Pedosphere 2(1): 51--61, 1992
ISSN 1002-0160/CN 32-1315/P
©1992 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effects of Water Regime and Reaction of Soil on Properties of Newly—Formed Humic Substances |
| CHENGLI－LI WENQI－XIAO |
[1]InstituteofSoilScience,AcademiaSinica,P.O.Box821,Nanjing210008(China)
[2]LaboratoryofMaterialCyclinginPe,AcademiaSinica,P.O.Box821,Nanjing210008(China)
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| ABSTRACT |
| The effects of soil water regime and soil reaction on nitrogen distribution and fractional composition of newly-formed humus (decayed products) and the structural characteristics of the newly-formed humic acids(HAs) were studied in an incubation experiment,with the following results obtained: 1.The humus newly formed under submerged conditions was higher in the relative content of α-amino acid-N and the humic acid/fulvic acid (HA/FA) ratio than that under upland conditions.The HAs extracted from the former were also higher in C/O ratio,aromaticity and the contents of methoxyl groups and lignin-like components,but lower in the content of carboxyl groups than the HAs from the latter. 2.Under upland conditions,the C/ organic N ratio and the relative content of mobile HA of newly-formed humus were lower,but the HA/FA ratio was higher in the CaCO2-amended treatment than in non-amended treatment.The presence of CaCO3 also resulted in a decrease of C/N ratio of HA and a slight increase of its carboxyl group content.On the other hand,there was no significant change in the composition and properties of the newly-formed humus with the addition of CaCO3 under submerged conditions. 3.Compared with soil HAs,the newly-formed HAs contained more carbohydrates,polypeptides and lignin-like components,and were in lower degrees of oxidation and humification. |
| Key Words: |
| Citation: . 1992. Effects of Water Regime and Reaction of Soil on Properties of Newly—Formed Humic Substances. Pedosphere. 2(1): 51-61. |
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