Relationship between Distribution of Submerged Macrophyte and Water Environment Factors in Baiyangdian Lake in Summer

Submerged macrophyte and main environmental factors of Baiyangdian Lake were investigated in late August, 2010, and canonical correspondence analysis(CCA) was used to research the relationship between distribution of submerged macrophyte and water environment factors. Ten species of submerged macrophytes were found and the dominant associations were Ass. Ceratophyllum demersum, Ass. Potamogeton pecti natus and Ass. Chara sp. Transparency and contents of dissolved oxygen and total phosphorus in the water were primary water environment factors that influencing the distribution of submerged macrophyte in Baiyangdian Lake. Ceratophyllum demersum and Potamogeton pectinatus were adaptable to adverse environmental stress and could exist widely in the water with worse water quality. Chara sp. was tolerant to stress of lower content of dissolved oxygen and distributed widely in Baiyangdian Lake. Potamogeton crispus was also adaptable to worse water quality and dominant in winter and spring. Najas Minor and Najas Marina could not be adaptable to adverse environmental stress and only exist rarely in the clean water.