Xu De-Fu, Pan Qian-Cheng, Li Ying-Xue, Chen Xiao-Yi, Wang Jia-Jun, Zhou Lei
Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing 210044, China.
School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China.
Huan Jing Ke Xue. 2018 Jul 8;39(7):3187-3193. doi: 10.13227/j.hjkx.201712072.
A constructed wetland with L. was built. Straw biochar, reed biochar, and sawdust biochar was added into the constructed wetland individually to study the effect of different biochars on the root morphology, dissolved oxygen, and purification ability of the constructed wetland. The results show that the total root length, total projection area, total volume, total surface area, root number, branch number, and root dry weight of L. significantly increased when all three kinds of biochar were added into the constructed wetland (<0.05). Similarly, adding the biochars into the constructed wetland also significantly increased dissolved oxygen content in the wetland (<0.05). Addition of sawdust biochar into the constructed wetland increased the root length, projection area, surface area, total volume, number of root tips, number of branches, and root dry weight of L. by 96.1%, 106.2%, 185.6%, 172.5%, 75.3%, 121.6%, and 84.9%, respectively. After adding biochars into the constructed wetland, the root morphology of L. and dissolved oxygen content was significantly correlated with removal rate of TN, TP, and COD, respectively. Addition of sawdust biochar into the constructed wetland significantly increased the removal rates of total nitrogen, total phosphorus, and COD when the hydraulic load was 0.022 m·(m·d) (<0.05). These results suggested that the addition of sawdust biochar to the constructed wetland increased the root growth of L. and enhanced dissolved oxygen content, resulting in purification capacity of the constructed wetland.
构建了一个种植黑麦草的人工湿地。将秸秆生物炭、芦苇生物炭和木屑生物炭分别添加到人工湿地中，以研究不同生物炭对人工湿地根系形态、溶解氧和净化能力的影响。结果表明，当三种生物炭都添加到人工湿地中时，黑麦草的总根长、总投影面积、总体积、总表面积、根数、分支数和根干重均显著增加（P<0.05）。同样，向人工湿地中添加生物炭也显著提高了湿地中的溶解氧含量（P<0.05）。向人工湿地中添加木屑生物炭使黑麦草的根长、投影面积、表面积、总体积、根尖数、分支数和根干重分别增加了96.1%、106.2%、185.6%、172.5%、75.3%、121.6%和84.9%。向人工湿地中添加生物炭后，黑麦草的根系形态和溶解氧含量分别与总氮、总磷和化学需氧量的去除率显著相关。当水力负荷为0.022 m·(m²·d)时，向人工湿地中添加木屑生物炭显著提高了总氮、总磷和化学需氧量的去除率（P<0.05）。这些结果表明，向人工湿地中添加木屑生物炭增加了黑麦草的根系生长并提高了溶解氧含量，从而增强了人工湿地的净化能力。
