Wang Bing, Wen Fen-Xiang, Xiao Bo
College of Environmental Science and Resources, Shanxi University, Taiyuan 030006, China.
Research & Development Center for Grass and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China.
Huan Jing Ke Xue. 2016 Sep 8;37(9):3447-3452. doi: 10.13227/j.hjkx.2016.09.024.
In order to provide references for the application of emergent plants in the remediation and restoration of aquatic ecosystems, a hydroponic experiment was conducted for L. with different nitrate mass concentrations (i. e., 10.68, 23.88, 42.22, 63.33, 82.92, 97.13 mg·L). The effects of nitrate mass concentration in water on the growth and nitrogen absorption capacity of were evaluated by the aboveground biomass, belowground biomass, root-shoot ratio, chlorophyll content, nitrogen uptake, and nitrate removal efficiency of the plants. The following results were obtained from the experiment. 1 The effects of nitrate mass concentration on the aboveground (stems and leaves) growth of the were greater than that on the belowground (roots) growth. Compared with the values before the experiment, the root-shoot ratio of the increased in the treatment with 10.68 mg·L of nitrate mass concentration; while the root-shoot ratio decreased in the treatments with 42.22-97.13 mg·L of nitrate mass concentration. 2 The grew better with nitrate mass concentration ranging from 23.88 mg·L to 63.33 mg·L; and the chlorophyll biosynthesis of the plants was inhibited in the treatments with 10.68, 82.92, and 97.13 mg·L of nitrate mass concentration. 3 The total nitrogen accumulation of the was in range of 10.56-75.43 mg in the experiment, which increased with the increase of nitrate mass concentration; and the accumulation of nitrogen in the belowground parts was 7.2, 2.3, 2.5, 2.1, 1.6, and 1.5 times of that in the aboveground parts, respectively. 4 The nitrogen utilization efficiency of the aboveground parts was higher than that of the belowground parts. 5 The removal rates of nitrate by were 94.9%-99.3%, which increased with increasing nitrate mass concentration. The nitrate mass concentration in water decreased with time in exponential function. In conclusion, has promising performance in the removal of nitrate in water, but its growth, nitrogen adsorption, and nitrate removal rate were significantly affected by the nitrate mass concentration. Moreover, the response of growth and nitrogen adsorption in aboveground of to nitrate mass concentration was more sensitive than that in belowground.
为了为挺水植物在水生生态系统修复与恢复中的应用提供参考，开展了不同硝酸盐质量浓度（即10.68、23.88、42.22、63.33、82.92、97.13mg·L）下某植物的水培实验。通过植物的地上生物量、地下生物量、根冠比、叶绿素含量、氮吸收量以及硝酸盐去除效率，评估了水中硝酸盐质量浓度对该植物生长和氮吸收能力的影响。实验得出以下结果：1. 硝酸盐质量浓度对该植物地上部分（茎和叶）生长的影响大于对地下部分（根）生长的影响。与实验前的值相比，硝酸盐质量浓度为10.68mg·L的处理中该植物的根冠比增加；而在硝酸盐质量浓度为42.22 - 97.13mg·L的处理中根冠比降低。2. 硝酸盐质量浓度在23.88mg·L至63.33mg·L范围内时该植物生长较好；在硝酸盐质量浓度为10.68、82.92和97.13mg·L的处理中植物的叶绿素生物合成受到抑制。3. 实验中该植物的总氮积累量在10.56 - 75.43mg范围内，随硝酸盐质量浓度的增加而增加；地下部分的氮积累量分别是地上部分的7.2、2.3、2.5、2.1、1.6和1.5倍。4. 地上部分的氮利用效率高于地下部分。5. 该植物对硝酸盐的去除率为94.9% - 99.3%，随硝酸盐质量浓度的增加而增加。水中硝酸盐质量浓度随时间呈指数函数下降。总之，该植物在去除水中硝酸盐方面具有良好性能，但其生长、氮吸附和硝酸盐去除率受硝酸盐质量浓度显著影响。此外，该植物地上部分生长和氮吸附对硝酸盐质量浓度的响应比地下部分更敏感。
