Accumulation of Current-Use Pesticides in Neotropical Montane Forests

GILLIAN L.DALY; YING D.LEI; CAMILLA TEIXEIRA

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Accumulation of Current-Use Pesticides in Neotropical Montane Forests

机译：Accumulation of Current-Use Pesticides in Neotropical Montane Forests

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In Central America,chemical-intensive tropical agriculture takes place in close proximity to highly valued and biologically diverse ecosystems,yet the potential for atmospheric transport of pesticides from plantations to national parks and other reserves is poorly characterized.The specific meteorological conditions of mountain ranges can lead to contaminant convergence at high altitudes,raising particular concern for montane forest ecosystems downwind from pesticide use areas.Here we show,based on a wide-ranging air and soil sampling campaign across Costa Rica,that soils in some neotropical montane forests indeed display much higher concentrations of currently used pesticides than soils elsewhere in the country.Specifically,elevated concentrations of the fungicide chlorothalonil,the herbicide dacthal,and the insecticide metabolite endosulfan sulfate on volcanoes Barva and Poas,lying directly downwind of the extensive banana plantations of the Caribbean lowland,indicate the occurrence of atmospheric transport and wet deposition of pesticides at high altitudes.Calculations with a contaminant fate model,designed for mountain regions and parametrized to the Costa Rican environment,show that chemicals with a log K_(AW) between -3 and -5 have a greater potential for accumulation at high altitudes.This enrichment behavior is quantified by the Mountain Contamination Potential and is sensitive to contaminant degradability.The modeling work supports the hypothesis suggested by the field results that it is enhanced precipitation scavenging at high elevations (caused by lower temperatures and governed by K_(AW)) that causes pesticides to accumulate in tropical montane areas.By providing for the first time evidence of significant transfer of currently used pesticides to Central American montane cloud forests,this study highlights the need to evaluate the risk that tropical agricultural practices place on the region's ecological reserves.

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《Environmental Science & Technology: ES&T》 |2007年第4期|1118-1123|共6页
作者
GILLIAN L.DALY; YING D.LEI; CAMILLA TEIXEIRA;
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作者单位

Departments of Chemistry and Physical and Environmental Sciences,University of Toronto at Scarborough,1265 Military Trail,Toronto,Ontario,Canada MIC 1A4,Aquatic Ecosystem Protection Research Division,Environment Canada,867 Lakeshore Road,Burlington,O;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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正文语种英语
中图分类环境化学;
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Accumulation of Current-Use Pesticides in Neotropical Montane Forests

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