Influences of chronic contamination of oil field exploitation on soil nematode communities at the Yellow River Delta of China

Abstract

Oil production related activities have led to many environmental problems. Around 80% of the total output of crude oil is generated from terrestrial oilfields in the world. However, the impact of oil exploitation procedures on soil animal communities has not been fully understood. This study investigated the responses of soil nematode communities to the oil exploitation activities in the Yellow River Delta of China. By setting 10 oilfield sites and 5 relatively uncontaminated sites (controls), we found that the content of soil total petroleum hydrocarbons (TPH) was significantly higher at oilfield sites than at controls. With a longer oil exploitation history, the content of soil TPH increased. Soil nematode community structure at oilfield sites was largely different from that at controls. Soil nematodes were significantly less abundant but more diverse at oilfield sites than at controls. The proportions of fungal feeders were significantly lower at oilfield sites than at controls, attaining only half of those at controls. The nematode trophic diversity and genus number negatively correlated with the duration of petroleum exploitation history. This study elucidated the difference in soil nematode communities caused by oilfield exploitation and indicated that the nematode diversity was most obviously influenced by the soil TPH content and the oil exploitation history.

Keywords

community composition / oil exploitation history / oilfield / soil nematodes / the Yellow River Delta

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Acknowledgements

This research was supported by the National Basic Research Program of China (No. 2006CB403305).

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg