A trophic state index for Laguna Lake in the Philippines | |
| Author | Roblo, Teresita M. |
| Call Number | AIT Thesis no.EV-82-20 |
| Subject(s) | Water quality--Philippines--Laguna Lake Water quality--Measurement |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | A multivariate approach was used to develop a trophic state index based on 9 parameters measured in Laguna Lake, Philippines. These include dissolved oxygen, transparency, turbidity, nitrate, zooplankton, phytoplankton, total dissolved solids, pH, and temperature. Principal factor analysis selected four trophic state variables (transparency, phytoplankton, nitrate and temperature) for inclusion in the index (TSI(PFA)). This index is interpreted according to Shannon's rating of trophic states of 0-10 passing from oligotrophy to eutrophy. Results of TSI (PFA) applied to Laguna Lake indicated a hypereutrophic state of the lake. Carlson-type of indexing was also attempted using nitrate (TSI(N03)). Further, Carlson's equation for TSI using secchi disc transparency (TSI(SD)) was directly used. However, seasonal results were contrary to seasonal trend results of TSI (PFA). This revealed that Laguna Lake has a different behavior from lakes considered by Carlson as regards the two parameters, hence, although TSI(N03) and TSI (SD) are simple and cheaply measured, they are nevertheless not applicable to Laguna Lake. |
| Year | 1982 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Environmental Engineering and Management (EV) |
| Chairperson(s) | Lohani, B.N. ; Omura, T. |
| Examination Committee(s) | Nguyen, Cong Thanh ; Chongrak Polprasert |
| Scholarship Donor(s) | Government of Australia |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1982 |