Characteristics of Humic Substances in Paddy Soils
YEWEI;WENQI－XIAO
【期刊名称】《土壤圈：英文版》 【年(卷),期】1991(001)003
【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. 【总页数】11页(229-239)
【关键词】水稻土;腐殖酸;腐殖作用;芳香度;灰黄霉酸 【作者】YEWEI;WENQI－XIAO
Characteristics of Humic Substances in Paddy Soils
