Abstract:

In this paper, the chemical content and structure of soil organic carbon (SOC) were studied by using chemical analysis, Infrared Spectroscopy (IR) and Solid-state ¹³C Nuclear Magnetic Resonance (NMR) spectroscopy in Heilongjiang and Jilin provinces. And the effects of different tillage treatments on soil organic carbon stability in different regions were investigated. The results showed that the contents of SOC were not significantly increased in this study. However, comparing with tillage, aliphatic carbon contents in the SOC decreased, and the proportion of stable/unstable carbon increased. After no-tillage treatment, A/O—A and Hydrophobic C/ Hydrophilic C of humin obviously increased, and Hydrophobicity improved. Although SOC content cannot significantly increase, the stability of SOC could be enhanced by the short term no-tillage.

Key words: Infrared Spectroscopy, Solid-state ¹³C Nuclear Magnetic Resonance, tillage treatment, humin, Heilongjiang, Jilin