month incubation experiment, adding maize straw, was performed in three different genesis of paddy soils and an uncultivated marsh soil. The carbon cycling in soils is a critical process of earth surface system closely related to global climate change, and the interest in agricultural soil as global carbon storage has increased in recent years [1, 2]. Organic matter (OM) mineralization in soil may be reduced through increasing organic carbon (OC) sequestration into hydrophobic domains in humic material of comfortable composition [3]. The OC sequestration in China’s rice paddies related to chemical binding of iron or aluminum [5].
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