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Cadmium pollution alters earthworm activity and thus leaf-litter decomposition and soil properties.

Identifieur interne : 000532 ( Main/Exploration ); précédent : 000531; suivant : 000533

Cadmium pollution alters earthworm activity and thus leaf-litter decomposition and soil properties.

Auteurs : Change Liu [République populaire de Chine] ; Changqun Duan [République populaire de Chine] ; Xianghuai Meng [République populaire de Chine] ; Minhui Yue [République populaire de Chine] ; Hao Zhang [République populaire de Chine] ; Peng Wang [République populaire de Chine] ; Yanlan Xiao [République populaire de Chine] ; Zhiyong Hou [République populaire de Chine] ; Yuanfeng Wang [République populaire de Chine] ; Ying Pan [République populaire de Chine]

Source :

RBID : pubmed:32866867

Abstract

It has been reported that heavy metal contamination can affect litter decomposition and soil properties through its impact on microbial communities. However, it is still unclear whether the expected changes in earthworm activities in responses to heavy metal contamination could affect these properties. Therefore, we quantified earthworm (Eisenia fetida) responses in survival rate to lethal cadmium (Cd) concentrations (0, 50, 100, 150, 200, 250, and 300 mg L-1), and in burrowing ability, physiological characteristics, and feeding rate (on poplar leaf litter) to sub-lethal Cd concentrations (0, 15, 30, and 45 mg kg-1). Finally, sub-lethal influences of Cd on the decomposition rate of poplar leaf litter and on soil properties were investigated in the present of E. fetida. The 12-, 24-, 36-, and 48-h LC50 of Cd for E. fetida were 276.0, 208.6, 192.6, 179.8 mg L-1, respectively. With increasing Cd concentration, malondialdehyde was stimulated, superoxide dismutase first increased and then decreased, while feeding rate, total borrowing length, and maximum burrowing depth consistently decreased. Consequently, leaf-litter decomposition rate and soil nutrient concentrations generally decreased with increasing Cd concentration. Our results indicate that, by affecting earthworm activities, Cd inhibited leaf-litter decomposition and led to the degradation of soil fertility. This study highlights the importance of earthworms in mediating soil functions under heavy metal stress.

DOI: 10.1016/j.envpol.2020.115410
PubMed: 32866867


Affiliations:


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<div type="abstract" xml:lang="en">It has been reported that heavy metal contamination can affect litter decomposition and soil properties through its impact on microbial communities. However, it is still unclear whether the expected changes in earthworm activities in responses to heavy metal contamination could affect these properties. Therefore, we quantified earthworm (Eisenia fetida) responses in survival rate to lethal cadmium (Cd) concentrations (0, 50, 100, 150, 200, 250, and 300 mg L
<sup>-1</sup>
), and in burrowing ability, physiological characteristics, and feeding rate (on poplar leaf litter) to sub-lethal Cd concentrations (0, 15, 30, and 45 mg kg
<sup>-1</sup>
). Finally, sub-lethal influences of Cd on the decomposition rate of poplar leaf litter and on soil properties were investigated in the present of E. fetida. The 12-, 24-, 36-, and 48-h LC
<sub>50</sub>
of Cd for E. fetida were 276.0, 208.6, 192.6, 179.8 mg L
<sup>-1</sup>
, respectively. With increasing Cd concentration, malondialdehyde was stimulated, superoxide dismutase first increased and then decreased, while feeding rate, total borrowing length, and maximum burrowing depth consistently decreased. Consequently, leaf-litter decomposition rate and soil nutrient concentrations generally decreased with increasing Cd concentration. Our results indicate that, by affecting earthworm activities, Cd inhibited leaf-litter decomposition and led to the degradation of soil fertility. This study highlights the importance of earthworms in mediating soil functions under heavy metal stress.</div>
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<AbstractText>It has been reported that heavy metal contamination can affect litter decomposition and soil properties through its impact on microbial communities. However, it is still unclear whether the expected changes in earthworm activities in responses to heavy metal contamination could affect these properties. Therefore, we quantified earthworm (Eisenia fetida) responses in survival rate to lethal cadmium (Cd) concentrations (0, 50, 100, 150, 200, 250, and 300 mg L
<sup>-1</sup>
), and in burrowing ability, physiological characteristics, and feeding rate (on poplar leaf litter) to sub-lethal Cd concentrations (0, 15, 30, and 45 mg kg
<sup>-1</sup>
). Finally, sub-lethal influences of Cd on the decomposition rate of poplar leaf litter and on soil properties were investigated in the present of E. fetida. The 12-, 24-, 36-, and 48-h LC
<sub>50</sub>
of Cd for E. fetida were 276.0, 208.6, 192.6, 179.8 mg L
<sup>-1</sup>
, respectively. With increasing Cd concentration, malondialdehyde was stimulated, superoxide dismutase first increased and then decreased, while feeding rate, total borrowing length, and maximum burrowing depth consistently decreased. Consequently, leaf-litter decomposition rate and soil nutrient concentrations generally decreased with increasing Cd concentration. Our results indicate that, by affecting earthworm activities, Cd inhibited leaf-litter decomposition and led to the degradation of soil fertility. This study highlights the importance of earthworms in mediating soil functions under heavy metal stress.</AbstractText>
<CopyrightInformation>Copyright © 2020 Elsevier Ltd. All rights reserved.</CopyrightInformation>
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<Affiliation>School of Life Science, Yunnan Normal University, Kunming, 650500, China.</Affiliation>
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<LastName>Wang</LastName>
<ForeName>Peng</ForeName>
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<Affiliation>School of Ecology and Environmental Sciences & Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments, Yunnan University, Kunming, Yunnan, 650091, China; School of Ecology and Environmental Sciences, Yunnan University, Kunming, 650091, China.</Affiliation>
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<ForeName>Zhiyong</ForeName>
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<Affiliation>Dongting Lake Station for Wetland Ecosystem Research, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha, 410125, China.</Affiliation>
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<LastName>Wang</LastName>
<ForeName>Yuanfeng</ForeName>
<Initials>Y</Initials>
<AffiliationInfo>
<Affiliation>School of Ecology and Environmental Sciences & Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments, Yunnan University, Kunming, Yunnan, 650091, China; School of Ecology and Environmental Sciences, Yunnan University, Kunming, 650091, China.</Affiliation>
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<LastName>Pan</LastName>
<ForeName>Ying</ForeName>
<Initials>Y</Initials>
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<Affiliation>School of Ecology and Environmental Sciences & Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments, Yunnan University, Kunming, Yunnan, 650091, China; School of Ecology and Environmental Sciences, Yunnan University, Kunming, 650091, China. Electronic address: panying@ynu.edu.cn.</Affiliation>
</AffiliationInfo>
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<PublicationType UI="D016428">Journal Article</PublicationType>
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<Year>2020</Year>
<Month>08</Month>
<Day>19</Day>
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<Country>England</Country>
<MedlineTA>Environ Pollut</MedlineTA>
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<Keyword MajorTopicYN="N">Burrowing behavior</Keyword>
<Keyword MajorTopicYN="N">Feeding rate</Keyword>
<Keyword MajorTopicYN="N">Heavy metal</Keyword>
<Keyword MajorTopicYN="N">Physiological adjustment</Keyword>
<Keyword MajorTopicYN="N">Soil nutrients</Keyword>
</KeywordList>
<CoiStatement>Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.</CoiStatement>
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<PubMedPubDate PubStatus="received">
<Year>2020</Year>
<Month>05</Month>
<Day>22</Day>
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<Year>2020</Year>
<Month>07</Month>
<Day>17</Day>
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<Year>2020</Year>
<Month>08</Month>
<Day>08</Day>
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<Month>9</Month>
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<PublicationStatus>aheadofprint</PublicationStatus>
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<ArticleId IdType="pubmed">32866867</ArticleId>
<ArticleId IdType="pii">S0269-7491(20)36098-X</ArticleId>
<ArticleId IdType="doi">10.1016/j.envpol.2020.115410</ArticleId>
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<affiliations>
<list>
<country>
<li>République populaire de Chine</li>
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<country name="République populaire de Chine">
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<name sortKey="Liu, Change" sort="Liu, Change" uniqKey="Liu C" first="Change" last="Liu">Change Liu</name>
</noRegion>
<name sortKey="Duan, Changqun" sort="Duan, Changqun" uniqKey="Duan C" first="Changqun" last="Duan">Changqun Duan</name>
<name sortKey="Hou, Zhiyong" sort="Hou, Zhiyong" uniqKey="Hou Z" first="Zhiyong" last="Hou">Zhiyong Hou</name>
<name sortKey="Meng, Xianghuai" sort="Meng, Xianghuai" uniqKey="Meng X" first="Xianghuai" last="Meng">Xianghuai Meng</name>
<name sortKey="Pan, Ying" sort="Pan, Ying" uniqKey="Pan Y" first="Ying" last="Pan">Ying Pan</name>
<name sortKey="Wang, Peng" sort="Wang, Peng" uniqKey="Wang P" first="Peng" last="Wang">Peng Wang</name>
<name sortKey="Wang, Yuanfeng" sort="Wang, Yuanfeng" uniqKey="Wang Y" first="Yuanfeng" last="Wang">Yuanfeng Wang</name>
<name sortKey="Xiao, Yanlan" sort="Xiao, Yanlan" uniqKey="Xiao Y" first="Yanlan" last="Xiao">Yanlan Xiao</name>
<name sortKey="Yue, Minhui" sort="Yue, Minhui" uniqKey="Yue M" first="Minhui" last="Yue">Minhui Yue</name>
<name sortKey="Zhang, Hao" sort="Zhang, Hao" uniqKey="Zhang H" first="Hao" last="Zhang">Hao Zhang</name>
</country>
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