The straw biochar obtained by slow pyrolysis,as one of most common biochars,was used as a research object,while the biochar application to soil was used as an application scenario.The carbon sequestration potential and environmental impacts by the application of biochar technology were discussed and analyzed in detail using the methodology of life cycle assessment(LCA).The results showed that the preparation and application of 1t straw biochar(the straw biochar system)was able to reduce carbon dioxide equivalent(CO2e)emissions by 5.50×103kg and achieve carbon sequestration of 5.53×103kg CO2e,which had a significant effect on greenhouse gas emission reduction.As for the environmental-hazard potential,the preparation and application of the straw biochar system effectively mitigated abiotic depletion potential(-5.15×10-5kgSbe)and eutrophication potential(-5.35×10-3kgPO43 e),which had a small negative impact on acidification potential(0.0576kgSO2e),ozone depletion potential(8.28 ×10-14kgR11e),photochemical oxidation potential(7.38kgC2H4e)and human toxicity potential(2.01kgDCBe).
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