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All Journal Jurnal Ekologi, Masyarakat dan Sains Life Science
Andhina Putri Heriyanti
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Agriculture, Biological Sciences & Forestry Environmental Science

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Pengaruh Laju Injeksi Karbondioksida terhadap Oksigen Terlarut dan Pertumbuhan Spirulina platensis Al Anshori, Aziz; Sri Ngabekti; Andhina Putri Heriyanti; Amnan Haris
Life Science Vol. 13 No. 2 (2024): November 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/unnesjlifesci.v13.i2.14327

Abstract

Indonesia has a high and continually increasing total greenhouse gas emission. Carbon dioxide absorption can be mitigated by utilizing the photosynthesis process of microalgae. Spirulina platensis was chosen as the sample to be cultivated in this study due to its ease of cultivation and its status as a large-scale carbon dioxide absorber. The objective of this research is to analyze the effect of varying carbon dioxide injection rates on dissolved oxygen and the growth of S. platensis. This research employed an experimental method involving semi-mass cultivation using a 12 L volume tube photobioreactor (PBR) as a container with three treatment variations. These variations included culture P0 (without injection/control), culture PA (0.5 L/minute), and culture PB (1 L/minute). The data analysis revealed that the variation with an increase in dissolved oxygen levels and enhanced growth of S. platensis was most optimal in culture PB (1 L/min). One-way ANOVA results showed significant differences between culture P0 (without injection) and classified data indicating that culture PB (1 L/min) fell into a high-level classification. The average dissolved oxygen value for culture PB (1 L/min) was 7.9 mg/L, with a cell density average of 0.651 cells/ml and a dry biomass weight of 3.8 grams. The conclusion drawn is that varying carbon dioxide injection rates significantly affect dissolved oxygen levels and the growth of S. platensis, as evidenced by cell density and biomass calculations. The effect on the S. platensis culture is a notable increase in both parameters. The application of varying carbon dioxide injection rates in the cultivation of S. platensis may serve as a reference for identifying the optimal carbon dioxide injection rate during semi-mass cultivation.
Integration of Ecological Spirituality and Youth Participation in Reforestation Program: Laudato Si’ Movement Timor Leste Josue Willian; Abdul Jabbar; Andhina Putri Heriyanti
Jurnal Ekologi, Masyarakat dan Sains Vol 7 No 1 (2026): Jan-Jun 2026
Publisher : Yayasan Ekologi Masyarakat dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55448/k8b9qz07

Abstract

Deforestation in Timor-Leste persists at 10,000–12,000 hectares annually, yet reforestation research remains theoretically fragmented, emphasizing biophysical dimensions while neglecting the spiritual and attitudinal values that drive youth participatory environmental behavior. This study examines how ecological spirituality, operationalized through Laudato Si's three dimensions (spiritual, lifestyle, and societal), shapes environmental attitudes, mediates youth participation in reforestation, and produces ecological and social outcomes. Using a mixed-method light approach, 23 purposively selected informants participated in in-depth interviews and thematic analysis, complemented by land suitability assessments and plant survival measurements at two reforestation sites in Díli, Timor-Leste. Findings reveal that Laudato Si's three dimensions function as interconnected psychological mechanisms that progressively transform individual moral awareness into collective environmental action. Despite strong spiritual motivation, youth participation remained predominantly consultative (Arnstein's tokenism level) due to centralized decision-making and limited resource autonomy. Field assessments classified both sites as marginally suitable (S3), with plant survival rates of 50–80%; drought-tolerant neem (Azadirachta indica) achieved the highest survival rate (80%). This study introduces the ESYPESO Framework as a novel integrated analytical model empirically mapping causal pathways among ecological spirituality, environmental attitudes, participatory behavior, and ecological and social outcomes within a youth-led movement.
Co-Authors Abdul Jabbar Al Anshori, Aziz Amnan Haris Josue Willian Sri Ngabekti