Sử dụng chỉ số quan trắc sinh học của hệ động vật đáy đánh giá chất lượng nước rừng Trà Sư - tỉnh An Giang

Abstract

This study aimed to evaluate the surface water quality based on the biological monitoring index BMWPVIET-ASPT, which derived from the diversity of zoobenthos in Tra Su mangrove forest. Through two surveys in rainy and dry seasons at 20 locations in the forest, were recorded 15 macroinvertebrates, which belonges to 15 genera, 15 families, 12 orders in 6 classes of the main groups including Mollusca, Annelida, and Arthropoda. There were no significant differences in species composition during the two seasons, but the number of individuals recorded in the rainy season (852 individuals) was higher than in the dry season (658 individuals). Survey results also showed that the species composition range from 2 to 11 species, depending on locations. The ASPT values from the zoobenthos diversity showed that the surface water quality was organic pollution from β–mesosaprobe to polysaprobe states. In dry season, 14/20 monitoring points were in polysaprobe state, meanwhile the ASPT values were decreased in rainy season but the number of polysaprobe points were increasing to 15/20 points. The results showed that the BMWPVIET-ASPT could apply to monitor the surface water quality at the static water bodies such as canal network inside Tra Su forest, An Giang province.