The Effects of Kitchen Waste Biochar on Soil Cadmium and Arsenic Immobilization and Soil Organic Carbon Storage
[Objective]The purpose of this study was to determine the effects of kitchen waste biochar on heavy metals remediation and soil carbon storage in the contaminated cropland soil.[Method]To achieve this,a soil incubation experiment was conducted by adding 300,500 and 600℃kitchen waste biochar to cadmium(Cd)and arsenic(As)co-contaminated soil.We determined the effects of kitchen waste biochar on soil and enzyme activities,soil organic carbon content,and the availabilities of Cd and As.[Result]As compared to the control(CK),the addition of 300℃biochar(B3)and 600℃biochar(B6)significantly reduced the available Cd by 7.7%and 15.4%,respectively,while had no significant impact on As availability.As compared to CK,B3 treatment significantly increased soil alkaline nitro-gen,organic matter content,catalase and phosphatase activities by 33.7%,283.6%,18.2%and 33.1%,respectively.However,B6 treatment significantly reduced soil urease activity.The application of different biochar treatments resulted in a decrease in sugarcane enzyme activity.Furthermore,as compared to CK,the total organic carbon,B3 treatment significantly increased easily oxidizable organic carbon and particulate organic carbon contents by 283.2%,227.1%and 117.4%,respectively.The soil carbon pool stability index decreased due to the increase of unstable carbon under the treatment of B3.[Conclusion]Adding kitchen waste biochar to cropland soil has a number of positive effects,including a decrease in the avail-ability of Cd,an increase in soil carbon storage,an improvement in soil fertility,an enhanced soil car-bon sink,and waste management for kitchen waste.
kitchen wastebiocharcompound polluted soil in farmlandcarbon sink enhancement
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