[Objective]This paper was to research the water purification mechanism of Ipomoea aquatica and its correlation with algae and rotifer. [Methods]Taking I. aquatica as the test material,Chlorella vulgaris,Scenedesmus ob...[Objective]This paper was to research the water purification mechanism of Ipomoea aquatica and its correlation with algae and rotifer. [Methods]Taking I. aquatica as the test material,Chlorella vulgaris,Scenedesmus obliquus,Microcystis aeroginosa and rotifer Adineta vaga with different densities were added to the hydroponics nutrients solutions of I. aquatica by the hydroponic ecological simulation method. The growth characteristics of I. aquatica,changes of microbial populations and the consumption status of nutrients in the nutritional solution were determined. And the interactions between the plant and the microbial populations were researched. [Results]When I. aquatica seedlings grew to a certain stage,growth of principal root stopped; while the lateral roots emerged greatly; and the nutrition absorption efficiency enhanced. As the inoculation concentration of C. vulgaris increased,root length of I. aquatica increased relatively great due to the competition for nutrients. The competition and allelopathy of M. aeroginosa and S. obliquus restricted the development of root system of I. aquatica. The grazing pressure of Chlorella vulgaris had little effects on M. aeroginosa,but restricted the rapid growth of S. obliquus. [Conclusions]This research provided data support for the application of fish-shrimp-vegetable aquaculture system.展开更多
本文通过对水蕹菜净化含银废水的室内外静、动态试验研究得出:(1)水蕹菜对离子态银(Ag^+)的去除速率高于对络合态银[Ag(S_2O_3)_2]^(3-)的去除速率即 K_(Ag)+>K[Ag(S_2O_3)_2]^(3-);(2)水蕹菜对银的净化率 R 与污水停留时间 t 呈指...本文通过对水蕹菜净化含银废水的室内外静、动态试验研究得出:(1)水蕹菜对离子态银(Ag^+)的去除速率高于对络合态银[Ag(S_2O_3)_2]^(3-)的去除速率即 K_(Ag)+>K[Ag(S_2O_3)_2]^(3-);(2)水蕹菜对银的净化率 R 与污水停留时间 t 呈指数函数关系(R=Ae^(B,t),A、B为常数,B<0),其表面去除负荷 P_S 则与 t 呈幂函数关系(P_S=At^B,B<0);(3)试验证明水蕹菜是生物净化含银废水的优良品种之一。展开更多
为研究水生动植物协同净化系统(褶纹冠蚌+水蕹菜+水稻)对鳜鱼养殖池塘水质与经济效益的影响,设计3个处理,分别为0-F组(对照组,无净化系统)、10%-F组(净化组,水蕹菜和水稻覆盖率各5%)和30%-F组(净化组,水蕹菜和水稻覆盖率各15%),净化组...为研究水生动植物协同净化系统(褶纹冠蚌+水蕹菜+水稻)对鳜鱼养殖池塘水质与经济效益的影响,设计3个处理,分别为0-F组(对照组,无净化系统)、10%-F组(净化组,水蕹菜和水稻覆盖率各5%)和30%-F组(净化组,水蕹菜和水稻覆盖率各15%),净化组中各塘褶纹冠蚌密度均为每667 m 250只。试验期间定期监测水质和蚌生长情况,结束时测定鳜鱼成活率、产量与水生植物收获量。结果显示:各处理组水温、pH值无显著差异,但净化组的透明度始终高于对照组;试验结束时,0-F组的总氮(TN)质量浓度比初始增加35.5%,10%-F组和30%-F组的TN质量浓度分别比初始时降低23.8%和49.0%,NH^(4+)-N质量浓度分别增加167%、53%和34%,COD_(Mn)质量浓度分别增加138.5%、100.0%和88.9%,各组总磷(TP)质量浓度随时间呈现波动式下降趋势;水质、鳜鱼成活率、产量和经济效益均以30%-F组最优,10%-F组次之,0-F组最差。10%-F组水蕹菜和水稻单产均高于30%-F组,蚌湿重增长率30%-F组高于10%-F组。总体而言,动植物协同净化系统可明显提升鳜鱼养殖池塘水质与经济效益,且植物覆盖率为30%的净化系统应用效果优于覆盖率为10%的净化系统。展开更多
基金Supported by the Fund of Tianjin Key Laboratory of Animal and Plant Resistance in Tianjin Normal University(No.52XS1209)Transformation and Extension Program of Agricultural Science and Technology Achievements in Tianjin City(No.201001040)Doctoral Fund of Tianjin Normal University(No.52LX30)
文摘[Objective]This paper was to research the water purification mechanism of Ipomoea aquatica and its correlation with algae and rotifer. [Methods]Taking I. aquatica as the test material,Chlorella vulgaris,Scenedesmus obliquus,Microcystis aeroginosa and rotifer Adineta vaga with different densities were added to the hydroponics nutrients solutions of I. aquatica by the hydroponic ecological simulation method. The growth characteristics of I. aquatica,changes of microbial populations and the consumption status of nutrients in the nutritional solution were determined. And the interactions between the plant and the microbial populations were researched. [Results]When I. aquatica seedlings grew to a certain stage,growth of principal root stopped; while the lateral roots emerged greatly; and the nutrition absorption efficiency enhanced. As the inoculation concentration of C. vulgaris increased,root length of I. aquatica increased relatively great due to the competition for nutrients. The competition and allelopathy of M. aeroginosa and S. obliquus restricted the development of root system of I. aquatica. The grazing pressure of Chlorella vulgaris had little effects on M. aeroginosa,but restricted the rapid growth of S. obliquus. [Conclusions]This research provided data support for the application of fish-shrimp-vegetable aquaculture system.
文摘本文通过对水蕹菜净化含银废水的室内外静、动态试验研究得出:(1)水蕹菜对离子态银(Ag^+)的去除速率高于对络合态银[Ag(S_2O_3)_2]^(3-)的去除速率即 K_(Ag)+>K[Ag(S_2O_3)_2]^(3-);(2)水蕹菜对银的净化率 R 与污水停留时间 t 呈指数函数关系(R=Ae^(B,t),A、B为常数,B<0),其表面去除负荷 P_S 则与 t 呈幂函数关系(P_S=At^B,B<0);(3)试验证明水蕹菜是生物净化含银废水的优良品种之一。
文摘为研究水生动植物协同净化系统(褶纹冠蚌+水蕹菜+水稻)对鳜鱼养殖池塘水质与经济效益的影响,设计3个处理,分别为0-F组(对照组,无净化系统)、10%-F组(净化组,水蕹菜和水稻覆盖率各5%)和30%-F组(净化组,水蕹菜和水稻覆盖率各15%),净化组中各塘褶纹冠蚌密度均为每667 m 250只。试验期间定期监测水质和蚌生长情况,结束时测定鳜鱼成活率、产量与水生植物收获量。结果显示:各处理组水温、pH值无显著差异,但净化组的透明度始终高于对照组;试验结束时,0-F组的总氮(TN)质量浓度比初始增加35.5%,10%-F组和30%-F组的TN质量浓度分别比初始时降低23.8%和49.0%,NH^(4+)-N质量浓度分别增加167%、53%和34%,COD_(Mn)质量浓度分别增加138.5%、100.0%和88.9%,各组总磷(TP)质量浓度随时间呈现波动式下降趋势;水质、鳜鱼成活率、产量和经济效益均以30%-F组最优,10%-F组次之,0-F组最差。10%-F组水蕹菜和水稻单产均高于30%-F组,蚌湿重增长率30%-F组高于10%-F组。总体而言,动植物协同净化系统可明显提升鳜鱼养殖池塘水质与经济效益,且植物覆盖率为30%的净化系统应用效果优于覆盖率为10%的净化系统。
