喜马拉雅山脉尼泊尔南坡地区有机氯化合物的大气传输和积累。
Atmospheric transport and accumulation of organochlorine compounds on the southern slopes of the Himalayas, Nepal.
机构信息
Key Laboratory of Tibetan Environmental Changes and Land Surface Process, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100101, China.
Key Laboratory of Tibetan Environmental Changes and Land Surface Process, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100101, China.
出版信息
Environ Pollut. 2014 Sep;192:44-51. doi: 10.1016/j.envpol.2014.05.015. Epub 2014 Jun 2.
Studies have been devoted to the transport and accumulation of persistent organic pollutants (POPs) in mountain environments. The Himalayas have the widest altitude gradient of any mountain range, but few studies examining the environmental behavior of POPs have been performed in the Himalayas. In this study, air, soil, and leaf samples were collected along a transect on the southern slope of the Himalayas, Nepal (altitude: 135-5100 m). Local emission occurred in the lowlands, and POPs were transported by uplift along the slope. During the atmospheric transport, the HCB proportion increased from the lowlands (20%) to high elevation (>50%), whereas the proportions of DDTs decreased. The largest residue of soil POPs appeared at an altitude of approximately 2500 m, and may be related to absorption by vegetation and precipitation. The net deposition tendencies at the air-soil surface indicated that the Himalayas may be a 'sink' for DDTs and PCBs.
已有研究致力于持久性有机污染物（POPs）在山地环境中的传输和积累。喜马拉雅山脉是所有山脉中海拔梯度最宽的，但关于 POPs 在喜马拉雅山脉的环境行为的研究却很少。在这项研究中，沿尼泊尔喜马拉雅山脉南坡的一条横断线上采集了空气、土壤和叶片样本（海拔：135-5100 m）。当地在低海拔地区排放污染物，POPs 沿山坡抬升输送。在大气传输过程中，六氯环己烷（HCB）的比例从低地（20%）增加到高海拔（>50%），而滴滴涕（DDTs）的比例则降低。土壤中 POPs 的最大残留量出现在约 2500 m 的海拔高度，这可能与植被吸收和降水有关。空气-土壤表面的净沉积趋势表明，喜马拉雅山脉可能是滴滴涕（DDTs）和多氯联苯（PCBs）的“汇”。
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