耕作措施对土壤有机碳稳定性的影响——以黑龙江省与吉林省典型地区为例

Effect of Tillage Treatments on Soil Organic Carbon Stability——In Case of the Typical Area in Heilongjiang and Jilin Provinces

采用传统的化学方法、红外光谱(IR)技术和固态^(13)C核磁共振(NMR)技术,研究黑龙江与吉林土壤有机碳的含量及结构特征,探讨耕作措施对不同地区土壤有机碳稳定性的影响。研究结果表明:短期免耕耕作处理并没有显著增加土壤有机碳含量。但与免耕前相比,免耕后土壤有机质的脂族性减弱,稳定碳/不稳定碳的比值增加,免耕后土壤胡敏素中烷基C/烷氧C和疏水C/亲水C的比值均呈增加趋势,疏水程度增加。因此,短期免耕虽然不能显著增加土壤有机碳含量,但是能够增强土壤有机碳的稳定性。

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 1 3 C Nuclear Magnetic Resonance (NMR)spec-troscopy 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 sig-nificantly increase,the stability of SOC could be enhanced by the short term no-tillage.