Effects of heavy metal contamination on microbial biomass and community structure in soils

Yang, Yuangen; Liu, Cong‐Qiang; Xu, Lei; Wu, Pan; Zhang, Guoping

doi:10.1007/bf02871303

Cited by 13 publications

(9 citation statements)

References 36 publications

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“…The PCA showed a change in C substrate utilization patterns in high Cd concentration treatments ( Fig.7), suggesting that the active members of the microbial community under Cd stress were different from those in the control soil (without external Cd loading). However, no significant changes in microbial community structure occurred in heavy metal contaminated soils as reported by Yang et al(2004). The major reason they provided was the strong binding between heavy metal and soil components, which decreased the bioavailability and toxicity of the added heavy metals.…”

Section: Changes In Microbial Community Diversitymentioning

confidence: 89%

“…Heavy metal pollution can cause shifts in the composition of microbial community (Li et al, 2006). DNA, phospholipids fatty acid (PLFA), and Biolog analyses are three commonly used analytical procedures for the evaluation of soil biological characteristics, and most of previous studies either used only one of the procedures to study the effects of Cd on microbial community structure (Muhammad et al, 2005;Renella and Mench, 2004), or focused on multiple heavy metal pollution (Yang et al, 2004). The difference in soil microbiological characteristics measured with only one method may not be reliable since the use of the other methods often leads to different interpretation of relative soil similarities (Widmer et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

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Microbial activity and community diversity in a variable charge soil as affected by cadmium exposure levels and time

Shentu

2008

J. Zhejiang Univ. Sci. B

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Effects of cadmium (Cd) on microbial biomass, activity and community diversity were assessed in a representative variable charge soil (Typic Aquult) using an incubation study. Cadmium was added as Cd(NO3)(2) to reach a concentration range of 0-16 mg Cd/kg soil. Soil extractable Cd generally increased with Cd loading rate, but decreased with incubation time. Soil microbial biomass was enhanced at low Cd levels (0.5-1 mg/kg), but was inhibited consistently with increasing Cd rate. The ratio of microbial biomass C/N varied with Cd treatment levels, decreasing at low Cd rate (<0.7 mg/kg available Cd), but increasing progressively with Cd loading. Soil respiration was restrained at low Cd loading (<1 mg/kg), and enhanced at higher Cd levels. Soil microbial metabolic quotient (MMQ) was generally greater at high Cd loading (1-16 mg/kg). However, the MMQ is also affected by other factors. Cd contamination reduces species diversity of soil microbial communities and their ability to metabolize different C substrates. Soils with higher levels of Cd contamination showed decreases in indicator phospholipids fatty acids (PLFAs) for Gram-negative bacteria and actinomycetes, while the indicator PLFAs for Gram-positive bacteria and fungi increased with increasing levels of Cd contamination.

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Section: Changes In Microbial Community Diversitymentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Microbial activity and community diversity in a variable charge soil as affected by cadmium exposure levels and time

Shentu

2008

J. Zhejiang Univ. Sci. B

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“…Recently, an increasing awareness has emerged concerning the importance of microbial diversity in terrestrial ecosystems, and soil microbial community structure has also been considered as a biological indicator of heavy metal stress (Doelman et al, 1994;Pennanen et al, 1996;Liao Min et al, 2005). The microbial community structure is considered as one of the important parameters for soil ecosystem community structure and stability (Cai Xinde et al, 2006;Yang Yuangen et al, 2001;Yang Yuangen et al, 2004). Microbial community measurements based on phospholipid fatty acid (PLFA) composition allowed the detection of shifts in microbial composition in different soil types after short-and long-term heavy metal exposures (Frostegård et al, 1993).…”

Section: Introductionmentioning

confidence: 99%

Effects of contamination of single and combined cadmium and mercury on the soil microbial community structural diversity and functional diversity

Xie

Liao

et al. 2011

Chin. J. Geochem.

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To assess the effects of single and combined pollution of cadmium (Cd) and mercury (Hg) on soil microbial community structural and functional diversities, an incubation experiment was conducted, by employing two soils, namely, the marine sediment silty loam soil and the yellowish-red soil, in which five levels of Cd, Hg and Cd and Hg in combination were added. After being incubated for 56 days, the phospholipid fatty acids (PLFAs) profile and sole carbon source utilization pattern (BIOLOG) of the samples were tested. The results showed that the composition of the microbial communities changed significantly at different levels of metals application. The principal component analyses (PCA) of PLFAs indicated that the structure of the microbial community was also significantly altered with increasing levels of metals, with increasing PLFAs biomarkers for fungi and actinomycetes, and increasing ratio of Gram-positive to Gram-negative bacteria. Sole carbon source utilization pattern analysis revealed that single and combined application of Cd and Hg inhibited significantly the functional activity of soil microorganisms, the functional diversity indices [Richness (S), Shannon-Wiener indices (H) and Evenness (E H )] were significantly lower in polluted soils than those in non-polluted soils, which also significantly altered with increasing levels of metals. PCA for the sole carbon source utilization pattern also indicated that the metal contamination could result in a variable soil microbial community. The results revealed that the combination of Cd and Hg had higher toxicity to soil microbial community structural and functional diversities than the individual application of Cd or Hg.

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“…Available Pb in soil is related mainly to the soluble, exchangeable, carbonate-bound fractions, partly to the Fe-Mn oxide-bound fraction and organic-bound fraction, slightly to the residue form. Yang Yuangen et al (2004) reported that Pb was concentrated largely in the surface layer of soil, and the Pb concentrations tend to decrease with increasing depth. And Pb was present predominantly in the residue and Fe-Mn oxide-bound forms.…”

Section: Available Pb Concentrations Extracted By Different Extractanmentioning

confidence: 99%

Selection of better extractants to indicate Pb bioavailability in lead-contaminated agricultural soils of Zhejiang Province

Zeng

Liao

Chen

et al. 2007

Chin. J. of Geochem.

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The accumulation of Pb in the food chain is one of the great concerns as it can cause chronic health problems and the available Pb is easily absorbed by crops. To shed light on Pb bioavailability in lead-contaminated agricultural soils of Zhejiang Province, a series of plant growth experiments were performed in a greenhouse to select more suitable extractants from five commonly used extractants (0.1 M HCl, 1 M NH 4 OAc, 0.1 M CaCl 2 , DTPA-TEA and Mehlich 3). The results showed that 1 M NH 4 OAc can extract Pb best, indicating the Pb bioavailability, then, DTPA-TEA and 0.1 M HCl in the tested soils. In case 1 M NH 4 OAc was used as an extractant, the critical Pb concentrations in soils were 50.19 mg/kg, 21.16 mg/kg and 114.00 mg/kg (1 M NH 4 OAc extracted Pb) in silty loam, yellowish-red soil and purplish soil, respectively. When the values exceed the above ones, the contents of Pb in Chinese cabbage leaves will exceed the Chinese Tolerance Limit of Lead in Foods (GB14935-94), as a result, potential ecological risk and hazard to human health via the food chain will appear.

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Effects of heavy metal contamination on microbial biomass and community structure in soils

Cited by 13 publications

References 36 publications

Microbial activity and community diversity in a variable charge soil as affected by cadmium exposure levels and time

Microbial activity and community diversity in a variable charge soil as affected by cadmium exposure levels and time

Effects of contamination of single and combined cadmium and mercury on the soil microbial community structural diversity and functional diversity

Selection of better extractants to indicate Pb bioavailability in lead-contaminated agricultural soils of Zhejiang Province

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