State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, 150090, PR China.
State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, 150090, PR China.
Bioresour Technol. 2017 Apr;229:196-203. doi: 10.1016/j.biortech.2017.01.023. Epub 2017 Jan 13.
This study focused on the effects of plant compositions on removal rates of pollutants in microcosms through investigating rhizosphere microbial populations, photosynthetic efficiency and growth characteristics. Mixed-culture groups improved the removal efficiency of TN and TP significantly but exhibited lower COD removal rates. Total plant biomasses were improved as the species richness increased, but the N/P content in the plants was mainly affected by the type of species. The mixed-culture groups showed lower photosynthesis rates and oxygen supply generated from roots under high irradiation. Microbial communities of the cultured groups in the rhizosphere exhibited significant differences. According to principal component analysis (PCA), the fungi were the typical microbes of SPA, SPAB, and SPABC, resulted in improvement in nutrient accumulation. These results demonstrated that a mixed culture strategy can represent the overyielding of biomass, promote the photo-protection mechanism, and will further increase the removal rates of pollutants in a constructed wetland.
本研究通过调查根际微生物种群、光合作用效率和生长特性，着重研究了植物组成对小区域中污染物去除率的影响。混合培养组显著提高了 TN 和 TP 的去除效率，但 COD 去除率较低。随着物种丰富度的增加，总植物生物量得到了提高，但植物中的 N/P 含量主要受物种类型的影响。混合培养组在高辐射下表现出较低的光合作用速率和根系产生的氧气供应。培养组根际微生物群落表现出显著差异。根据主成分分析（PCA），真菌是 SPA、SPAB 和 SPABC 的典型微生物，促进了营养物质的积累。这些结果表明，混合培养策略可以代表生物量的过度生长，促进光保护机制，并将进一步提高人工湿地中污染物的去除率。
