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All Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology
Sigit Febrianto
Department of Aquatic Resources, Faculty of Fisheries and Marine Sciences, Universitas Diponegoro
Earth & Planetary Sciences Education

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SEAGRASS ORGANIC CARBON STOCK IN ALANG-ALANG BEACH, KARIMUNJAWA Patria Theda Ramadanti; Nurul Latifah; Agus Hartoko; Sigit Febrianto; Hadi Endrawati; Diah Ayuningrum
Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology Vol 18, No 3 (2022): SAINTEK PERIKANAN
Publisher : Fakultas Perikanan dan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijfst.18.3.163-168

Abstract

The research was conducted in Alang-alang beach, Karimunjawa, in December 2019. The research method used descriptive explorative. Sampling was carried out at 18 points on Alang-Alang beach using a purposive sampling method with the help of line transects and transect quadrants. Observation method seagrass using seagrass watch. The results of this study indicate that found four different types of seagrasses were in Alang-alang beach, Karimunjawa, namely Enhalus acoroides (Ea), Thalassia hemprichii (Th), Cymodocea rotundata, (Cr) and Cymodocea serrulata (Cs), with a kind of seagrass that dominate these waters are the type of Thalassia hemprichii. The highest seagrass density is on line 6, which is 256 shoot m-2 with Th as a dominant, and line 5 (238 shoot m-2) with Cr as a dominant. While, the lowest density is on line 1 (28 shoot m-2) with Ea as a dominant. In this research above ground biomass (1.35 g m-2) has a higher value than below-ground biomass (1.25 g m-2), with Ea having the highest biomass, while Cr has the lowest, but Cr has a high density. Therefore, the highest organic carbon stock (OCS) is Ea (103.216 g Corg m-2), while the seagrass species that has the smallest OCS is Th (61.562 g Corg m-2). The average organic carbon stock obtained was 35.07 g Corg m-2.
The Partial Pressure of CO2 and Fluxes of CO2 in Semarang Bay, Indonesia Max Rudolf Muskananfola; Nurul Latifah; Agus Hartoko; Sigit Febrianto; Johan Christian Winterwerp
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 28, No 1 (2023): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.28.1.113-124

Abstract

The CO2 characteristics of the Semarang Bay system on the Northern coast of Java were investigated to understand the roles in carbon dioxide flux. The flux of carbon dioxide at the sea surface between seawater and atmosphere is essential for mitigating atmospheric CO2.  The aims of this study were to assess the variation of CO2 partial pressure seawater (pCO2sea) and CO2 flux and to analyse the water quality variable which has the larger influence on CO2 flux in the waters of Semarang Bay. The variables in this study were temperature, pH, salinity, and DO. Different methods were adopted in the analysis of water samples: spectrophotometric to measure chlorophyll-a and phosphate and titration method to measure Total Alkalinity (TA) and Dissolved Inorganic Carbon (DIC). A CO2 meter was used to measure the CO2atm. The lowest CO2 flux value was (1.86 mmol CO2 m-2 day-1) during the morning period while the pCO2sea reached 461.04 μatm and CO2 flux 83.79 mmol CO2 m-2 day-1 at night. At noon time, with increased temperature, pCO2sea was 461.04 μatm, and CO2 flux was 83.79 mmol CO2 m-2 day-1. The high concentration of chlorophyll-a ranged between 3.55–4.11 mg.L-1.  This chlorophyll-a concentration has a negative correlation with CO2 flux, and it was found that TA and DIC concentrations have no relationship with CO2 flux. Based on PCA analysis, it was found that the variability of CO2 flux in Semarang Bay is influenced by the variability of pCO2sea, sea surface temperature and kwa (affected by wind speed).
Co-Authors Agus Hartoko Diah Ayuningrum Hadi Endrawati Johan Christian Winterwerp Max Rudolf Muskananfola Nurul Latifah Patria Theda Ramadanti