| 摘要: |
| 采用酒精分级沉淀法,按芳构化程度高低将塿土不同层次胡敏酸分成7个级分,并对各级分的性质进行了研究。结果表明,塿土耕层土壤胡敏酸以级分4为主,占胡敏酸原样的25. 20%;粘化层、淀积层胡敏酸以级分1为主,占胡敏酸原样的85%左右。和耕层胡敏酸相比,粘化层、淀积层土壤胡敏酸中颗粒大、芳构化度高的组分多。耕层土壤胡敏酸由A、P、Rp 3种类型级分构成,粘化层、淀积层胡敏酸由A、B 2种类型级分构成。 |
| 关键词: 塿土，胡敏酸，酒精沉淀分级，级分变异 |
| DOI： |
| 分类号:S153.622 |
| 基金项目: |
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| A Study on the Variation of Humic Acid Fractions in Different Horizons of Lou Soil |
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| Abstract: |
| In this paper, humic acid extracted from different horzons Lou of soil
was classified into 7 fractions according to the condensation degree by alcohol fractional
precipitation technique, and the properties of the fractions were studied. The results
showed that fraction 4 was the main component of soil in humic acid cultivation horizon,
and in claying and CaCO3 illuvial horizons was fraction 1; the two fractions accounted for
25, 20 and 85 percent of the total humic acid, respectively.Comparing with humic acid
from cultivation horizon, humic acid from claying and CaCO3 illuvial horizons was largely
composed of fractions with large particle size and high humification degree.Humic acid
from cultivation horizon was made up of A,P and Rp type fractions, and those from claying and CaCO3 illuvial horizon were composed of A and B type fractions. |
| Key words: Lou Soil,humic acid,alcohol precipition fractionatation,fraction variation |
