The Assessment Of Water Quality Of Bedadung River Upstream Using Trophic Diatom Index

Abstract

This study was conducted to assess the quality of the Bedadung river water that passes through forests, coffee plantations, rice fields and land-settlements with epilitic diatom bioindicators based on the Trophic Diatom Index value. Diatom samples were collected by brushing the surface of the rock submerged in river water, then the samples were identified and their abundance was determined. The physico-chemical parameters of river water that are measured include temperature, TP, DO, TDS, conductivity, turbidity and water discharge. The quality of land around the river is also determined by first recording the growing vegetation data. Diatom data were analyzed to determine the TDI index value to determine river water quality, vegetation data were analyzed to determine the index of environmental services. Furthermore, TDI data, environmental service index and physico-chemical parameters of river water are analyzed. Principle Component Analysis to determine the relationship between these components. The results showed that the water quality of the Bedadung river that passed through forests, coffee plantations, rice fields and land-settlements based on the TDI value was classified into the moderate eutrophic category because the TDI value ranged from 41-47. This TDI value is related to TP levels, water discharge and DO but not related to land quality around rivers, pH, TDS, conductivity, and temperature.

Keyword: TDI, epilithic diatom, river water quality, bioindicator