Population dynamics of Enchytraeidae (Oligochaeta) in different agricultural systems |
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Authors: | P C J van Vliet D C Coleman P F Hendrix |
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Institution: | (1) Institute of Ecology, University of Georgia, Athens, GA 30602, USA, GE;(2) University of Western Australia, Soil Science and Plant Nutrition, Nedlands, WA 6907, Australia Tel.: 9380-2503; Fax: 9380-1050, AU |
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Abstract: | Organic matter and abiotic conditions seem to influence distribution patterns of Enchytraeidae. In this study effects of
changes in management practices on population dynamics of enchytraeids were determined. At two sites (in Athens and Griffin,
GA) parts of a fescue (FE) field were converted into conventional tillage (CT) and no-tillage (NT) plots and changes in densities
and depth distribution of enchytraeids were followed for 3 years. A site at Watkinsville, containing various soil textures
and characterised by very low organic carbon content, which was converted into no-tillage 4 years earlier, was also sampled.
Significant reductions in enchytraeid densities, after conversion of fescue into CT, were only found at Griffin. The management
practices affected the vertical distribution of enchytraeids. In fescue and NT more enchytraeids were found in the 0–5cm than
in the 5–15cm layer. In conventional tillage fields enchytraeids were more evenly distributed over the profile or more abundant
in the 5–15cm layer. Management also affected the timing of population dynamics in the different plots. At two sample dates
high abundances were found in CT plots only, not in any of the other plots. Enchytraeids were larger at Athens than at Griffin
and Watkinsville and contained more soil particles in their gut. At Athens enchytraeids will presumably contribute more to
the development of soil structure than at the other sites. We conclude that management affects vertical enchytraeid distributions
in soil and changes the timing of population dynamics.
Received: 7 January 1996 |
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Keywords: | Enchytraeidae Population dynamics Soil moisture Soil management Vertical distribution Conventional tillage No-tillage |
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