Carbon Quality of Four-Year-Old Woodchips in a Denitrification Bed Treating Agricultural Drainage Water
Carbon Quality of Four-Year-Old Woodchips in a Denitrification Bed Treating Agricultural Drainage Water
复制标题
DOI：
10.13031/trans.12642
复制
发表时间：
2018-01-01
影响因子：
1.5
通讯作者：
Tschirner, U. W.
中科院分区：
文献类型：
--
作者：
Ghane, E.;Feyereisen, G. W.;Tschirner, U. W.
反硝化床是一种降低地下排水中硝酸盐浓度的系统。为了更好地了解年龄对木片性能的影响，有必要对旧木片的碳质进行调查。本研究的目的是表征陈化木屑的碳质和碳氮比，并检验反硝化床对重复实验的适用性。为了实现这些目标，我们沿着明尼苏达州威尔马市附近一个106.4米长的反硝化床长度挖掘了四年的木屑，并对它们的粒度、C/N比和碳质进行了分析。粒度分析表明，沿床层12.5m至106.4 m的范围内相似。C/N平均为58.43.17~153.4+/-9.57.四年生的木屑的平均木质纤维素指数(LCI，一种衡量碳质的指标)在0.47到0.57(入口处最高)之间。木屑颗粒大小、C/N比和25.9m~106.4 m范围内的LCI值基本一致。总之，随着时间的推移，四年生木屑的C/N比和LCI分别表现出分解和增加木屑碳顽固性的效应。
A denitrification bed is a system that can reduce the nitrate concentration in subsurface drainage water. There is a need to investigate the carbon quality of old woodchips to gain a better understanding of the effect of age on woodchip properties. The objectives of this study were to characterize the carbon quality and carbon to nitrogen (C/N) ratio of aged woodchips and to examine the suitability of a denitrification bed for a replicated experiment. To achieve these goals, we excavated four-year-old woodchips along the length of a 106.4 m long denitrification bed near Willmar, Minnesota, and analyzed them for particle size, C/N ratio, and carbon quality. Particle size analysis showed similarities from 12.5 to 106.4 m along the bed. We found a mean C/N ratio ranging from 58.4 +/- 3.17 to 153.4 +/- 9.57 (smallest at the inlet). The mean lignocellulose index (LCI, a measure of carbon quality) of the four-year-old woodchips ranged from 0.47 to 0.57 (highest at the inlet). The woodchip particle sizes, C/N ratios, and LCI from 25.9 to 106.4 m along the bed length were similar. In conclusion, the C/N ratio and LCI of the four-year-old woodchips showed effects of decomposition and increased woodchip carbon recalcitrance over time, respectively.