The migration and dissolution of AgNPs in an aquatic system with plants was investigated.By using a hydroponic system with Eichhornia crassipes,the absorption and transportation processes of silver nanoparticles were ...The migration and dissolution of AgNPs in an aquatic system with plants was investigated.By using a hydroponic system with Eichhornia crassipes,the absorption and transportation processes of silver nanoparticles were investigated.The results show that AgNPs concentrations in the water phase declined with the increase in time,and the reduction degree was dependent on the initial concentrations of AgNPs.The silver concentrations in the roots(r=0.98,p<0.05),stems and leaves(r=1,p<0.001)were significantly positively correlated with the initial concentrations of AgNPs.Silver nanoparticles accumulated in plant roots more than stems and leaves.Compared with the addition of AgNO 3 at identical concentrations,lower removal rates of silver and plant uptake were observed in the AgNPs stress systems.A significant positive correlation was also found between the initial AgNPs concentrations and the removed amount of silver(r=0.99,p<0.001).For AgNPs,the primary removal mechanisms in these aquatic systems were agglomeration and sedimentation,while the absorption by plants had a relatively weak contribution.展开更多
The study aimed to develop a vertical crop cultivation system for leafy plants based on cylindrical hydroponics and light emitting diode (LED) technology. Investigations were conducted on growing lettuce (Lactuca s...The study aimed to develop a vertical crop cultivation system for leafy plants based on cylindrical hydroponics and light emitting diode (LED) technology. Investigations were conducted on growing lettuce (Lactuca sativa cv. "Rex", "Nanda" and "Canasta") indoors in a rotary system and Chinese cabbage (Brassica chinensis) in a multi-tier cylindrical hydroponics system under red and blue (RB) LED lightings. Light intensity from different light sources have an influence on the yield and growth behaviour of indoor lettuce. Photosynthetically active radiation (PAR) levels at 63 μmol/m2·s produced low fresh weights (FW) and leaf areas of lettuce "Rex" and "Nanda" were grown under rotating conditions. The effect was, however, different on the better developed "Canasta". Stem etiolation was a common occurrence under such influence. Chlorosis was not observed on all plant types grown under the LEDs. Cultivating Chinese cabbage plants (FW: 28 g/plant) in cylindrical units stacked vertically above another, increased planting density by 47% when compared to the rotary system,展开更多
基金The National Natural Science Foundation of China(No.51479034,5151101102)Fundamental Research Funds for the Central Universities(No.2242016R30008)
文摘The migration and dissolution of AgNPs in an aquatic system with plants was investigated.By using a hydroponic system with Eichhornia crassipes,the absorption and transportation processes of silver nanoparticles were investigated.The results show that AgNPs concentrations in the water phase declined with the increase in time,and the reduction degree was dependent on the initial concentrations of AgNPs.The silver concentrations in the roots(r=0.98,p<0.05),stems and leaves(r=1,p<0.001)were significantly positively correlated with the initial concentrations of AgNPs.Silver nanoparticles accumulated in plant roots more than stems and leaves.Compared with the addition of AgNO 3 at identical concentrations,lower removal rates of silver and plant uptake were observed in the AgNPs stress systems.A significant positive correlation was also found between the initial AgNPs concentrations and the removed amount of silver(r=0.99,p<0.001).For AgNPs,the primary removal mechanisms in these aquatic systems were agglomeration and sedimentation,while the absorption by plants had a relatively weak contribution.
文摘The study aimed to develop a vertical crop cultivation system for leafy plants based on cylindrical hydroponics and light emitting diode (LED) technology. Investigations were conducted on growing lettuce (Lactuca sativa cv. "Rex", "Nanda" and "Canasta") indoors in a rotary system and Chinese cabbage (Brassica chinensis) in a multi-tier cylindrical hydroponics system under red and blue (RB) LED lightings. Light intensity from different light sources have an influence on the yield and growth behaviour of indoor lettuce. Photosynthetically active radiation (PAR) levels at 63 μmol/m2·s produced low fresh weights (FW) and leaf areas of lettuce "Rex" and "Nanda" were grown under rotating conditions. The effect was, however, different on the better developed "Canasta". Stem etiolation was a common occurrence under such influence. Chlorosis was not observed on all plant types grown under the LEDs. Cultivating Chinese cabbage plants (FW: 28 g/plant) in cylindrical units stacked vertically above another, increased planting density by 47% when compared to the rotary system,