Simple Analysis on Change Features of Total Solar Radiation in Sanjiang Plain

The yearly,quarterly,monthly and daily change tendencies of total solar radiation at Jiamusi station of Sanjiang Plain were analyzed by statistical approach such as linear tendency estimate with its hourly ground meteorological observation data during 1986 to 2015.The research results indicated that the yearly tendency rate of total solar radiation was increasing obviously,with the velocity of 114.30 MJ/(m2·10 a),while the yearly total solar radiation was 3 667.28-4 935.88 MJ/m^2,and that of March to September was higher than the average.The summer total solar radiation was the most,followed by spring,and that of all the seasons increased except autumn which decreased.The daily total solar radiation increased rapidly from the last ten days of January and reached the peak at the end of June,while it plummeted from the beginning of September to the middle ten days of November,then tended to be gentle.The amount of 5-year total solar radiation was less after 1980s while it was more before1990s,and the total solar radiation was decreasing from 1996 to 2005 but on the contrary it kept increasing in recent ten years.Over the years the earliest record of solar radiation appeared at 05:00 and the latest at 20:00,and the daily variation of the hourly solar radiation got a normal distribution centered on 12:00 to 13:00.

铁基生物炭海绵与沉水植物协同净化水体中的氮磷

为探讨铁基生物炭海绵与沉水植物协同净化系统对农田退水中氮磷的去除效果,以苦草、伊乐藻、金鱼藻3种沉水植物和铁基生物炭海绵为材料,通过动态循环水模拟渠道的方式,研究不同净化系统对农田退水中总磷、总氮、氨氮的去除效果。结果表明:3种沉水植物均能在较高氮磷浓度农田退水中生长发育,株高及生物量有明显增长。在单一沉水植物净化系统中,金鱼藻对总磷的去除效率最高,达到29.85%,苦草对总氮的去除效率最高,为35.03%,金鱼藻对氨氮的去除效率最高,为83.09%。铁基生物炭与金鱼草协同净化系统对总磷和氨氮的去除效率最高,分别达到56.00%和91.86%,铁基生物炭与苦草协同净化系统对总氮的去除效率最高,为54.05%。研究表明,铁基生物炭海绵与沉水植物协同净化系统对氮磷的去除效果全面优于单一沉水植物净化系统。