Abstract
ABSTRACT Our survey was carried out in two study sites of approximately 3.3 ha each located in the Suwalki Lake District in NE Poland in the year 2008. Earthworms and soil samples were collected during two campaigns (spring and autumn) from 25 × 25 cm and 30 cm deep sampling points. The complex arable landscape (CAL) supported higher earthworm diversity, density and biomass than the similarly managed but homogeneous arable landscape (HAL). The spring and autumn earthworm sampling campaigns revealed very different patterns, and we conclude that autumn sampling is the most adequate for biomonitoring. On the other hand, the spring collections were significantly correlated to soil physical parameters, thus spring sampling is more suitable for studying such correlations. Significant correlations occurred almost exclusively for CAL and the soil parameters significantly relating with earthworm community were: soil moisture, nitrogen and organic carbon contents. The possible reason for it is the presence of numer...
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