Abstract
We investigated the effects of light fuel oil and hydraulic oil on the invertebrate populations of deciduous forest soil. On 9 May 1973, 6.251 oil m −2 was spread on test plots. At the last sampling in October 1974 22% of the fuel oil and 47% of the hydraulic oil remained in the soil. Both types of oil almost totally destroyed the populations of microarthropods, and practically no recovery was observed by the end of the study. Fuel oil destroyed most Enchytraeidae but about half the enchytraeid population survived the hydraulic oil. Immediately after treatment with fuel oil the population of nematodes decreased, but after July 1973 their numbers were twice those found in control plots. Hydraulic oil had no immediate effect, but gradually the numbers of nematodes increased to many times that of the control plots. During the second year, the numbers of nematodes decreased.
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