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应用核磁共振技术表征长期施用2个水平生物固体的土壤中提取的胡敏酸特征,以评估生物固体修复土壤中有机碳的稳定性。同时,量化土壤中富里酸、胡敏酸和Fe/Al氧化物含量。土壤样品采集于2004年,于伊利诺斯州西南部的富尔顿县选取7个地块进行取样,取样地块生物固体的累积施用量分别为0(对照)、554(低施用量)和1066 mg/hm~2(高施用量)。结果表明,生物固体的施用增加了土壤富里酸与胡敏酸的含量,但是生物固体修复的土壤和对照土壤的FA/HA比值没有差异。此外,生物固体的施用不影响水溶性有机碳的含量,却能增加土壤有机复合体中Fe/Al含量,降低其C/Fe和C/Al比例。~(13)C核磁共振波谱结果表明,随着生物固体的施用土壤胡敏酸中烷基碳增加和芳香碳降低,且施用量越高,变化程度越大;土壤胡敏酸碳结构也从氧烷基主导变为烷基主导。生物固体的施用不能降低土壤有机碳的稳定性,相反,能够增加土壤腐殖质的稳定性。
The characteristics of humic acid extracted from soils biosoluble in long-term application of two horizontal biosolids were characterized by nuclear magnetic resonance (NMR) to assess the stability of organic carbon in biosolids-amended soils. At the same time, the contents of fulvic acid, humic acid and Fe / Al in soil were quantified. Soil samples were collected in 2004 and seven plots were taken in Fulton County, southwestern Illinois, for sampling. The cumulative application of biosolids was 0 (control), 554 (low application) and 1066 mg / hm ~ 2 (high application rate). The results showed that the application of biosolids increased the content of soil fulvic acid and humic acid, but there was no difference in FA / HA ratio between biosolids amended soil and control soil. In addition, application of biological solids did not affect the content of water-soluble organic carbon, but increased the content of Fe / Al in soil organic complexes and decreased the ratio of C / Fe and C / Al. ~ (13) C nuclear magnetic resonance spectroscopy results show that with the application of biological solids in soil humic acid alkyl carbon increased and aromatic carbon decreased, and the higher the application rate, the greater the degree of change; soil humic acid carbon structure from Alkoxy predominates to alkyl predominance. The application of biological solids can not reduce the stability of soil organic carbon, on the contrary, can increase the stability of soil humus.