水生生物学报2019，Vol.43Issue(2)：439-447,9.DOI:10.7541/2019.054
氮浓度对铜绿微囊藻、大型溞和金鱼藻三者相互作用的影响
IMPACTS OF NITROGEN CONCENTRATION ON THE INTERACTIONS AMONG MICROCYSTIS AERUGINOSA, DAPHNIA MAGNA AND CERATOPHYLLUM DEMERSUM
摘要
Abstract
To evaluate the impacts of nitrogen concentration on both biomanipulation and the competition between algae and water grass, Microcystis aeruginosa, Daphnia magna and Ceratophyllum demersum were selected for experiments to represent phytoplankton, zooplankton and submerged macrophyte, respectively. When two or three of them were cultured together, the changes of growth rate and removal rate of nitrogen and phosphorus were observed with the phosphorous concentration of 1.5 mg/L and 5 different nitrogen concentrations (0.5, 2, 4, 8 and 16 mg/L, prepared with KNO3 solution), under temperature of 25℃, illumination of 2600 lx, light dark ratio 14h﹕10h. The results indicated that when M. aeruginosa was cultured separately, its growth rate effectively reduced with a nitrogen concentration less than 1.97 mg/L. When D. magna and M. aeruginosa were co-cultured, the nitrogen concentration which D. magna could effectively control algae was from 0.5 to 4 mg/L. However, the nitrogen concentration which C. demersum could effectively control algae was from 0.5 to 2 mg/L, when C. demersum and M. aeruginosa were co-cultured. When nitrogen concentrations were at 0.5 and 2 mg/L, the cell densities of M. aeruginosa were 23.89％ and 21.51％, respectively, of that when D. magna and M. aeruginosa were co-cultured at the last of experiment. So the effect of algae control was better when C. demersum and M. aeruginosa were co-cultured. The algae could be effectively controlled with nitrogen concentration from 0.5 to 16 mg/L, when D. magna, C. demersum and M. aeruginosa were co-cultured, under which the effect of algae control was the best. Especially, the growth rate of M. aeruginosa was all negative and significantly lower than those of D. magna and C. demersum when nitrogen concentration was bewteen 0.5 and 4 mg/L. In the coculture environment of D. magna and M. aeruginosa, with the addition of large submerged macrophyte, the effect of algae control could effectively enhance, and the nitrogen and phosphorus in the water could be decreased, which can effectively improve the water quality over the long term.关键词
氮浓度/铜绿微囊藻/大型溞/金鱼藻/生物操纵Key words
Nitrogen concentration/Microcystis aeruginosa/Daphnia magna/Ceratophyllum demersum/Biomanipulation分类
生物科学引用本文复制引用
姜小玉,赵闪闪,褚一凡,陈艳,李杲光,靳同霞,马剑敏..氮浓度对铜绿微囊藻、大型溞和金鱼藻三者相互作用的影响[J].水生生物学报,2019,43(2):439-447,9.基金项目
河南省重点科技攻关项目(152102310087) （152102310087）
河南省自然科学基金(182300410147)资助 （182300410147）
