Open AccessTROPHIC STATUS BASED ON NITRATE, PHOSPATE AND CHLOROPHYLL-a IN THE IR. H. DJUANDA RESERVOIR, PURWAKARTA REGENCY, WEST JAVA
Author(s) -
Desi Aryani,
Lismining Pujiyani Astuti,
Amran Ronny Syam,
Ega Aditya Prama
Publication year - 2021
Publication title -
marlin
Language(s) - English
Resource type - Journals
ISSN - 2715-9639
DOI - 10.15578/marlin.v2.i1.2021.123-130
Subject(s) - eutrophication , environmental science , nitrate , hydrology (agriculture) , phytoplankton , water quality , nutrient , chlorophyll a , ecology , biology , geology , botany , geotechnical engineering
Ir H Djuanda Reservoir (Jatiluhur Reservoir) is the largest dam in West Java, with an area of 8,300 ha. This dam was built in 1957 by a French contractor, with a maximum depth of 90 meters and is the first multipurpose reservoir in Indonesia. The reservoir functions as hydropower, irrigation, marine cage, raw water and tourism. The number of anthropogenic activities encourages changes in the trophic status of the waters. The explosion of phytoplankton and floating aquatic plants is an indication of eutrophication in this lake. The purpose of this study was to determine the fertility conditions of the waters of the Ir. H. Juanda through the approach of nutrient values (nitrate and phosphate) and chlorophyll-a with TSI and TRIX analysis. This research was conducted in October 2019 at the Research Center for Fish Resource Recovery (BRPSDI) Purwakarta, West Java Province. Chemical parameters such as nitrate, phosphate and chlorophyll-a were analyzed in the laboratory using the spectrophotometric method. In addition, in-situ measurements were made of several physical and chemical parameters (temperature, brightness, depth and pH). The results showed that the reservoir waters of Ir. H. Djuanda is classified as eutrophic based on TSI with a value of 62.0337, to hypereutrophic based on TRIX with a value of 7.4581.KEYWORDS: Nitrate, Phospate, Chlorophyll-a, Eutrophication