富营养水体中总氮与总磷比对苦草生长的影响  

Effects of TN:TP ratio in eutrophic water on the growth of Vallisneria spiralis

作　　者：文明章[1] 郑有飞[1] 吴莱军[1] 

机构地区：[1]南京信息工程大学环境科学与工程学院,南京210044

出　　处：《生态学杂志》2008年第3期414-417,共4页Chinese Journal of Ecology

基　　金：国家科技部"863"项目(2002AA601011);中国科学院知识创新战略行动资助项目(KZCXI-SW-12)

摘　　要：在室外受控实验条件下,研究了富营养水体中不同氮磷比(TN/TP)(12.5:1、25:1、50:1)对苦草(Vallisneria spiralis)生长的影响。结果表明:当TN/TP为25:1时,苦草的生长状态最好,苦草生物量的增长率最大,分别高于TN/TP为12.5:1和50:1时的54%和31%;当TN/TP为25:1时,附着生物尤其是附着藻类的生长状态最差,对苦草生长的不利影响最小;可见,富营养水体中适宜于苦草生长的TN/TP为25:1;TN/TP为25:1这一比例的应用具有相对性,当水体营养浓度低于限制水平时,该比例适用,如果水体中营养盐浓度超过限制水平时,该比例则不适用。In an outdoor controllable experiment, the effects of different TN： TP ratios （ 12.5： 1, 25： 1, and 50：1 ） in eutrophic water on the growth of Vallisneria spiralis were investigated. When the TN： TP ratio was 25： 1, V. spiralis had the best growth, with a biomass increment being 54% and 31% higher than that when the TN： TP ratio was 12. 5：1 and 50： 1, respectively, while the growth of periphyton, especially of epiphytic algae, was the worst, giving the least adverse effects on V. spiralis, indicating that a 25：1 of TN： TP ratio in eutrophic water was optimal for the growth of V. spiralis. However, such an optimal TN： TP ratio only worked when the nutrients concentration in eutrophic water was below the limited level, otherwise, it could be failed to be applicable.

关 键 词：富营养化 TN/TP 苦草 附着生物 形态指标 

分 类 号：X52[环境科学与工程—环境工程]