| Author | Manichanh Nammanivong |
| Call Number | AIT Thesis no.EV-03-27 |
| Subject(s) | Water quality biological assessment Laos
|
| Note | A thesis submitted in partial fulfillment of the requirements for the
Degree of Master of Science. |
| Publisher | Asian Institute of Technology |
| Abstract | A study of the benthic macroinvertebrates was carried out to assess the water quality of
the Nong Chanh Wetland in Lao P.D.R. Three stations were selected to represent the
various degree of contamination, from the nearest Khua Din Market and residential area as
station I, near the residential area station II, and far from the market and residential area
station III. The result of analysis showed that, there was no significant different (p>0.05) in
the measuring parameters of physical-chemical characteristics between the stations, except
phosphate concentrations. The higher value (1.56 mg/l), were observed nearby the market
place and residential area over the less polluted site (station III).
The total number of macroinvertebrates taxa were higher in station II and III than station I.
There was significantly higher in benthic macroinvertebrates abundance in station II than
station III and I. The three dominant taxonomic groups were Thiaridae, Chironomidae and
Oligicheata, while the Lymnaeidae was the lowest in number of population. Thiaridae,
Chironomidae and Oligocheata were dominant groups of station II. Thiaridae and
Chironomidae were dominant in May, whle Oligochaeta was dominant in August. This
may due to the availability of food enrichment and their living conditions.
Calculation of Shannon Diversity Index showed that, there were no different in diversities
of benthic macroinvertebrates between study stations I, II and III (1.490, 1.202, 1.525)
respectively.
Two biotic indices: BMWP and ASPT were suggested of water quality and confirmed that,
there were low in Biotic Indices (ASPT-score equal to 3.00) for all stations, which
indicated as very poor or bad water quality in this wetland. Non-point pollution therefore
detoriate not only water chemistry but also benthic macroinvertebrates characteristics and
community diversity in the wetland.
Due to the future of wetland improvement program, this study further strengthens the
viewpoint that wetland management consideration should be implemented to lessen the
impact on water quality as well as wetland ecosystem. Not should be made here that
chemical and physical characteristics alone seem not to be adequate to assess lake water
quality. Biological monitoring could be incorporated as indicated by this study. |
| Year | 2003 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Environmental Engineering (EV) |
| Chairperson(s) | Preeda Parkpian; |
| Examination Committee(s) | Nguyen Thi Kim Oanh;Satoh, Hiroyasu;Ikejima, Ko ; |
| Scholarship Donor(s) | Government of Sweden (Sida); |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2003 |