ĐA DẠNG THÀNH PHẦN LOÀI VI TẢO TRONG RUỘNG LÚA Ở XÃ LONG KIẾN, TỈNH AN GIANG

Abstract

Through three rice crops, surveying the composition of planktonic microalgae in the rice fields showed that there were 407 taxa belonging to 100 genera, 39 families, 17 orders and 4 phyla (Chlorophyta, Bacillariophyta, Euglenophyta and Cyanobacteria), of which Chlorophyta has the most diverse species composition structure. The highest number of algal species was observed in the 2017 Summer-Autumn rice crop, the 2016 - 2017 Winter - Spring crop and the 2016 Autumn - Winter crop, corresponding to 276, 223 and 88 species, respectively. It is the difference in habitat conditions that make up the diversity of microalgae species in the fields. In particular, Anabaena oscillarioides with heterocysts are capable of nitrogen fixation into the soil, which appeared a lot at the beginning of the tillering stage in Summer - Autumn 2017 rice.