Article Per Year (5 Year)
p-Index From 2021 - 2026
0.23
P-Index
This Author published in this journals
All Journal Journal of Tropical Life Science : International Journal of Theoretical, Experimental, and Applied Life Sciences Biodidaktika : Jurnal Biologi dan Pembelajarannya
Viky Vidayanti
Biology Department, Faculty of Mathematics and Natural Sciences, Brawijaya University, Malang, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Education Environmental Science Immunology & microbiology Social Sciences Other

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
The Capability of Equisetum ramosissium and Typha angustifolia as Phytoremediation Agents to Reduce Nitrate-Phosphate Pollutants and Prevent Microcystis Blooming in Fresh Water Ecosystem Viky Vidayanti; Catur Retnaningdyah; Soeharjono Soeharjono
Journal of Tropical Life Science Vol. 2 No. 3 (2012)
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The aim of this study is to find out the kind of hydromacrophyte composition having the highest capability to reduce nitrate-phosphate pollutant and Microcystis growth in phytoremediation media using Equisetum ramosissium, Typha angustifolia and the combination of both. Microcystis were obtained from Sutami reservoir, then being inoculated in a media grown by hydromacrophytes (E. ramosissium, T. angustifolia and both of the hydromacrophytes) in the batch culture system. The number of Microcystis was counted every day within fifteen days. Abiotic factors were observe, including the concentration of nitrate using brucine-colorimetry method and orthophosphate (dissolved phosphate) using stannous chloride-colorimetry method on day 0, 6th, 12th and 15th. The growth rate of Microcystis carrying capacity and orthophosphate-nitrate levels among treatments were analysed by ANOVA test. The results showed that E. ramosissium and T. angustifolia in mono and polyculture techniques had similar potentiality to reduce the nitrate and ortophosphate. The concentrations of nitrate and orthophosphate decreased over 70 % in the 6th day after incubation. All of the treatments were able to reduce the carrying capacity of Microcystis up to 46 % , but the growth rates were similar in all media, that is, around 97-170 cells/L/day. Keywords: Equisetum ramosissium, Microcystis, nitrate, phosphate, Typha angustifolia
Mapping and Analysis of Mangrove Ecosystem Changes Using Satellite Imagery Based on Ground Stock Carbon Canopy Cover of Mangrove Ecosystems Penunggul, Pasuruan Sandrina Zhafira Jahja; Viky Vidayanti; Muhammad Yusuf
Biodidaktika : Jurnal Biologi dan Pembelajarannya Vol 21, No 2 (2026)
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/biodidaktika.v21i2.37854

Abstract

The Penunggul mangrove ecosystem has undergone continued rehabilitation, but the extent to which recent spatial changes reflect changes in aboveground carbon remains unclear. This study evaluated changes in mangrove extent and canopy-density classes between 2021 and 2025, estimated aboveground carbon stock (AGC) using the InVEST model and field-based allometry, and examined the relationships of NDVI and field-measured canopy cover with plot-level AGC. Sentinel-2 imagery was classified using a Random Forest algorithm, while vegetation structure and canopy cover were measured in ten field plots. Mangrove area increased from 18.94 ha in 2021 to 19.95 ha in 2025 (an increase of about 1.01 ha, or 5.33%), accompanied by an expansion of the high-density canopy class from 16.62 to 18.37 ha. The classification produced apparent Overall Accuracy and Kappa coefficients of 1.00 in the validation dataset. Field measurements recorded tree and sapling densities of 3,460 and 1,100 individuals ha⁻¹, respectively, with Rhizophora mucronata as the dominant taxon. Field-derived AGC was 71.92 Mg C ha⁻¹, whereas the 2025 InVEST estimate reached 280.10 Mg C ha⁻¹, indicating substantial overestimation by the class-based model. NDVI showed virtually no relationship with field-derived AGC, while canopy cover exhibited a positive linear association that was not supported by the Spearman correlation and should therefore be interpreted cautiously. These findings indicate that Sentinel-2 and InVEST are useful for assessing broad spatial patterns, but field measurements and spatially matched validation remain necessary for reliable local carbon estimation.
Co-Authors Catur Retnaningdyah MUHAMMAD YUSUF Sandrina Zhafira Jahja Soeharjono Soeharjono