Preliminary study on the relationship between seasonal dynamics of microfauna in the root system of water hyacinth and their effects on the purification of waterbody
凤眼莲根系微型动物群落的季节动态与净化效能的关系初探

Seasonal variation characteristics of micro fauna inthe root system of water hyacinth has been primarily studied when it was used to treat sewagewater from the Beijing Zoo. 70 species of micro-fauna was found in the water-root system in1992, with the largest number of 60 species in 49genera August. Biomass (by relative quantityan4 averal wet weight) of microfauna was heavier in July and August, and the weight percentage of protozoa in the same two months were76. 9% and 64. 1%. The dominant species (population) examined in each month (June to Octo-ber) was reported. The main physical and chemical indexes such as TN, TP and BOD varied seasonally. The removal of TSS was up to 82. 9%and those of BOD and TP were 66. 6% and 91.6%. This study demonstrates that the purifyingefficiency of water-hyacinth system was in a relationship with the seasonal characteristics of themicrofauna built up in its rootsystem.