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Organochlorine pesticides in soils from the Issyk-Kul region in the western Tian Shan Mountains,Kyrgyzstan：Implication for spatial distribution,source apportionment and ecological risk assessment

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Journal of Mountain Science 2018年第7期15卷 1520-1531页

作者： LI Qian-yu WU Jing-lu ZHAO Zhong-hua SAKIEV Kadyrbek State Key Laboratory of Lake Science and Environment Research Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing 210008 China Ecology and Environment of CentraIAsia Chinese Academy of Sciences Urumqi 830011 China University of Chinese Academy of Sciences Beijing 100039 China Institute of Geology National Academy of Sciences Bishkek 720001 Kyrgyz Republic

As organchlorine pesticides(OCPs) may be an ecologic threat to mountain environments due to their tendency to deposit and accumulate in mountain regions undergoing long-range air transport, OCPs were analyzed in soils collected from an intermontane basin of the western Tian Shan Mountains, which is the UNESCO protected natural reserve of Issyk-Kul. Total OCP concentrations in the Issyk-Kul region ranged from 4.63 to 414 ng/g dw, of which two extraordinary high OCP concentrations(414 ng/g dw and 213 ng/g dw, respectively) influenced by an abandoned dumping site and urban sewage, respectively, were found. Principal component analysis(PCA) and correlation analysis inferred that the OCP inputs in the east of the Issyk-Kul region were mainly from local endogenous sources, and exogenous input via LRAT processes were prominent in the west and south. Additionally, the isomeric and parent substance/metabolite ratios revealed most pesticides accumulated in this region were from old usage, while DDTs had fresh input because of possibly illegal regional application and a slow degradation from the dumping site. Furthermore, ecological risk assessment revealed that no frequently adverse ecological effects were observed in the Issyk-Kul region, but potential risks on neighbouring organisms induced by p,p'-DDT and γ-HCH in dumping site and urban sewage should be considered when devising an efficient management plan to prevent secondary pollution.

关键词： organchlorine pesticides Pesticide distribution Pesticide sources Ecological risks Issyk-Kul region Tian Shan Mountains

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