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富营养水体中总氮与总磷比对苦草生长的影响

文明章;郑有飞;吴荣军   

  1. 南京信息工程大学环境科学与工程学院, 南京 210044
  • 收稿日期:2007-05-31 修回日期:1900-01-01 出版日期:2008-03-10 发布日期:2008-03-10

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

WEN Ming-zhang; ZHENG You-fei; WU Rong-jun   

  1. College of Environmental Science and Engineering, Nanjing University of Science Information & Technology, Nanjing 210044, China
  • Received:2007-05-31 Revised:1900-01-01 Online:2008-03-10 Published:2008-03-10

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。

关键词: 祁连山, 苔藓青海云杉林, 灌木青海云杉林, 土壤水分

Abstract: 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 dverse 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.

Key words: Qilian Mountains, Moss-Picea crassifolia forestry, Shrub-Picea crassifolia forestry, Soil water