摘要
选取4种不同生活型水生植物(漂浮植物凤眼莲、浮叶植物睡莲和菱角、沉水植物黑藻)为供试植物,在植物生长旺盛期(8月)和缓慢期(10-11月),通过静态模拟试验,综合考察4种水生植物对富营养化水体中铵态氮(NH+4-N)、硝态氮(NO-3-N)和总氮(TN)去除能力和水体通过微生物代谢活动释放气体(包括脱氮气体N2O、N2)及水体理化环境因素的影响。结果表明8月份各处理TN浓度下降速率显著高于10-11月份,且凤眼莲对水体氮素的去除能力最强。种植不同类型水生植物的水体中NO-3-N、TN下降速率为凤眼莲和菱角处理下降最快,黑藻处理下降最慢,睡莲处理略高于黑藻处理。不同类型水生植物释放气体量的顺序为黑藻处理>对照≈睡莲处理>菱角处理>凤眼莲处理。4种植物对调节水体理化环境因素的能力有所差异,这会间接导致其调节水体氮生物转化过程的程度差异。
In this study, through two series of simulation experiments [ vigorous growth period ( August) and slow growth period ( October to November) ] , four types of aquatic plants ( Eichhornia crassipes, Trapa, Nymphaea tetragona, Hydrilla verticillata) were compared in terms of their ability to remove NH4-N, NO-3-N and total nitrogen ( TN) , their in-fluence on gas production through microbial activities ( e. g. N2 O and N2 via nitrification and/or denitrification) , as well as their influence on physicochemical factors in water. According to the results, the removal efficiency of TN in water by all treatments was significantly higher in August than that in the period of October-November. E. crassipes showed the highest nitrogen removal rates. The reduction rates of TN and NO-3-N in water were the highest in treat-ments with E. crassipes, which were followed by Trapa, N. tetragona and H. verticillata. The gas production fol-lowed the order of H. verticillata>N. tetragona≈no-plant ( CK)>Trapa>E. crassipes. The ability of the four aquatic plants to regulate the environmental factors of eutrophic water varied, which indirectly led to the various abilities to regulate micro-bial nitrogen transformation processes.
出处
《江苏农业学报》
CSCD
北大核心
2015年第5期1045-1052,共8页
Jiangsu Journal of Agricultural Sciences
基金
国家自然科学基金项目(41471415)
江苏省科技支撑计划项目(BE2013436)
江苏省留学人员科技资助项目(苏人社:2014-323)
江苏省农业科技自主创新基金项目[CX(14)2093]
关键词
水生植物
富营养化水体
氮
植物修复
反硝化
aquatic plant
eutrophic water
nitrogen
phytoremediation
denitrification
