LrgpV1, Main, Exploration, bibRecord, 001337

Lumbricid macrofauna alter atrazine mineralization and sorption in a silt loam soil

Identifieur interne : 001337 ( Main/Exploration ); précédent : 001336; suivant : 001338

Lumbricid macrofauna alter atrazine mineralization and sorption in a silt loam soil

Auteurs : Francoise Binet [France] ; Anne Kersante [France] ; Colette Munier-Lamy [France] ; Renée-Claire Le Bayon [Suisse] ; Marie-José Belgy [France] ; Martin J. Shipitalo [États-Unis]

Source :

Soil biology & biochemistry [ 0038-0717 ] ; 2006.

RBID : Pascal:06-0285209

Descripteurs français

Pascal (Inist)
- Macrofaune, Minéralisation, Sorption, Dégradation, Science du sol, Ver de terre, Atrazine, Herbicide, Sol limoneux fin.
Wicri :
- topic : Herbicide.

English descriptors

KwdEn :
- Atrazine, Degradation, Earthworm, Herbicide, Macrofauna, Mineralization, Silt loam soil, Soil science, Sorption.

Abstract

Atrazine is a widely used herbicide and is often a contaminant in terrestrial and freshwater ecosystems. It is uncertain, however, how the activity of soil macrofauna affects atrazine fate and transport. Therefore, we investigated whether earthworms enhance atrazine biodegradation by stimulating herbicide degrading soil microflora, or if they increase atrazine persistence by facilitating herbicide sorption. Short (43 d) and medium term (86 d) effects of the earthworms Lumbricus terrestris and Aporrectodea caliginosa on mineralization, distribution, and sorption of U-ring-¹⁴C atrazine and on soil C mineralization was quantified in packed-soil microcosms using silt loam soil. A priming effect (stimulation of soil C mineralization) caused by atrazine supply was shown that likely lowered the earthworm net effect on soil C mineralization in atrazine-treated soil microcosms. Although earthworms significantly increased soil microbial activity, they reduced atrazine mineralization to ¹⁴CO₂-C from 15.2 to 11.7% at 86 d. Earthworms facilitated formation of non-extractable atrazine residues within C-rich soil microsites that they created by burrowing and ingesting soil and organic matter. Atrazine sorption was highest in their gut contents and higher in casts than in burrow linings. Also, gut contents exhibited the highest formation of bound atrazine residues (non-extractable atrazine). Earthworms also promoted a deeper and patchier distribution of atrazine in the soil. This contributed to greater leaching losses of atrazine in microcosms amended with earthworms (3%) than in earthworm-free microcosms (0.003%), although these differences were not significant due to high variability in transport from earthworm-amended microcosms. Our results indicated that earthworms, mainly by casting activity, facilitated atrazine sorption, which increased atrazine persistence. As a consequence, this effect overrode any increase in atrazine biodegradation due to stimulation of microbial activity by earthworms. It is concluded that the affect of earthworms of atrazine mineralization is time-dependent, mineralization being slightly enhanced in the short term and subsequently reduced in the medium term.

Affiliations:

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Le document en format XML

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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Atrazine</term>
<term>Degradation</term>
<term>Earthworm</term>
<term>Herbicide</term>
<term>Macrofauna</term>
<term>Mineralization</term>
<term>Silt loam soil</term>
<term>Soil science</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Macrofaune</term>
<term>Minéralisation</term>
<term>Sorption</term>
<term>Dégradation</term>
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<term>Ver de terre</term>
<term>Atrazine</term>
<term>Herbicide</term>
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<front><div type="abstract" xml:lang="en">Atrazine is a widely used herbicide and is often a contaminant in terrestrial and freshwater ecosystems. It is uncertain, however, how the activity of soil macrofauna affects atrazine fate and transport. Therefore, we investigated whether earthworms enhance atrazine biodegradation by stimulating herbicide degrading soil microflora, or if they increase atrazine persistence by facilitating herbicide sorption. Short (43 d) and medium term (86 d) effects of the earthworms Lumbricus terrestris and Aporrectodea caliginosa on mineralization, distribution, and sorption of U-ring-<sup>14</sup>
C atrazine and on soil C mineralization was quantified in packed-soil microcosms using silt loam soil. A priming effect (stimulation of soil C mineralization) caused by atrazine supply was shown that likely lowered the earthworm net effect on soil C mineralization in atrazine-treated soil microcosms. Although earthworms significantly increased soil microbial activity, they reduced atrazine mineralization to <sup>14</sup>
CO<sub>2</sub>
-C from 15.2 to 11.7% at 86 d. Earthworms facilitated formation of non-extractable atrazine residues within C-rich soil microsites that they created by burrowing and ingesting soil and organic matter. Atrazine sorption was highest in their gut contents and higher in casts than in burrow linings. Also, gut contents exhibited the highest formation of bound atrazine residues (non-extractable atrazine). Earthworms also promoted a deeper and patchier distribution of atrazine in the soil. This contributed to greater leaching losses of atrazine in microcosms amended with earthworms (3%) than in earthworm-free microcosms (0.003%), although these differences were not significant due to high variability in transport from earthworm-amended microcosms. Our results indicated that earthworms, mainly by casting activity, facilitated atrazine sorption, which increased atrazine persistence. As a consequence, this effect overrode any increase in atrazine biodegradation due to stimulation of microbial activity by earthworms. It is concluded that the affect of earthworms of atrazine mineralization is time-dependent, mineralization being slightly enhanced in the short term and subsequently reduced in the medium term.</div>
</front>
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<affiliations><list><country><li>France</li>
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<settlement><li>Nancy</li>
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<tree><country name="France"><region name="Région Bretagne"><name sortKey="Binet, Francoise" sort="Binet, Francoise" uniqKey="Binet F" first="Francoise" last="Binet">Francoise Binet</name>
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<name sortKey="Belgy, Marie Jose" sort="Belgy, Marie Jose" uniqKey="Belgy M" first="Marie-José" last="Belgy">Marie-José Belgy</name>
<name sortKey="Kersante, Anne" sort="Kersante, Anne" uniqKey="Kersante A" first="Anne" last="Kersante">Anne Kersante</name>
<name sortKey="Munier Lamy, Colette" sort="Munier Lamy, Colette" uniqKey="Munier Lamy C" first="Colette" last="Munier-Lamy">Colette Munier-Lamy</name>
</country>
<country name="Suisse"><region name="Canton de Neuchâtel"><name sortKey="Le Bayon, Renee Claire" sort="Le Bayon, Renee Claire" uniqKey="Le Bayon R" first="Renée-Claire" last="Le Bayon">Renée-Claire Le Bayon</name>
</region>
</country>
<country name="États-Unis"><region name="Ohio"><name sortKey="Shipitalo, Martin J" sort="Shipitalo, Martin J" uniqKey="Shipitalo M" first="Martin J." last="Shipitalo">Martin J. Shipitalo</name>
</region>
</country>
</tree>
</affiliations>
</record>

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Lumbricid macrofauna alter atrazine mineralization and sorption in a silt loam soil

Lumbricid macrofauna alter atrazine mineralization and sorption in a silt loam soil

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri