School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing, 210044, China.
Environ Sci Pollut Res Int. 2013 Sep;20(9):5922-9. doi: 10.1007/s11356-013-1860-1. Epub 2013 Jun 2.
This study investigates biomass, density, photosynthetic activity, and accumulation of nitrogen (N) and phosphorus (P) in three wetland plants (Canna indica, Typha augustifolia, and Phragmites austrail) in response to the introduction of the earthworm Eisenia fetida into a constructed wetland. The removal efficiency of N and P in constructed wetlands were also investigated. Results showed that the photosynthetic rate (P n), transpiration rate (T r), and stomatal conductance (S cond) of C. indica and P. austrail were (p < 0.05) significantly higher when earthworms were present. The addition of E. fetida increased the N uptake value by above-ground of C. indica, T. augustifolia, and P. australis by 185, 216, and 108 %, respectively; and its P uptake value increased by 300, 355, and 211 %, respectively. Earthworms could enhance photosynthetic activity, density, and biomass of wetland plants in constructed wetland, resulting in the higher N and P uptake. The addition of E. fetida into constructed wetland increased the removal efficiency of TN and TP by 10 and 7 %, respectively. The addition of earthworms into vertical flow constructed wetland increased the removal efficiency of TN and TP, which was related to higher photosynthetic activity and N and P uptake. The addition of earthworms into vertical flow constructed wetland and plant harvests could be the significantly sustainable N and P removal strategy.
本研究调查了在引入蚯蚓（Eisenia fetida）的人工湿地中，三种湿地植物（美人蕉、芦苇和蒲草）的生物量、密度、光合作用活性以及氮（N）和磷（P）的积累情况。还研究了人工湿地中 N 和 P 的去除效率。结果表明，当存在蚯蚓时，美人蕉和蒲草的光合速率（Pn）、蒸腾速率（Tr）和气孔导度（Scond）显著升高（p<0.05）。添加 E. fetida 分别使美人蕉、芦苇和蒲草地上部分的 N 吸收值增加了 185%、216%和 108%；P 吸收值分别增加了 300%、355%和 211%。蚯蚓可以增强人工湿地中湿地植物的光合作用活性、密度和生物量，从而提高 N 和 P 的吸收。添加 E. fetida 分别将 TN 和 TP 的去除效率提高了 10%和 7%。向垂直流人工湿地中添加蚯蚓增加了 TN 和 TP 的去除效率，这与更高的光合作用活性和 N 和 P 吸收有关。向垂直流人工湿地中添加蚯蚓和植物收获可能是一种可持续的 N 和 P 去除策略。
