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Microbial functional diversity and carbon use feedback in soils as affected by heavy metals

Yilu Xu, Balaji Seshadri, Nanthi Bolan, Binoy Sarkar, Yong Sik Ok, Wei Zhang Orcid Logo, Cornelia Rumpel, Donald Sparks, Mark Farrell, Tony Hall, Zhaomin Dong

Environment International, Volume: 125, Pages: 478 - 488

Swansea University Author: Wei Zhang Orcid Logo

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DOI (Published version): 10.1016/j.envint.2019.01.071

Abstract

Soil microorganisms are an important indicator of soil fertility and health. However, our state of knowledge about soil microbial activities, community compositions and carbon use patterns under metal contaminations is still poor. This study aimed to evaluate the influences of heavy metals (Cd and P...

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Published in: Environment International
ISSN: 0160-4120
Published: 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa48903
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spelling 2020-06-16T15:45:16.0186169 v2 48903 2019-02-19 Microbial functional diversity and carbon use feedback in soils as affected by heavy metals 3ddabbb54b2cfa2ea10f590ea7da6520 0000-0003-3129-2918 Wei Zhang Wei Zhang true false 2019-02-19 CHEG Soil microorganisms are an important indicator of soil fertility and health. However, our state of knowledge about soil microbial activities, community compositions and carbon use patterns under metal contaminations is still poor. This study aimed to evaluate the influences of heavy metals (Cd and Pb) on soil microorganisms by investigating the microbial community composition and carbon use preferences. Metal pollution was approached both singly and jointly with low (25 and 2500 mg kg−1) and high (50 and 5000 mg kg−1) concentrations of Cd and Pb, respectively, in an artificially contaminated soil. In a laboratory incubation experiment, bio-available and potentially bio-available metal concentrations, selected soil properties (pH, electrical conductivity, total organic carbon and total nitrogen), and microbial parameters (microbial activity as basal respiration, microbial biomass carbon (MBC) and microbial functional groups) were determined at two sampling occasions (7 and 49 days). Metal contamination had no effect on the selected soil properties, while it significantly inhibited both microbial activity and MBC formation. Contaminated soils had higher microbial quotient (qCO2), suggesting there was higher energy demand with less microbially immobilized carbon as MBC. Notably, the efficiency of microbial carbon use was repressed as the metal concentration increased, yet no difference was observed between metal types (p &#62; 0.05). Based on the microbial phospholipid fatty acids (PLFA) analysis, total PLFAs decreased significantly under metal stress at the end of incubation. Heavy metals had a greater negative influence on the fungal population than bacteria with respective 5–35 and 8–32% fall in abundances. The contaminant-driven (metal concentrations and types) variation of soil PLFA biomarkers demonstrated that the heavy metals led to the alteration of soil microbial community compositions and their activities, which consequently had an adverse impact on soil microbial carbon immobilization. Journal Article Environment International 125 478 488 0160-4120 Heavy metals, Soil organic carbon, Microbial carbon decomposition, Microbial activity, Microbial community composition, PLFAs 30 4 2019 2019-04-30 10.1016/j.envint.2019.01.071 COLLEGE NANME Chemical Engineering COLLEGE CODE CHEG Swansea University 2020-06-16T15:45:16.0186169 2019-02-19T09:52:53.0325222 Yilu Xu 1 Balaji Seshadri 2 Nanthi Bolan 3 Binoy Sarkar 4 Yong Sik Ok 5 Wei Zhang 0000-0003-3129-2918 6 Cornelia Rumpel 7 Donald Sparks 8 Mark Farrell 9 Tony Hall 10 Zhaomin Dong 11 0048903-07032019142221.pdf xu2019v2.pdf 2019-03-07T14:22:21.1670000 Output 5826646 application/pdf Version of Record true 2019-03-07T00:00:00.0000000 true eng 48903__17497__c07c1043e35e4b93bc77a040e72da04e.pdf 48903.pdf 2020-06-15T14:35:03.3424556 Output 1057190 application/pdf Version of Record true Distributed under the terms of a Creative Commons CC-BY-NC-ND 4.0 Licence. true eng https://creativecommons.org/licenses/by-nc-nd/4.0/
title Microbial functional diversity and carbon use feedback in soils as affected by heavy metals
spellingShingle Microbial functional diversity and carbon use feedback in soils as affected by heavy metals
Wei Zhang
title_short Microbial functional diversity and carbon use feedback in soils as affected by heavy metals
title_full Microbial functional diversity and carbon use feedback in soils as affected by heavy metals
title_fullStr Microbial functional diversity and carbon use feedback in soils as affected by heavy metals
title_full_unstemmed Microbial functional diversity and carbon use feedback in soils as affected by heavy metals
title_sort Microbial functional diversity and carbon use feedback in soils as affected by heavy metals
author_id_str_mv 3ddabbb54b2cfa2ea10f590ea7da6520
author_id_fullname_str_mv 3ddabbb54b2cfa2ea10f590ea7da6520_***_Wei Zhang
author Wei Zhang
author2 Yilu Xu
Balaji Seshadri
Nanthi Bolan
Binoy Sarkar
Yong Sik Ok
Wei Zhang
Cornelia Rumpel
Donald Sparks
Mark Farrell
Tony Hall
Zhaomin Dong
format Journal article
container_title Environment International
container_volume 125
container_start_page 478
publishDate 2019
institution Swansea University
issn 0160-4120
doi_str_mv 10.1016/j.envint.2019.01.071
document_store_str 1
active_str 0
description Soil microorganisms are an important indicator of soil fertility and health. However, our state of knowledge about soil microbial activities, community compositions and carbon use patterns under metal contaminations is still poor. This study aimed to evaluate the influences of heavy metals (Cd and Pb) on soil microorganisms by investigating the microbial community composition and carbon use preferences. Metal pollution was approached both singly and jointly with low (25 and 2500 mg kg−1) and high (50 and 5000 mg kg−1) concentrations of Cd and Pb, respectively, in an artificially contaminated soil. In a laboratory incubation experiment, bio-available and potentially bio-available metal concentrations, selected soil properties (pH, electrical conductivity, total organic carbon and total nitrogen), and microbial parameters (microbial activity as basal respiration, microbial biomass carbon (MBC) and microbial functional groups) were determined at two sampling occasions (7 and 49 days). Metal contamination had no effect on the selected soil properties, while it significantly inhibited both microbial activity and MBC formation. Contaminated soils had higher microbial quotient (qCO2), suggesting there was higher energy demand with less microbially immobilized carbon as MBC. Notably, the efficiency of microbial carbon use was repressed as the metal concentration increased, yet no difference was observed between metal types (p &#62; 0.05). Based on the microbial phospholipid fatty acids (PLFA) analysis, total PLFAs decreased significantly under metal stress at the end of incubation. Heavy metals had a greater negative influence on the fungal population than bacteria with respective 5–35 and 8–32% fall in abundances. The contaminant-driven (metal concentrations and types) variation of soil PLFA biomarkers demonstrated that the heavy metals led to the alteration of soil microbial community compositions and their activities, which consequently had an adverse impact on soil microbial carbon immobilization.
published_date 2019-04-30T03:59:35Z
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score 11.013148

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