Changes in enzyme activities and microbial biomass after “in situ” remediation of a heavy metal-contaminated soil

Mora, Alfredo Pérez de; Ortega‐Calvo, José‐Julio; Cabrera, Francisco; Madejón, Engracia

doi:10.1016/j.apsoil.2004.07.006

Cited by 235 publications

(54 citation statements)

References 47 publications

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“…Soil pollutants can affect key microbial processes and can decrease the numbers and activities of soil microorganisms so that changes microbial populations or activity can precede detectable changes in the physical and chemical properties of the soil (de Mora et al 2005;Garau et al 2007). From Table 4 the trends in Shannon H', Richness D and McIntosh U were similar to that of AWCD and the numbers of bacteria and fungi which were significantly higher in the intercropped pots.…”

Section: Soil Microbial Indicessupporting

confidence: 59%

Efficiency of Repeated Phytoextraction of Cadmium and Zinc from an Agricultural Soil Contaminated with Sewage Sludge

Luo

Liu

et al. 2015

International Journal of Phytoremediation

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Long-term application of sewage sludge resulted in soil cadmium (Cd) and zinc (Zn) contamination in a pot experiment conducted to phytoextract Cd/Zn repeatedly using Sedum plumbizincicola and Apium graceolens in monoculture or intercropping mode eight times. Shoot yields and soil physicochemical properties changed markedly with increasing number of remediation crops when the two plant species were intercropped compared with the unplanted control soil and the two monoculture treatments. Changes in soil microbial indices such as average well colour development, soil enzyme activity and soil microbial counts were also significantly affected by the growth of the remediation plants, especially intercropping with S. plumbizincicola and A. graveolens. The higher yields and amounts of Cd taken up indicated that intercropping of the hyperaccumulator and the vegetable species may be suitable for simultaneous agricultural production and soil remediation, with larger crop yields and higher phytoremediation efficiencies than under monoculture conditions.

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Section: Soil Microbial Indicessupporting

confidence: 59%

Efficiency of Repeated Phytoextraction of Cadmium and Zinc from an Agricultural Soil Contaminated with Sewage Sludge

Luo

Liu

et al. 2015

International Journal of Phytoremediation

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“…Remediation could improve or inhibit soil enzyme activities by alleviating heavy metal stress or causing new environmental stress (Kelly and Tate Iii 1998;Mora et al 2005;Udovic and Lestan 2012). In the present study, amendments had positive effects on dehydrogenase, urease, and catalase activities but negative effects Fig.…”

Section: Discussionmentioning

confidence: 69%

“…Our study revealed that amylase activity was inhibited, while sucrase activity was slightly stimulated. High heavy metal concentration could inhibit the amylase activity by destroying cells and restraining catabolic or anabolic reaction, while soil microbes could produce more invertin enzyme because microbes would require more C for maintenance (Mora et al 2005). Catalase, as an important indicator of soil oxidation-reduction potential, can catalyze the decomposition of hydrogen peroxide to water and oxygen (Chelikani et al 2004).…”

Section: Discussionmentioning

confidence: 99%

Determining soil enzyme activities for the assessment of fungi and citric acid-assisted phytoextraction under cadmium and lead contamination

Mao

Tang

Feng

et al. 2015

Environ Sci Pollut Res

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Microorganism or chelate-assisted phytoextraction is an effective remediation tool for heavy metal polluted soil, but investigations into its impact on soil microbial activity are rarely reported. Consequently, cadmium (Cd)-and lead (Pb)-resistant fungi and citric acid (CA) were introduced to enhance phytoextraction by Solanum nigrum L. under varied Cd and Pb pollution levels in a greenhouse pot experiment. We then determined accumulation of Cd and Pb in S. nigrum and the soil enzyme activities of dehydrogenase, phosphatase, urease, catalase, sucrase, and amylase. Detrended canonical correspondence analysis (DCCA) was applied to assess the interactions between remediation strategies and soil enzyme activities. Results indicated that the addition of fungi, CA, or their combination enhanced the root biomass of S. nigrum, especially at the high-pollution level. The combined treatment of CA and fungi enhanced accumulation of Cd about 22-47 % and of Pb about 13-105 % in S. nigrum compared with the phytoextraction alone. However, S. nigrum was not shown to be a hyperaccumulator for Pb. Most enzyme activities were enhanced after remediation. The DCCA ordination graph showed increasing enzyme activity improvement by remediation in the order of phosphatase, amylase, catalase, dehydrogenase, and urease. Responses of soil enzyme activities were similar for both the addition of fungi and that of CA. In summary, results suggest that fungi and CA-assisted phytoextraction is a promising approach to restoring heavy metal polluted soil.

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“…Soils retain HM by sorption, precipitation, and complexation; such reactions reduce the metal mobility and bioavailability [2,12,13]. However, this natural attenuation process can be complemented by in situ application of chemical technologies, as organic and inorganic amendments [14].…”

Section: Introductionmentioning

confidence: 99%

Comparative Use of Soil Organic and Inorganic Amendments in Heavy Metals Stabilization

Branzini

Zubillaga

2012

Applied and Environmental Soil Science

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Remediation strategies are capable to mitigate negative effects of heavy metals (HMs) on soils. The distribution of cooper (Cu), zinc (Zn), and chromium (Cr) was evaluated in a contaminated soil after adding biosolid compost (BC) and phosphate fertilizer (PF). A greenhouse assay and sequential extraction procedure were performed to determine the fractionation of HM in contaminated and remediated soil. In BC treatment, among 4 to 6% of Cu was associated with soil humic substances. Without amendments and with fertilizer application, Zn solubility increased by 15.4 and 8.4%, respectively, with experiment time. Although Cr was significantly adsorbed to the inorganic fraction, with compost application there was a transfer to organic fraction. A single amendment application is not suitable for immobilizing all metals of concern, because there are diverse union's behaviors between HM and soil matrix. As the organic matter and phosphate fertilizer were effective in reducing mobility of Cu, the organic matter was more effective in the immobilization of Cr, and inorganic amendment induced the Zn precipitation, results from this pilot study suggest a combined use of these two amendments for soil remediation strategies. However, liming may be further needed to prevent soil acidification on longer time scales. Also, we propose the use of chemical and biological remediation strategies for potential improvement of effectiveness.

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Changes in enzyme activities and microbial biomass after “in situ” remediation of a heavy metal-contaminated soil

Cited by 235 publications

References 47 publications

Efficiency of Repeated Phytoextraction of Cadmium and Zinc from an Agricultural Soil Contaminated with Sewage Sludge

Efficiency of Repeated Phytoextraction of Cadmium and Zinc from an Agricultural Soil Contaminated with Sewage Sludge

Determining soil enzyme activities for the assessment of fungi and citric acid-assisted phytoextraction under cadmium and lead contamination

Comparative Use of Soil Organic and Inorganic Amendments in Heavy Metals Stabilization

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