| Characteristics of Humic Substances in Paddy Soils |
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| 作者姓名： | YE WEI WEN QI-XIAO |
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| 作者单位： | [1]DepartmentofSoilBiochemistry,InstituteofSoilScience,AcademiaSinica,P.O.Box821,Nanjing（China） [2]Laboratr,InstituteofSoilScience,AcademiaSinica,P.O.Box821,Nanjing（China） |
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| 摘 要： | In the present paper,the composition of humus and the charateristics of humic acid from seven paddy soils were compared with those of upland (and/or natural) soils.Results show that:(1) in each group of the soil samples for comparison the HA/FA ratio of the humus of a paddy soil,in most cases,was appreciable higher than that of adjacent upland(and/or natural) soil derived from the same parent material;(2) the humic acid extracted from the paddy soils was characterized by a higher C/O ratio,a higher content of methoxyl groups,and a lower content of carboxyl groups than those from the corresponding upland (and/or natural) flooded soils,implying that the humic acid formed under rice cultivation is in a lower degree of humification than that formed under upland(and/or natural) conditions;and (3) the humic acid of paddy soils,however,was not always characterized by a lower aromaticity than that of the corresponding upland(and/or natural) soils.
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| 关 键 词： | 水稻土 腐殖酸 腐殖作用 芳香度 灰黄霉酸 |
Characteristics of Humic Substances in Paddy Soils |
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| YE WEI,WEN QI-XIAO.Characteristics of Humic Substances in Paddy Soils[J].Pedosphere,1991,1(3):229-239. |
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| Authors: | YE WEI and WEN QI-XIAO |
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| Institution: | Department of Soil Biochemistry, Institute of Soil Science, A cademia Sinica, P.O.Box 821, Nanjing;Department of Soil Biochemistry, Institute of Soil Science, A cademia Sinica, P.O.Box 821, Nanjing |
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| Abstract: | In the present paper,the composition of humus and the charateristics of humic acid from seven paddy soils were compared with those of upland (and/or natural) soils.Results show that:(1) in each group of the soil samples for comparison the HA/FA ratio of the humus of a paddy soil,in most cases,was appreciable higher than that of adjacent upland(and/or natural) soil derived from the same parent material;(2) the humic acid extracted from the paddy soils was characterized by a higher C/O ratio,a higher content of methoxyl groups,and a lower content of carboxyl groups than those from the corresponding upland (and/or natural) flooded soils,implying that the humic acid formed under rice cultivation is in a lower degree of humification than that formed under upland(and/or natural) conditions;and (3) the humic acid of paddy soils,however,was not always characterized by a lower aromaticity than that of the corresponding upland(and/or natural) soils. |
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