Journal
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
Volume 92, Issue -, Pages 123-128Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2013.03.006
Keywords
Organic chlorinated pesticides (OCPs); Soil protozoa; Ciliate
Categories
Funding
- National Natural Science Foundation of China [41271487]
- Program of International ST Cooperation [2012DFA91150]
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The occurrence of Sigma HCHs, Sigma DDTs, protozoa abundance and their community structure in surface soils of orchards, vegetable lands, and barren lands in northern west outskirts of Beijing were detected in order to investigate the protozoa responses to low dose organic chlorinated Pesticides (OCPs) after long-term field-based exposure. Significant differences in total concentrations of HCHs and DDTs were found among the three general groups ranking in decreasing order of concentration from orchard > vegetable lands > barren lands. Ciliate was the rare group in surface soils of all the sampling groups. The abundance of flagellate, ciliate, and amoebae in vegetable soils were significantly higher than those in orchard soils. The abundance of all the taxa of protozoa was strongly negative correlated with the residue level of Sigma HCHs and Sigma DDTs (P < 0.05) in agricultural soils. However, no negative correlation between the residue levels of OCPs and protozoa abundance was shown in both the orchard and the barren soils. This field study demonstrated a considerable long-term impact of the OCPs residue on the abundance of protozoa in soils, and that the abundance of soil protozoa was much more influenced by land use type in association with different soil properties. (C) 2013 Elsevier Inc. All rights reserved.
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