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Effect of Earthworms on Organic Chemical Components of Soil
Pages: 318-328
Year: Issue:  3
Journal: Geology-Geochemistry

Keyword:  earthwormsoil extractchemical componentGC-MS;
Abstract: Earthworms are one of the most important groups of soil animals. They not only can improve soil structure and fertility,but also promote the weathering of soil minerals. To investigate the effect of earthworms on organic chemical components of soil and illuminate the mechanisms of weathering soil minerals by earthworm,we extracted organic compounds by solvent methanol from the soils treated with earthworms,and then characterized the organic components of soil extracts using GC-MS after silylation derivatization. Results showed that hydrocarbons were the most abundant components among all extract,followed by esters. There were very few kinds of nitrile in the extract,but with high contents. There were 22 exclusive components in the soils treated with earthworms and 26 exclusive components in control group. Small amounts of organic acids were found in the two kinds of soils,but there were no significant differences in the kinds and contents of the organic acids between the soils treated with earthworms and the control. In addition,none of siderophores were found in all soils. Based on above results,we speculate that the bioweathering of soil minerals,by microorganisms induced by earthworms,occurs on the local region of minerals,and its mechanisms may be explained by Lian’s the combined effect hypothesis.
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