Vol15 No.7: 1520-1531
【Title】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
【Author】LI Qian-yu1,3; WU Jing-lu1,2*; ZHAO Zhong-hua1; SAKIEV Kadyrbek4
【Addresses】1 State Key Laboratory of Lake Science and Environment Research, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; 2 Ecology and Environment of Central Asia, Chinese Academy of Sciences, Urumqi 830011, China; 3 University of Chinese Academy of Sciences, Beijing 100039, China; 4 Institute of Geology, National Academy of Sciences, Bishkek 720001, Kyrgyz Republic
【Corresponding author】WU Jing-lu
【Citation】Li QY, Wu JL, Zhao ZH, et al. (2018) 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. Journal of Mountain Science 15(7). https://doi.org/10.1007/s11629-018-4963-9
【Abstract】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 revealedmost pesticides accumulated in this region were from old usage, while DDTs had fresh input because ofpossibly illegal regional application and a slow degradation fromthe dumping site. Furthermore,ecological risk assessment revealed thatno 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.
【Keywords】Organchlorine pesticides; Pesticide distribution; Pesticide sources; Ecological risks; Issyk-Kul region; Tian Shan Mountains