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首页> 外文会议>International symposium on halogenated persistent organic pollutants >SOME PRELIMINARY STUDIES ON RESIDUAL OF DIOXIN (2,3,7,8-TCDD) USED IN VIETNAM WAR AT VIETNAM-LAOS BORDER (KONTUM-QUANGNAM PROVINCES AND LONGTERM EFFECTS OF DIOXIN INTO NATURAL ECOSYSTEMS AND BIODIVERSITY IN THIS AREA
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SOME PRELIMINARY STUDIES ON RESIDUAL OF DIOXIN (2,3,7,8-TCDD) USED IN VIETNAM WAR AT VIETNAM-LAOS BORDER (KONTUM-QUANGNAM PROVINCES AND LONGTERM EFFECTS OF DIOXIN INTO NATURAL ECOSYSTEMS AND BIODIVERSITY IN THIS AREA

机译：越南 - 老挝边境越南战争中二恶英（2,3,7,8-TCDD）残余研究（Kontum-Quangnam省和Dioxin的Longterm expersy在本领域的自然生态系统和生物多样性

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摘要

Up to now, more than 40 years ago after the end of the sprayed operation, soil in the Vietnam-Laos border (Kontum-Quangnam provinces), particularly in the Charly range and adjaction area are polluted by dioxin. Analytic results of dioxin residual in samples of soil, stream sediment collected in late June and early July 2008 show that concentrations of 2,3,7,8 TCDD ranged from 106.57 to 845.48 ppt (ng/kg drying soil). These concentrations of 2,3,7,8-TCDD are lower than the permissible level for non-agricultural soil of the US Environmental Protection Agency (USEPA) being 1,000 ppt, but higher than the permissible level for agricultural soil (27 ppt). Concentrations of 2,3,7,8-TCDD in soil are higher than stream sediment. In 2008, preliminary research results show that hebicides used in the war have caused long term impacts into natural ecosystems and biodiversity of this area. The natural vegetation in Charly range before spraying is primary forest, with abundant and storied forest but can not rehabilitated, and now only grasses, bushes occurred. A such degraded forest vegetation, species composition and quantity of small size mammal belonging to Chidoptera and Rodentia orders in the Charly range are lower than unsprayed other area with the same landscape (Chu Mom Ray range). Biodiverse index (Shannon index-H') of various animal groups in this area is also lower than unsprayed area: Average value H' of fishes of streams in the Charly valley 0.9340, lower than H' value of fishes in streams of unsprayed areas (1.1561-1.2738); H' value of insects in the Charly range fluctuated 1.7544-4.3803, lower than unsprayed areas (2.8791-4.6697).
机译：截至目前，40多年前在喷涂操作结束后，越南 - 老挝边境（Kontum-Quangnam省）的土壤，特别是在Chyly系列和邻接区域被二恶英污染。 2008年6月下旬和7月初收集土壤样品的二恶英残留的分析结果表明，2,3,7,8 TCDD的浓度为106.57至845.48 ppt（Ng / kg干燥土）。这些浓度为2,3,7,8-TCDD低于美国环境保护局（USEPA）的非农业土壤的允许水平为1,000个PPT，但高于农业土壤允许的水平（27 PPT）。土壤中2,3,7,8-TCDD的浓度高于流沉积物。 2008年，初步研究结果表明，战争中使用的Hybicides造成了长期影响了这一领域的自然生态系统和生物多样性。喷洒前的近距离植被的自然植被是原发性森林，森林丰富，森林，但无法恢复，现在只有草，灌木丛。这种降解的森林植被，属于Chidoptera和Chidenta和啮齿动物的小尺寸哺乳动物的物种组成和数量低于带有相同景观（Chu Mom Ray Range）的非喷雾器。该地区各种动物群体的生物多样性指数（Shannon Index-H'）也低于Charly Valley的溪流中的鱼类鱼类的平均值H'，低于未喷发区域的鱼类的鱼类（ 1.1561-1.2738）; H'昆虫的价值在Chyly范围波动波动1.7544-4.3803，低于未喷雾的区域（2.8791-4.6697）。

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