STUDIES OF SOIL ORGANO‐MINERAL FRACTIONS
作者:
J. R. WATSON,
J. W. PARSONS,
期刊:
Journal of Soil Science
(WILEY Available online 1974)
卷期:
Volume 25,
issue 1
页码: 1-8
ISSN:0022-4588
年代: 1974
DOI:10.1111/j.1365-2389.1974.tb01096.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
SummarySand‐, silt‐, and clay‐size organo‐mineral fractions were isolated in bulk from surface horizons of five soils following ultrasonic dispersion in water. Good clay separation was achieved for all except one highly organic, calcareous clay soil. Organic‐N and ‐C were concentrated in the clay and silt fractions but for each soil the organic C : N ratio decreased in the order sand>silt>whole soil>clay. Acid hydrolysis of the silt and clay fractions revealed a slight concentration of amino acid‐N and NH4‐N in the clays but only small differences in the distribution of individual amino acids were observed. The results suggest that both silt and clay fractions may be important in the stabilization of soil
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