伊乐藻与狐尾藻、苦草和金鱼藻的竞争研究

在室外2m×2m的水池中同时种植伊乐藻、狐尾藻、苦草和金鱼藻4种沉水植物,观察其周年生长的长势、分布面积等情况,以了解各自竞争力强弱.结果表明.6-8月时,伊乐藻生长最快,扩张能力最强,从最开始的1.08 m2增长至8月份的3.69m2,其数量占4种沉水植物总数量的比例在6月份达到最高,为76.59％.7-9月时,狐尾...

Research on Competition of Elodea nuttallii with Myriophyllum verticillatum,Vallisneria natans and Ceratophyllum demersum

Four submerged macrophytes,Elodea nuttallii,Myriophyllum verticillatum,Vallisneria natans and Ceratophyllum demersum,were planted to observe the growth potentials and competitive abilities in outdoor 2m×2m pools.The areas of every species were 1.08m2.Results showed that from June to August,Elodea nuttallii grew fastest and its expansion ability was strongest.Its distribution area was 3.69m2 and the quantity proportion reached highest,76.59% in June.From July to September,Myriophyllum verticillatum had the advantage of canopy position,and floated on the surface.It could make full use of sunshine and its area reached 2.34m2,while its quantity proportion still increased,and reached the highest of 48.99% in October.At this period,Vallisneria natans grew in the middle and lower layer of the water body,meanwhile Elodea nuttallii degenerated because of heat and the lowest area reduced to 1.26m2.In autumn-winter and spring,because Elodea nuttallii had strong chillness-tolerance,its area increased to 3.20m2,which made it possess competition advantage in time and space,and directly affected competition pattern among the four plants.Overall,Elodea nuttallii occupied a distinct advantage in competition with native species,which should be paid attention to when introduced in northern China.