Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, China.
Department of Environmental Engineering, College of Science and Technology, Korea University, Sejong-ro 2511, Sejong 339-700, South Korea.
Bioresour Technol. 2015;188:92-8. doi: 10.1016/j.biortech.2015.01.013. Epub 2015 Jan 20.
Nitrogen transformations in aquaponics with different edible plant species, i.e., tomato (Lycopersicon esculentum) and pak choi (Brassica campestris L. subsp. chinensis) were systematically examined and compared. Results showed that nitrogen utilization efficiencies (NUE) of tomato- and pak choi-based aquaponic systems were 41.3% and 34.4%, respectively. The abundance of nitrifying bacteria in tomato-based aquaponics was 4.2-folds higher than that in pak choi-based aquaponics, primarily due to its higher root surface area. In addition, tomato-based aquaponics had better water quality than that of pak choi-based aquaponics. About 1.5-1.9% of nitrogen input were emitted to atmosphere as nitrous oxide (N2O) in tomato- and pak choi-based aquaponic systems, respectively, suggesting that aquaponics is a potential anthropogenic source of N2O emission. Overall, this is the first intensive study that examined the role plant species played in aquaponics, which could provide new strategy in designing and operating an aquaponic system.
不同食用植物物种（即番茄和白菜）在水培系统中的氮转化被系统地研究和比较。结果表明，基于番茄和白菜的水培系统的氮利用效率（NUE）分别为 41.3%和 34.4%。基于番茄的水培系统中硝化细菌的丰度比基于白菜的水培系统高 4.2 倍，主要是因为其根表面积更大。此外，基于番茄的水培系统的水质优于基于白菜的水培系统。在基于番茄和白菜的水培系统中，约有 1.5-1.9%的氮输入以氧化亚氮（N2O）的形式排放到大气中，这表明水培系统是 N2O 排放的人为潜在来源。总的来说，这是首次对植物物种在水培系统中的作用进行的深入研究，可为设计和运行水培系统提供新策略。
