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Carbon potentials of different biochars derived from municipal solid waste in a saline soil

Pedosphere 2022年第2期32卷 283-293页

作者： Hamna SALEEM Mahtab AHMAD Jamshaid RASHID Munir AHMAD Mohammad I.AL-WABEL memuna amin Department of Environmental Sciences Faculty of Biological SciencesQuaid-i-Azam UniversityIslamabad 45320Pakistan Soil Sciences Department College of Food&Agricultural SciencesKing Saud UniversityP.O.Box 2460Riyadh 11451Saudi Arabia

There are numerous studies conducted on biochar for its carbon (C) sequestration potential;however,there are limited studies available on the behavior of salt-affected soils related to biochar ***,more studies are needed to elucidate the mechanisms through which biochar affects saline soil *** this study,biochars were produced from solid waste at pyrolysis temperatures of 300,500,and 700?C (BC300,BC500,and BC700,respectively)and applied to a saline soil to evaluate their impacts on soil carbon dioxide (CO_(2)) efflux,C sequestration,and soil quality.A soil incubation experiment lasting for 107 d was *** results showed that soil CO_(2) efflux rate,cumulative CO_(2) emission,active organic C (AOC),and organic matter (OM)significantly increased with BC300 application to a greater extent than those with BC500 and BC700 as compared to those in the no-biochar control (CK).However,soil C non-lability did not significantly increase in the treatments with biochars,except BC700,as compared to that in *** improving the soil quality by increasing the soil AOC and OM,BC300 showed positive impacts in terms of increasing CO_(2) emission from the saline soil,while BC500 and BC700 showed greater potentials of sequestering C in the saline soil by increasing the soil non-labile C *** recalcitrance index (R50) values of BC500 and BC700 were>0.8,indicating their high stability in the saline *** could be concluded that biochars pyrolyzed at high temperatures (?500?C)could be suitable in terms of C sequestration,while biochars pyrolyzed at low temperatures (?300?C) could be suitable for improving saline soil quality.

关键词： carbon sequestration carbon storage climate change CO_(2)efflux CO_(2)emission pyrolysis temperature recalcitrance index soil quality

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