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Effect of microplastics on organic matter decomposition in paddy soil amended with crop residues and labile C: A three-source-partitioning study

Xiao, Mouliang ; Shahbaz, Muhammad LU ; Liang, Yun ; Yang, Jian ; Wang, Shuang ; Chadwicka, David R. ; Jones, Davey ; Chen, Jianping and Ge, Tida (2021) In Journal of Hazardous Materials 416.
Abstract
Microplastics (MPs) are a widespread pollutant in terrestrial ecosystems. However, knowledge on how MPs impact soil organic matter (SOM) decomposition and the priming effect (PE) in rice paddy soil remains limited. By employing a three-source-partitioning approach, we investigated the interactive impact of MP dosage (none, low [0.01% w/w] or high [1% w/w]), labile C (14C-labeled glucose), and 13C-labeled rice straw addition on SOM decomposition and PE. Compared to soil without C addition (i.e., control), total SOM-derived CO2 in low-MP soil declined by 13.2% and 7.1% after straw and glucose addition, respectively. Under combined glucose and rice straw addition, glucose-induced PE was up to 10 times stronger in the presence of low-MPs... (More)
Microplastics (MPs) are a widespread pollutant in terrestrial ecosystems. However, knowledge on how MPs impact soil organic matter (SOM) decomposition and the priming effect (PE) in rice paddy soil remains limited. By employing a three-source-partitioning approach, we investigated the interactive impact of MP dosage (none, low [0.01% w/w] or high [1% w/w]), labile C (14C-labeled glucose), and 13C-labeled rice straw addition on SOM decomposition and PE. Compared to soil without C addition (i.e., control), total SOM-derived CO2 in low-MP soil declined by 13.2% and 7.1% after straw and glucose addition, respectively. Under combined glucose and rice straw addition, glucose-induced PE was up to 10 times stronger in the presence of low-MPs compared to that in high-MPs. However, glucose induced negative PE on rice straw decomposition in the presence of MPs. SOM decomposition was much higher under low MP dosage than under high MP dosage. However, MPs had a negligible effect on the mineralization of exogenous C substrate (glucose or straw). This study provides a novel and valuable insight on how MPs affect SOM turnover and C sequestration in paddy soil, highlighting the significance of interactions between environmental pollutants and biogeochemical processes that affect CO2 fluxes. (Less)
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author
; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Hazardous Materials
volume
416
article number
126221
publisher
Elsevier
external identifiers
  • scopus:85107143637
  • pmid:34492976
ISSN
0304-3894
DOI
10.1016/j.jhazmat.2021.126221
language
English
LU publication?
yes
id
f3d3c355-13be-459e-ace2-4cba6712ee1c
date added to LUP
2021-05-29 13:58:35
date last changed
2022-04-27 02:08:57
@article{f3d3c355-13be-459e-ace2-4cba6712ee1c,
  abstract     = {{Microplastics (MPs) are a widespread pollutant in terrestrial ecosystems. However, knowledge on how MPs impact soil organic matter (SOM) decomposition and the priming effect (PE) in rice paddy soil remains limited. By employing a three-source-partitioning approach, we investigated the interactive impact of MP dosage (none, low [0.01% w/w] or high [1% w/w]), labile C (14C-labeled glucose), and 13C-labeled rice straw addition on SOM decomposition and PE. Compared to soil without C addition (i.e., control), total SOM-derived CO2 in low-MP soil declined by 13.2% and 7.1% after straw and glucose addition, respectively. Under combined glucose and rice straw addition, glucose-induced PE was up to 10 times stronger in the presence of low-MPs compared to that in high-MPs. However, glucose induced negative PE on rice straw decomposition in the presence of MPs. SOM decomposition was much higher under low MP dosage than under high MP dosage. However, MPs had a negligible effect on the mineralization of exogenous C substrate (glucose or straw). This study provides a novel and valuable insight on how MPs affect SOM turnover and C sequestration in paddy soil, highlighting the significance of interactions between environmental pollutants and biogeochemical processes that affect CO2 fluxes.}},
  author       = {{Xiao, Mouliang and Shahbaz, Muhammad and Liang, Yun and Yang, Jian and Wang, Shuang and Chadwicka, David R. and Jones, Davey and Chen, Jianping and Ge, Tida}},
  issn         = {{0304-3894}},
  language     = {{eng}},
  month        = {{08}},
  publisher    = {{Elsevier}},
  series       = {{Journal of Hazardous Materials}},
  title        = {{Effect of microplastics on organic matter decomposition in paddy soil amended with crop residues and labile C: A three-source-partitioning study}},
  url          = {{http://dx.doi.org/10.1016/j.jhazmat.2021.126221}},
  doi          = {{10.1016/j.jhazmat.2021.126221}},
  volume       = {{416}},
  year         = {{2021}},
}