摘要
为研究草-溞生物组合对农田周边富营养化水体中浮游植物的影响,以大型溞(Daphnia magna)作为滤食性动物代表,狐尾藻(Myriophyllum aquaticum)和金鱼藻(Ceratophyllum demersum)作为沉水植物代表,考察单一生物及2种生物组合对农田周边富营养化水体的修复作用。结果表明,大型溞对浮游植物密度、蓝藻门密度、叶绿素a浓度及微囊藻毒素抑制显著,且低密度(25 ind/L)抑制作用较强,试验后期(15~20 d)抑制作用减弱,试验结束(20 d)时,高密度(100 ind/L)处理中微囊藻毒素含量与对照无显著差异。狐尾藻和金鱼藻均能抑制浮游植物密度、蓝藻门密度和叶绿素a浓度的上升,且狐尾藻抑制效果更优,而金鱼藻对微囊藻毒素含量无显著抑制作用。试验结束时,在相同溞密度和植物种类条件下,草-溞联合较单一大型溞和单一植物抑制效果更优,且以低密度大型溞+狐尾藻最优。草-溞联合相比单一溞处理,可有效改善其在处理中产生的微囊藻毒素含量后期反升现象。
To study on the effects of phytoplankton in eutrophic water around farmland by aquatic plants and Daphnia magna,the combination of two organisms on the restoration of eutrophic water were investigated by taking Daphnia magna as the representative of filter-feeding animals,Myriophyllum aquaticum and Ceratophyllum demersum as the representatives of submerged plants.The results showed that D.magna significantly inhibited phytoplankton density,cyanobacteria density,chlorophyll-a concentration and the con⁃tents of microcystin,and the low density(25 ind/L)group had better inhibitory effects.In the late period of the test(15 d to 20 d),the inhibitory effect was weakened.At the end of the test(20 d),there was no significant difference in the contents of microcystins be⁃tween the high density(100 ind/L)group and the control group.Similarly,both M.aquaticum and C.demersum could inhibit the in⁃crease of phytoplankton density,cyanobacteria density and chlorophyll-a concentration,and the inhibitory effect of M.aquaticum was better.However,C.demersum had non-significancant inhibition effect on the contents of microcystin.At the end of the experiment,the submerged plants and D.magna combination had stronger inhibitory effect than the single D.magna and single plant,and the com⁃bination of low-density D.magna and M.aquaticum was the best.Compared with the single D.magna treatment,the submerged plants and D.magna combination can effectively control the rise of the microcystin produced in the late stage.
作者
张春雪
魏孝承
王晗阳
郑向群
杨波
ZHANG Chun-xue;WEI Xiao-cheng;WANG Han-yang;ZHENG Xiang-qun;YANG Bo(Agro-Environmental Protection Institute,Ministry of Agriculture and Rural Affairs,Tianjin 300191,China;Tianjin Chengjian University,Tianjin 300384,China)
出处
《湖北农业科学》
2021年第3期42-49,共8页
Hubei Agricultural Sciences
基金
中国农业科学院科技创新工程项目(2021-cxgc-zxq)。
