Characteristics of Soil Humic Acids in Jilin Province, Northeast China

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  • 中国東北部,吉林省に分布する土壌の腐植酸の特徴
  • チュウゴク トウホクブ キツリンショウ ニ ブンプ スル ドジョウ ノ フショクサン ノ トクチョウ

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Humic acids (HA) extracted from five soils (Meadow Black soil, Ortho Black soil, Lessive, Chernozem, and Steppe Solonetz) in Jilin province, northeast part of China, were studied on elemental and functional group composition, component analysis fractionated with XAD-8 resin, and hydrogen distribution estimated by ^1H-NMR. Organic carbon contents of these soils were less than 18g kg^<-1>, in which Black soils showed highest contents. Solonetz showed lowest organic carbon contents because humic substances leached out from soils due to high pH of them. Remaining humic substances would combine with calcium, and were hardly extractable with alkali solution containing pyrophosphate. E_<600> value, absorbance coefficient for 1% HA solution at 600nm, decreased in the order: Black soils, Lessive, Chernozem, and Solonetz. H/C atomic ratios of HA increased in the above order. E_<600> value and H/C ratio of HA of Black soils were in the range of those of Andisols in Japan. E_<600> values of HA of the other Jilin soils were intermediate between those of Andisol and brown forest soils in Japan. Carboxyl group content of HA decreased and alcoholic hydroxyl group content increased in the order: Black soils, Lessive, Chernozem, and Solonetz. Carboxylic component content decreased and aliphatic component content decreased in the above order. Component distribution of HA of Black soils resembled that of Andisol. These soil HA from Jilin, northeast China, showed very low content of phenolic component as compared with those of temperate and tropical soils. Black soil HA showed high percentages of aromatic protons and low percentages of aliphatic protons β to aromatic carbon rings. The average length of aliphatic substituents of HA was estimated to increase in the order: Black soils, Lessive, Chernozem, and Solonetz.

Journal

  • Pedologist

    Pedologist 43 (2), 88-97, 1999-12-31

    Japanese Society of Pedology

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