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Biochar alleviates metal toxicity and improves microbial community functions in a soil co-contaminated with cadmium and lead

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Biochar 2021年第4期3卷 485-498页

作者： Nahid Azadi Fayez Raiesi Faculty of Agriculture Department of Soil Science and EngineeringShahrekord UniversityP.O.Box 115ShahrekordIran

Soil amendment with biochar alleviates the toxic effects of heavy metals on microbial functions in single-metal contaminated ***,it is unclear how biochar application would improve microbial activity and enzymatic activity in soils co-polluted with toxic *** present research aimed at determining the response of microbial and biochemical attributes to addition of sugarcane bagasse biochar(SCB)in cadmium(Cd)-lead(Pb)co-contaminated ***(400 and 600°C)decreased the available concentrations of Cd and Pb,increased organic carbon(OC)and dissolved organic carbon(DOC)contents in *** decrease of metal availability was greater with 600°C SCB than with 400°C SCB,and metal immobilization was greater for Cd(16%)than for Pb(12%)in co-spiked soils amended with low-temperature *** application improved microbial activity and biomass,and enzymatic activity in the soils co-spiked with metals,but these positive impacts of SCB were less pronounced in the co-spiked soils than in the single-spiked *** decreased the adverse impacts of heavy metals on soil properties largely through the enhanced labile C for microbial assimilation and partly through the immobili-zation of *** analysis further confirmed that soil OC was overwhelmingly the dominant driver of changes in the properties and quality of contaminated soils amended with *** promotion of soil microbial quality by the low-temperature SCB was greater than by high-temperature SCB,due to its higher labile C *** findings showed that SCB at lower temperatures could be applied to metal co-polluted soils to mitigate the combined effects of metal stresses on microbial and biochemical functions.

关键词： Bagasse biochar Microbial activity Soil enzymes metal co-contamination

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