Pedosphere 6(2): 121--128, 1996
ISSN 1002-0160/CN 32-1315/P
©1996 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effect of clay minerals on the chemical characteristics of soil humus |
| YE Wei and WEN Qi-Xiao |
| Institute of Soil Science, Academia Sinica, Nanjing 210008 (China) |
| ABSTRACT |
| Chemical characteristics of humic substances in soils with different mineralogical characteristics and under different utilization patterns in Zhangpu, Fujian Province, together with two pairs of cultivated soils in North China Plain were studied by chemical analysis, visible and IR spectroscopy and 13C NMR spectrometry. For soils in Zhangpu the HA/FA ratio and both the aromaticity and the degree of humification of HA were higher in soils with montmorillonite as the predominant clay mineral than in those with kaolinite as the predominant clay mineral, provided these soils were under the same utilization pattern. While for each pair of soils with similar mineralogical characteristics the HA/FA ratio was higher and the C/H ratio and the content of carboxyl group of HA were lower in paddy soil than in upland soil. Among the upland soils (or paddy soils) studied the HA/FA ratio of soil in Zhangpu with kaolinite as the predominant clay mineral was the lowest, and that of soil in Zhangpu with montmorillonite as the predominant clay mineral was the highest. It was concluded that the presence of montmorillonite favored the formation and maturation of humic acid. |
| Key Words: aromaticityl catalytic polymerization, fulvic acid, humic acid |
| Citation: Ye, W. and Wen, Q. X. 1996. Effect of clay minerals on the chemical characteristics of soil humus. Pedosphere. 6(2): 121-128. |
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