Abstract：Simulated indoor experiments were conducted to investigate the fate of excess exogenous nitrate nitrogen and the effects of growing Myriophyllum spicatum on the migration and conversion of exogenous 15N by using the isotope labelling technology in microcosm. The results suggested that in a twelve-day experiment the percentage of exogenous nitrate nitrogen removed by denitrification, microorganism, submerged plants, dissimilatory nitrate reduction to ammonium (DNRA) and conversion to dissolvable organic nitrogen (DON) was 47.54%, 25.24%, 12.76%, 0.52% and 1.21%, respectively. in the treatment group (planted group), while in the unplanted group (control group), the percentage of exogenous nitrate nitrogen removed by denitrification, microorganism, DNRA and DON was 32.74% 30.79%, 0.54% and 5.83%, respectively. About 87.24% and 69.90% of the exogenous 15N was transformed in planted and unplanted groups, respectively during the twelve-day experiment. According to our finding, denitrification is the main pathway for nitrate nitrogen removal, followed by microorganism immobilization. M. spicatum also plays an important role in the removal of nitrate nitrogen, but the effects of DNRA and DON is relatively poor. To sum up M. spicatum promotes denitrification, accelerates the migration and conversion of nitrate nitrogen, which directly or indirectly accelerates the removal of exogenous nitrate nitrogen in the microcosm.
杨文斌, 李阳, 孙共献. 穗花狐尾藻对外源15N在水-沉积物界面迁移转化的影响[J]. 中国环境科学, 2015, 35(6): 1855-1862.
YANG Wen-Bin, LI Yang, SUN Gong-Xian. Effects of Myriophyllum spicatum L. on the migration and conversion of exogenous 15N at the water-sediment interface. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(6): 1855-1862.
