Soil organic carbon buffers heavy metal contamination on semiarid soils: Effects of different metal threshold levels on soil microbial activity

2009 ◽  
Vol 45 (3) ◽  
pp. 220-228 ◽  
Author(s):  
J.L. Moreno ◽  
F. Bastida ◽  
M. Ros ◽  
T. Hernández ◽  
C. García
Keyword(s):  
Heavy Metal ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Microbial Activity ◽  
Metal Contamination ◽  
Heavy Metal Contamination ◽  
Soil Microbial Activity ◽  
Threshold Levels ◽  
Soil Microbial ◽  
Semiarid Soils

Effects of treated wastewater irrigation on the dissolved and soil organic carbon in Israeli soils

2008 ◽  
Vol 57 (5) ◽  
pp. 727-733 ◽  
Author(s):  
E. Jueschke ◽  
B. Marschner ◽  
J. Tarchitzky ◽  
Y. Chen
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Microbial Activity ◽  
Water Source ◽  
Soil Microbial Activity ◽  
Biological Properties ◽  
Treated Wastewater ◽  
Worst Case ◽  
Soil Microbial ◽  
Irrigation Period

In many arid and semi-arid regions, the demand for drinking water and other domestic uses is constantly growing due to demographic growth and increasing standard of living. Therefore, less freshwater is available for agricultural irrigation and new water sources are needed. Treated wastewater (TWW) already serves as an important water source in Israel since more than 40 years and its usage will further be extended. Related to its high loads with nutrients, salts and organic materials its use as irrigation water can have major effects on the soil physical, chemical and biological properties, in the worst case leading to soil degradation. Additional organic matter reaches the soil with the effluent water and soil microbial activity is stimulated. Soil organic carbon (SOC) seems to accumulate in the topsoil and tends to decrease after long-term irrigation with secondary TWW in the subsoil. The amount of dissolved organic carbon increased and the aromaticity of the organic compounds in the soil percolates decreased over the irrigation period. Priming effects, occurring after stimulation of microbial activity by the addition of easily degradable substances, could be found in the soils and were stronger for subsoil (1 m depth).

Effect of heavy metal contamination on the rate of decomposition of sewage sludge and microbial activity

1996 ◽  
Vol 11 (1-2) ◽  
pp. 331-333 ◽  
Author(s):  
E. Filcheva ◽  
M.V. Cheshire ◽  
C.D. Campbell ◽  
D.B. McPhail
Keyword(s):  
Heavy Metal ◽  
Sewage Sludge ◽  
Microbial Activity ◽  
Metal Contamination ◽  
Heavy Metal Contamination

scholarly journals How the Soil Microbial Communities and Activities Respond to Long-Term Heavy Metal Contamination in Electroplating Contaminated Site

2021 ◽  
Vol 9 (2) ◽  
pp. 362 ◽  
Author(s):  
Wen-Jing Gong ◽  
Zi-Fan Niu ◽  
Xing-Run Wang ◽  
He-Ping Zhao
Keyword(s):  
Heavy Metal ◽  
Microbial Communities ◽  
Metal Contamination ◽  
Heavy Metal Contamination ◽  
Soil Microbial Communities ◽  
Contaminated Site ◽  
Rrna Gene ◽  
Soil Microbial ◽  
Cu And Zn

The effects of long-term heavy metal contamination on the soil biological processes and soil microbial communities were investigated in a typical electroplating site in Zhangjiakou, China. It was found that the soil of the electroplating plant at Zhangjiakou were heavily polluted by Cr, Cr (VI), Ni, Cu, and Zn, with concentrations ranged from 112.8 to 9727.2, 0 to 1083.3, 15.6 to 58.4, 10.8 to 510.0 and 69.6 to 631.6 mg/kg, respectively. Soil urease and phosphatase activities were significantly inhibited by the heavy metal contamination, while the microbial biomass carbon content and the bacterial community richness were much lower compared to noncontaminated samples, suggesting that the long-term heavy metal contamination had a severe negative effect on soil microorganisms. Differently, soil dehydrogenase was promoted in the presence of Chromate compared to noncontaminated samples. This might be due to the enrichment of Sphingomonadaceae, which have been proven to be able to secrete dehydrogenase. The high-throughput sequencing of the 16S rRNA gene documented that Proteobacteria, Actinobacteria, and Chloroflexi were the dominant bacterial phyla in the contaminated soil. The Spearman correlation analysis showed the Methylobacillus, Muribaculaceae, and Sphingomonadaceae were able to tolerate high concentrations of Cr, Cr (VI), Cu, and Zn, indicating their potential in soil remediation.

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