Mangrove species diversity and carbon stock in silvofishery ponds in Deli Serdang District, North Sumatra, Indonesia

Abstract

Abstract. Harefa MS, Nasution Z, Mulya MB, Maksum A. 2021. Mangrove species diversity and carbon stock in silvofishery ponds in Deli Serdang District, North Sumatra, Indonesia. Biodiversitas 23: 655-662. Mangrove-based silvofishery ponds are promoted as a win-win solution for biodiversity conservation, climate change mitigation as well as income generation for coastal communities. This study aimed to analyze the species diversity and carbon stock of mangrove vegetation in silvofishery ponds in Tanjung Rejo Village, Percut Seituan Sub-district, Deli Serdang District, North Sumatra, Indonesia. Data of the mangrove species were obtained using vegetation analysis, and the potential carbon stock was estimated based on allometric equations of both above- and below-ground tree biomass. For this purpose, plot samples from 22 silvofishery ponds were taken by establishing 5 aligned circular plots, each with a radius of 5.64 m, perpendicular to the coastline and with a distance of 15 meters between their perimeters. The results show that the mangrove species with the highest Importance Value Index (IVI) was Rhizophora apiculata (122.05%), followed by Excoecaria agallocha (42.29%) and Avicennia marina (36.84%), and the lowest IVI was Sonneratia caseolaris (1.48%). Higher IVI values indicate a larger carbon deposit from mangrove vegetation in silvofishery ponds. Our results indicate that mangrove area coverage of 44-80% per hectare in silvofishery ponds can deposit 40-50 tonnes of carbon per hectare and have greater potential carbon stock compared to coverage below 40%. The mangrove management activities with the sylvofishery scheme have a good impact on the community's economy and also maintain the existence of mangroves as carbon storage.

Spatial distribution of mangrove health index on three genera dominated zones in Benoa Bay, Bali, Indonesia

“…However, species composition in Benoa Bay's Rhizophora zone had a higher species number than Mare Island (Akbar et al 2016), Jakarta Bay , Situbondo, East Java (Hariyanto et al 2019), Mantehage-Paniki Islands, North Sulawesi (Opa et al 2019) and Cirebon (Purwanto et al 2022) were only found five true mangrove species. Several mangrove species were co-dominantly identified with Rhizophora, such as A. alba, B. hainesii, B. parviflora, E. agallocha, H. littoralis, L. littorea, S. hydrophyllacea, S. ovata and X. moluccensis, as found in Riau (Prianto et al 2006), and A. officinalis, B. cylindrica, B. sexangula, S. caseolaris in North Sumatra, Indonesia (Harefa et al 2022). The importance value index of the Rhizophora genus in this zone was 217.23%, while the cumulative IVI of other species was only 82.77% (Figure 4).…”

Mapping of mangrove forest and carbon stock estimation of east coast Surabaya, Indonesia

“…The estimated carbon stock from AGB in this study was relatively higher compared to other locations in Indonesia, for example in Lamongan East Java (53.89 ton C ha -1 ), Tanakeke South Sulawesi (37.6 ton C ha -1 ) and Deli Serdang North Sumatra (40-50 ton C ha -1 ) (Asadi et al 2017;Cameron et al 2019;Harefa et al 2022). The abovementioned locations have similarities in the growth of rehabilitated mangrove areas at a relatively young age (<30 years).…”

Empowerment of Abandoned Ponds for Sustainable Mangrove Rehabilitation Activities in Percut Sei Tuan, Deli Serdang, Indonesia

“…The physical condition of mangrove vegetation can reveal the density of the ecosystem. This condition requires an environmental form that can be identified using various parameter values such as stem diameter, height, dominance, relative dominance, frequency, and relative frequency [10]. Vegetation data were analyzed to measure the relative values of density, frequency, abundance, and species dominance.…”