Rémi Bizeul, Oriane Lajoie, Olivier Cerdan, Lai Ting Pak, Anthony Foucher, Sylvain Huon, Thomas Grangeon, Olivier Evrard
{"title":"Delayed environmental pollution caused by transient landscape storage - An example from the Lesser Antilles","authors":"Rémi Bizeul, Oriane Lajoie, Olivier Cerdan, Lai Ting Pak, Anthony Foucher, Sylvain Huon, Thomas Grangeon, Olivier Evrard","doi":"10.1016/j.envpol.2024.125412","DOIUrl":null,"url":null,"abstract":"The strong pest pressure on intensive banana cultivation in the French West Indies led to the intensive use of chlordecone (an organochlorine insecticide) between 1972 and 1993. Due to its high toxicity for the population and the environment, many studies were conducted on the transfer of chlordecone over the last 20 years. However, most studies focused on the dissolved fraction of chlordecone, while the particle-bound fraction was understudied. Therefore, this study reconstructs pluri-decadal erosion rates (<span><span style=\"\"></span><span data-mathml='<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow is=\"true\"><mi is=\"true\">i</mi><mo is=\"true\">.</mo><mi is=\"true\">e</mi><mo is=\"true\">.</mo></mrow></math>' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"><svg aria-hidden=\"true\" focusable=\"false\" height=\"1.971ex\" role=\"img\" style=\"vertical-align: -0.235ex;\" viewbox=\"0 -747.2 1535.7 848.5\" width=\"3.567ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><g is=\"true\"><g is=\"true\"><use xlink:href=\"#MJMATHI-69\"></use></g><g is=\"true\" transform=\"translate(345,0)\"><use xlink:href=\"#MJMAIN-2E\"></use></g><g is=\"true\" transform=\"translate(790,0)\"><use xlink:href=\"#MJMATHI-65\"></use></g><g is=\"true\" transform=\"translate(1257,0)\"><use xlink:href=\"#MJMAIN-2E\"></use></g></g></g></svg><span role=\"presentation\"><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow is=\"true\"><mi is=\"true\">i</mi><mo is=\"true\">.</mo><mi is=\"true\">e</mi><mo is=\"true\">.</mo></mrow></math></span></span><script type=\"math/mml\"><math><mrow is=\"true\"><mi is=\"true\">i</mi><mo is=\"true\">.</mo><mi is=\"true\">e</mi><mo is=\"true\">.</mo></mrow></math></script></span> 1980-2023) and associated chlordecone particle-bound transfers from soil and sediment cores sampled in a cultivated headwater catchment (Saint-Esprit, Martinique). Based on sediment accumulation analysis in an agricultural reservoir, high erosion rates (<span><span style=\"\"></span><span data-mathml='<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow is=\"true\"><mi is=\"true\">i</mi><mo is=\"true\">.</mo><mi is=\"true\">e</mi><mo is=\"true\">.</mo></mrow></math>' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"><svg aria-hidden=\"true\" focusable=\"false\" height=\"1.971ex\" role=\"img\" style=\"vertical-align: -0.235ex;\" viewbox=\"0 -747.2 1535.7 848.5\" width=\"3.567ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><g is=\"true\"><g is=\"true\"><use xlink:href=\"#MJMATHI-69\"></use></g><g is=\"true\" transform=\"translate(345,0)\"><use xlink:href=\"#MJMAIN-2E\"></use></g><g is=\"true\" transform=\"translate(790,0)\"><use xlink:href=\"#MJMATHI-65\"></use></g><g is=\"true\" transform=\"translate(1257,0)\"><use xlink:href=\"#MJMAIN-2E\"></use></g></g></g></svg><span role=\"presentation\"><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow is=\"true\"><mi is=\"true\">i</mi><mo is=\"true\">.</mo><mi is=\"true\">e</mi><mo is=\"true\">.</mo></mrow></math></span></span><script type=\"math/mml\"><math><mrow is=\"true\"><mi is=\"true\">i</mi><mo is=\"true\">.</mo><mi is=\"true\">e</mi><mo is=\"true\">.</mo></mrow></math></script></span> 10 t ha<sup>−1</sup> yr<sup>−1</sup>) were found in the investigated catchment during the study period, with values exceeding the estimated tolerable soil loss rate in tropical context (<span><span style=\"\"></span><span data-mathml='<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow is=\"true\"><mi is=\"true\">i</mi><mo is=\"true\">.</mo><mi is=\"true\">e</mi><mo is=\"true\">.</mo></mrow></math>' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"><svg aria-hidden=\"true\" focusable=\"false\" height=\"1.971ex\" role=\"img\" style=\"vertical-align: -0.235ex;\" viewbox=\"0 -747.2 1535.7 848.5\" width=\"3.567ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><g is=\"true\"><g is=\"true\"><use xlink:href=\"#MJMATHI-69\"></use></g><g is=\"true\" transform=\"translate(345,0)\"><use xlink:href=\"#MJMAIN-2E\"></use></g><g is=\"true\" transform=\"translate(790,0)\"><use xlink:href=\"#MJMATHI-65\"></use></g><g is=\"true\" transform=\"translate(1257,0)\"><use xlink:href=\"#MJMAIN-2E\"></use></g></g></g></svg><span role=\"presentation\"><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow is=\"true\"><mi is=\"true\">i</mi><mo is=\"true\">.</mo><mi is=\"true\">e</mi><mo is=\"true\">.</mo></mrow></math></span></span><script type=\"math/mml\"><math><mrow is=\"true\"><mi is=\"true\">i</mi><mo is=\"true\">.</mo><mi is=\"true\">e</mi><mo is=\"true\">.</mo></mrow></math></script></span> 2.2 t ha<sup>−1</sup> yr<sup>−1</sup>). Based on the analysis of soil cores sampled along a banana plantation hillslope, this study highlights the formation of colluvial deposits with high levels of chlordecone contamination. When these areas are affected by erosion processes, this leads to massive remobilization of particle-bound chlordecone to water bodies. Indeed, in sediment sampled in the downstream reservoir, we observed a drastic increase in these transfers since 2006, synchronous with changes in agricultural practices. This study therefore highlighted the occurrence of legacy contamination at toeslope positions, which was estimated to potentially persist for 4000 to 11,000 years. Such a residence time highlights the need to implement changes in land management to effectively reduce agricultural soils erosion, particularly in areas identified as ”temporary deposition zones” for chlordecone contamination, in order to protect downstream water bodies from chlordecone transfer. To achieve this, agricultural practices that may increase soil erosion, such as herbicide application or intensive ploughing, should be minimized. Overall, this study improved our understanding of erosion and associated chlordecone transfers in tropical environments.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"27 1","pages":""},"PeriodicalIF":7.6000,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Environmental Pollution","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1016/j.envpol.2024.125412","RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
引用次数: 0
Abstract
The strong pest pressure on intensive banana cultivation in the French West Indies led to the intensive use of chlordecone (an organochlorine insecticide) between 1972 and 1993. Due to its high toxicity for the population and the environment, many studies were conducted on the transfer of chlordecone over the last 20 years. However, most studies focused on the dissolved fraction of chlordecone, while the particle-bound fraction was understudied. Therefore, this study reconstructs pluri-decadal erosion rates ( 1980-2023) and associated chlordecone particle-bound transfers from soil and sediment cores sampled in a cultivated headwater catchment (Saint-Esprit, Martinique). Based on sediment accumulation analysis in an agricultural reservoir, high erosion rates ( 10 t ha−1 yr−1) were found in the investigated catchment during the study period, with values exceeding the estimated tolerable soil loss rate in tropical context ( 2.2 t ha−1 yr−1). Based on the analysis of soil cores sampled along a banana plantation hillslope, this study highlights the formation of colluvial deposits with high levels of chlordecone contamination. When these areas are affected by erosion processes, this leads to massive remobilization of particle-bound chlordecone to water bodies. Indeed, in sediment sampled in the downstream reservoir, we observed a drastic increase in these transfers since 2006, synchronous with changes in agricultural practices. This study therefore highlighted the occurrence of legacy contamination at toeslope positions, which was estimated to potentially persist for 4000 to 11,000 years. Such a residence time highlights the need to implement changes in land management to effectively reduce agricultural soils erosion, particularly in areas identified as ”temporary deposition zones” for chlordecone contamination, in order to protect downstream water bodies from chlordecone transfer. To achieve this, agricultural practices that may increase soil erosion, such as herbicide application or intensive ploughing, should be minimized. Overall, this study improved our understanding of erosion and associated chlordecone transfers in tropical environments.
期刊介绍:
Environmental Pollution is an international peer-reviewed journal that publishes high-quality research papers and review articles covering all aspects of environmental pollution and its impacts on ecosystems and human health.
Subject areas include, but are not limited to:
• Sources and occurrences of pollutants that are clearly defined and measured in environmental compartments, food and food-related items, and human bodies;
• Interlinks between contaminant exposure and biological, ecological, and human health effects, including those of climate change;
• Contaminants of emerging concerns (including but not limited to antibiotic resistant microorganisms or genes, microplastics/nanoplastics, electronic wastes, light, and noise) and/or their biological, ecological, or human health effects;
• Laboratory and field studies on the remediation/mitigation of environmental pollution via new techniques and with clear links to biological, ecological, or human health effects;
• Modeling of pollution processes, patterns, or trends that is of clear environmental and/or human health interest;
• New techniques that measure and examine environmental occurrences, transport, behavior, and effects of pollutants within the environment or the laboratory, provided that they can be clearly used to address problems within regional or global environmental compartments.