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      2. 保溫時間對不同秸稈生物炭肥料化利用理化特性的影響
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        公益性行業(農業)科研專項(201503135); 武漢東湖學院青年基金項目(2019dhzk001)


        Effects of holding time on physical and chemical properties of utilizing different straw biochar fertilizer
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          摘要:

          試驗以水稻、小麥、玉米、油菜和棉花秸稈為研究對象,考察不同保溫時間對5種秸稈生物炭的炭產率、組成成分、pH、電導率和孔隙結構的影響,并對不同生物炭理化特性的相關性進行分析。結果表明,保溫時間和原料種類對秸稈生物炭肥料化利用的理化特性均有顯著性影響(P<0.05)。秸稈生物炭產率為41%~61%、碳轉化率為53%~65%。保溫時間從0 min增加到120 min,炭產率減少而生物炭的固定碳含量增加,pH和電導率增加,孔壁變薄孔徑增大。保溫時間與秸稈生物炭的炭產率、H、O和揮發分含量呈顯著的線性負相關,與固定碳含量呈顯著線性正相關。保溫時間為60~90 min時,秸稈生物炭的H/C<1,芳香化程度較高,性質穩定。生物炭表面光滑,內部具有較大的空腔,且生物炭的pH、電導率較高,揮發分含量低,是一種較好的炭基肥添加劑材料。

          Abstract:

          The effects of different holding times on the biochar yield,composition,pH,electrical conductivity and pore structure of five kinds of straws including rice,wheat,corn,rape and cotton were investigated.Correlation between the physical and chemical properties of different biochars was analyzed.The results showed that effects of straw type and holding time on the physicochemical properties of biochar fertilizer were significant (P<0.05).The biochar yields and the carbon conversion efficiency of straws ranged from 41% to 61%,and 53% to 65%,respectively.With the increase of holding time,the biochar yields decreased,while the pyrolysis degree and the fixed carbon contents of biochars increased.The pH and electrical conductivity increased with the increase of holding time.The holding time was negatively correlated with carbon yield,H,O contents and volatile matter content of biochars,and positively correlated with fixed carbon content.The optimal holding time is 60-90 min,and the biochars obtained under this condition has a rich pore structure with smooth surface.The biochars with lower H/C and higher pH and electrical conductivity can be used as a good carbon-based fertilizer additive material.

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        劉朝霞,劉鳴,牛文娟,陳艷,牛智有.保溫時間對不同秸稈生物炭肥料化利用理化特性的影響[J].華中農業大學學報,2020,39(4):182-192

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        • 收稿日期:2019-08-26
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        • 在線發布日期: 2020-07-30
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