文章摘要
林婉嫔, 夏建国, 肖欣娟, 李祥羽, 王湘贻.不同热解温度茶渣生物质炭对茶园土壤吸附解吸NH4-N的影响[J].水土保持学报,2019,33(6):326~331
不同热解温度茶渣生物质炭对茶园土壤吸附解吸NH4-N的影响
Effect of NH4+-N Adsorption-desorption by Tea Residue Biochar Prepared at Different Pyrolysis Temperatures in Tea Plantation Soil
投稿时间:2019-06-12  
DOI:10.13870/j.cnki.stbcxb.2019.06.046
中文关键词: 茶渣生物质炭  铵态氮  吸附解吸  解吸滞后
英文关键词: tea residue biochar  ammonium nitrogen  adsorption-desorption  desorption hysteresis
基金项目:四川省学术和技术带头人培养基金项目(2014);四川农业大学学科建设双支计划项目(2019)
作者单位E-mail
林婉嫔, 夏建国, 肖欣娟, 李祥羽, 王湘贻 四川农业大学资源学院, 成都 611130 xiajianguo@126.com 
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中文摘要:
      生物质炭对铵根的吸附解吸影响着土壤的固氮效果,为探讨茶渣生物质炭对茶园土吸附-解吸NH4+-N性能的影响,减少土壤中氮素的淋失,提高氮素利用效率,通过模拟培养试验,采用平衡吸附法及HCL解吸法,研究了不同热解温度下制备的茶渣生物质炭在不同添加比例(0.35%,0.70%,1.40%,2.80%)下,茶园土对NH4+-N吸附解吸的特性。结果表明:施用生物质炭能有效增强茶园土对NH4+-N的吸附,并随生物质炭添加量的增加而增强。同一生物质炭添加量下,4种生物质炭处理下茶园土对NH4+-N的吸附量大小表现为BC400 > BC300 > BC500 > BC600。生物质炭的CEC含量是影响土壤吸附NH4+-N能力的主要因素。土壤对NH4+-N的吸附过程均以Langmuir方程拟合达到显著水平(0.953 7<R2<0.995 5),以单层吸附为主。施用生物质炭后,土壤产生了解吸滞后,有效降低了茶园土对NH4+-N的解吸率,BC400的解吸率最低。茶渣生物质炭能够增强土壤对NH4+-N的吸附,降低对NH4+-N的解吸,有利于提高土壤对氮素的吸持能力,其中BC400,2.80%处理下效果最佳。
英文摘要:
      The adsorption and desorption of ammonium by biochar affects the nitrogen fixation effect of soil. To explore the effect of tea residue biochar on the adsorption-desorption of NH4+-N in tea garden soil, reduce nitrogen leaching in soil, and improve nitrogen use efficiency, through a simulated culture experiment, the equilibrium adsorption method and HCL desorption method were used to study the adsorption-desorption of NH4+-N characteristics in tea garden soil in which the biochar that prepared at different pyrolysis temperatures was differently added (0.35%, 0.70%, 1.40%, 2.80%). The results showed that the application of biochar could effectively enhance the adsorption of NH4+-N by tea garden soil and the enhancement increase with the increase of biochar addition. Under the same addition, the adsorption amount of NH4+-N in the tea garden soil treated by four kinds of biochar trended as BC400 > BC300 > BC500 > BC600. The CEC content of biomass carbon was the main factor affecting the ability of soil to adsorb NH4+-N. The adsorption process of NH4+-N by soil, which was dominated by monolayer adsorption, reached a significant level by matching the Langmuir equation (0.953 7<R2<0.995 5). After the application of biomass charcoal, the soil produced a known absorption hysteresis, which effectively reduced the desorption rate of NH4+-N in tea garden soil, and the desorption rate of BC400 was the lowest. Tea residue biochar can enhance the adsorption of NH4+-N in soil, reduce the desorption of NH4+-N, improve the ability of soil to absorb nitrogen, and the treatment of BC400 with 2.80% addition showed the best effect.
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