Pemodelan Status Trofik Danau Laut Tawar Aceh Tengah

Abstract

The trophic status of Laut Tawar Lake was increasingly leading to an alarming level of degradation. Efforts to anticipate an increase in trophic status require scientific knowledge of the trophic phenomena of the waters empirically. This research examines the trophic status parameters to produce a model of the trophic status of Laut Tawar Lake. The proposed model was a modification of Carlson's Trophic State Index Method. Analysis of the relationship examined the interaction of water clarity (SD) with chlorophyll-a (Chl), Total Suspended Solid, and Total Dissolved Solids, and the interaction of chlorophyll-a with nutrient concentration (TP, TN). Data were analyzed descriptively quantitatively, correlation, and regression. The results showed that the waters of Laut Tawar Lake contain phosphate (TP) 34 µg/L, Total Nitrogen 687 µg/L, chlorophyll-a 10 µg/L, Total Suspended Solid 47 mg/L, Total Dissolved Solid 84 mg/L, and water clarity 4.0 m. The regression test showed that the abundance of phytoplankton (Chl) was affected by nutrient phosphate with the empirical model equation Chl = 0.565 TP – 9.161. Nitrogen nutrients did not partially affect the concentration of chlorophyll-a in the waters of Laut Tawar Lake. Water clarity is influenced by chlorophyll-a and TSS, where TDS has no effect partially. The empirical model obtained is Ln SD = 1.757 – 0.013 Chl – 0.008 TSS. Modification of Carlson's TSI by substituting the two equations obtained the equation TSIdlt = 13.46 + 8.08 ln TP + 0.04 TP + 0.04 TSS. This model simulation gives an estimation rate of 91.06%.

Status Trofik Perairan Danau Laguna, Kota Ternate Selatan, Maluku Utara

“…Status trofik perairan merupakan fenomena kompleks yang tidak dapat diukur dari parameter tunggal. Secara umum status trofik dikategorikan ke dalam tiga yakni ologo, meso dan eutrofik (Adhar et al, 2022;Damayanti et al, 2022;Soeprobowati & Suedy, 2014).…”

Community structure of periphyton at floating net cages and non-floating net cages in Laut Tawar Lake, Aceh Tengah

“…The KJA station, which is located in Desa One-One, is a location with high activity in floating net cages and a residential area for residents, which allows for more periphyton life in that location. [27] stated that even though Laut Tawar Lake is an oligotrophic waters (poor in nutrients), the supply of nutrients that enter the waters is good for periphyton growth. This is supported by the opinion [28] stating that the presence of periphyton is an indicator in predicting the condition of a waters because the periphyton is relatively immobile and its life cycle is short, so that the periphyton is able to respond to changes in a waters.…”

Influence of Rainfall and Spatial Temporal Distribution Analysis of Total Suspended Solid in Laut Tawar Lake

“…Laut Tawar Lake has the potential to receive high TSS loading because 76.12% of the lake's catchment area has a Very Heavy Erosion Hazard Level [28]. The high rate of erosion of the catchment area will cause the amount of TSS to be transported into the lake more and more, where TSS is related to land sedimentation and river flow.…”