Transformation mechanism of nutrient elements in the process of biochar preparation for returning biochar to soil

doi:10.1016/j.cjche.2016.09.009

摘要/Abstract

摘要： Returning biochar to soil is a heavily researched topic because biochar functions well for soil improvement.There is a significant loss of nutrients,which occurs during biochar preparation before biochar is returned to soil,thereby seriously undermining biochar's efficacy.Therefore,the transformation mechanisms of biochar pH,mass,nutrients and metals during pyrolysis under different atmospheres and temperatures were studied such that the best method for biochar preparation could be developed.Several conclusions can be reached:(1) a CO₂ atmosphere is better than a N₂ atmosphere for biochar preparation,although preparation in a CO₂ atmosphere is not a common practice for biochar producers;(2)350℃ is the best temperature for biochar preparation because the amount of nutrient loss is notably low based on the premise of straw transferred into biochar;and (3) transforming mechanisms of pH,N,P and K are also involved in the biochar preparation process.

关键词: Agricultural waste, Rice straw, Biochar, Nutrient transformation, pH transformation

Abstract: Returning biochar to soil is a heavily researched topic because biochar functions well for soil improvement.There is a significant loss of nutrients,which occurs during biochar preparation before biochar is returned to soil,thereby seriously undermining biochar's efficacy.Therefore,the transformation mechanisms of biochar pH,mass,nutrients and metals during pyrolysis under different atmospheres and temperatures were studied such that the best method for biochar preparation could be developed.Several conclusions can be reached:(1) a CO₂ atmosphere is better than a N₂ atmosphere for biochar preparation,although preparation in a CO₂ atmosphere is not a common practice for biochar producers;(2)350℃ is the best temperature for biochar preparation because the amount of nutrient loss is notably low based on the premise of straw transferred into biochar;and (3) transforming mechanisms of pH,N,P and K are also involved in the biochar preparation process.

Key words: Agricultural waste, Rice straw, Biochar, Nutrient transformation, pH transformation

Shuangshuang Tian, Zhongxin Tan, Alfreda Kasiuliene., Ping Ai. Transformation mechanism of nutrient elements in the process of biochar preparation for returning biochar to soil[J]. , 2017, 25(4): 477-486.

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