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

作　　者：Hamna SALEEM Mahtab AHMAD Jamshaid RASHID Munir AHMAD Mohammad I.AL-WABEL Memuna AMIN 

机构地区：[1]Department of Environmental Sciences,Faculty of Biological Sciences,Quaid-i-Azam University,Islamabad 45320,Pakistan [2]Soil Sciences Department,College of Food&Agricultural Sciences,King Saud University,P.O.Box 2460,Riyadh 11451,Saudi Arabia

出　　处：《Pedosphere》2022年第2期283-293,共11页土壤圈（英文版）

基　　金：partially supported by the University Research Fund Program of the Quaid-i-Azam University, Pakistan。

摘　　要：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 application.Therefore,more studies are needed to elucidate the mechanisms through which biochar affects saline soil properties.In 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 conducted.The 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 CK.Besides 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 fraction.The recalcitrance index (R50) values of BC500 and BC700 were>0.8,indicating their high stability in the saline soil.It 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 

分 类 号：S156.4[农业科学—土壤学]