沙蒿生物质炭在沙土中的降解特征

发布时间：2018-07-11 11:23

  本文选题：沙蒿 + 生物质炭　； 参考：《土壤》2017年05期

【摘要】：为明确不同炭化条件下沙蒿生物质炭的有机组分、炭化过程和降解特性。于不同炭化条件下无氧炭化制备沙蒿生物质炭并进行沙地封存。结果表明:H、O和N元素的质量分数及H/C、O/C和(N+O)/C均随炭化温度的升高和炭化时间的延长呈先降低后稳定的变化趋势,升温速率对其无显著影响。而C则呈相反趋势且均在炭化温度600℃、炭化时间60 min以后基本达定值,上述指标(H、O、N、H/C、O/C、(N+O)/C和C)的稳定值分别约为29.3 g/kg、79.8 g/kg、11.2 g/kg、0.40、0.07、0.08和879.7 g/kg。生物质炭的降解速率随着炭化温度的升高、炭化时间的延长和施用量的增大而降低,其半衰期为2~12年。综上,沙蒿的炭化既是有机组分富碳、去极性官能团的过程,同时也是芳香性增强、亲水性和极性减弱的过程,施用量和炭化温度是影响生物质炭降解的决定性因素。
[Abstract]:In order to determine the organic components, carbonization process and degradation characteristics of Artemisia annua biomass carbon under different carbonization conditions. Artemisia annua biomass charcoal was prepared by anaerobic carbonization under different carbonization conditions. The results show that the mass fraction of H / H _ 2O and N, H / C / C and (N _ O) / C are decreased first and then stable with the increase of carbonization temperature and the prolongation of carbonization time, but the heating rate has no significant effect on them. However, C showed a reverse trend and reached a stable value after carbonization temperature 600 鈩，

本文编号：2115011