[Ecological characteristics of phytoplankton in waters of biological-controlling and ordinary rice fields].
Through investigations from March to June 1998 on the phytoplankton in waters of biological-controlled and ordinary rice fields, 112 species of phytoplankton were found, of which, Bacillariophyta, Euglenophyta and Chlorophyta were dominant. The comparison of the species in two rice fields showed that in biological-controlled rice field, there were more species of Euglenophyta, with 5 most dominant species, i.e., 2 of Euglenophyta, 2 of Bacillariophyta and 1 of Chlorophyta. In ordinary rice field, there were more Bacillariophyta species, in which, 5 most dominant species belonged to Bacillariophyta, except Scenedesmus bijuga to Chlorophyta. The biodiversities of phytoplankton and their evennesses were also analyzed with the period from the seedlings being planted to the rice fields being dried, showing that a little increase in their biodiversity mainly caused by the increase of species number and an evident decrease in their evennesses.
Liu
W
W
Life Science School, Zhongshan University, Guangzhou 510275.
Wang
Y
Y
Xu
R
R
D017753:Ecosystem; D012275:Oryza / Q000502:physiology*; D010572:Pest Control, Biological; D010839:Phytoplankton / Q000145:classification / Q000502:physiology*; D014867:Water / Q000502:physiology
D014867:Water