【摘要】 为揭示不同温度和时间炭化的生物炭理化性质差异,以茶树枝为原材料,研究炭化温度(300、450和600℃)和时间(1和3 h)对茶树枝生物炭特性及元素组成的影响。结果表明,茶树枝生物炭呈多孔、高比表面积结构,较为完整地保留了茶树枝的组织结构。茶树枝生物炭产率随炭化温度的升高和时间的延长而降低,灰分含量、p H值、有机碳、全磷、全钾、全钙、全镁含量和C/N比升高,而全氮含量则呈降低趋势。生物炭p H值与灰分含量呈极显著正相关(P<0.01),灰分含量是茶树枝生物炭碱性的主要贡献因素。炭化条件对茶树枝生物炭理化性质具有明显影响,炭化温度的影响作用大于炭化时间。此外,探讨了茶树枝生物炭在茶园的应用前景,为茶树枝生物炭的应用提供了参考。更多还原

【Abstract】 To replore effects of temperature and duration of pyrolysis on physico-chemical properties of biochar,tea branches and twigs were used as raw material in pyrolysis under different temperatures( 300,450,600 ℃) for 1 and 3 hours,separately,and the biochars were analyzed for properties and element composition. Results show that the biochars were highly porous in structure with a high specific surface area and fairly well maintained organization structure of tea branches and twigs. With rising temperature and extending duration of pyrolysis,the biochar increased in ash content,p H,organic carbon,total phosphorus,total potassium,total calcium,total magnesium and C / N ratio,but decreased in total nitrogen.Meanwhile,ash content was extremely significantly and positively related with p H and was the main contributor to alkalinity of biochar. In addition,the conditions of pyrolysis had significant effects on physico-chemical properties of the tea-twigderived biochar,and the effect of temperature was higher than that of duration. Moreover,the paper also discussed prospects of the application of the tea-twig-derived biochar in tea gardens,and the findings of the study may serve as reference for application of the biochar.更多还原