Utilization of a new restoration technique for the rehabilitation of a degraded mangrove ecosystem: a case study from Koggala Lagoon, Sri Lanka
DOI:
https://doi.org/10.11609/jott.8153.15.9.23889-23897Keywords:
Allometric equations, carbon stocks, ecological function, eroded banks, growth rate, mangrove establishment, restoration techniqueAbstract
Mangrove ecosystems, amongst the most productive and biologically complex on Earth, are being degraded worldwide, and their widespread decline during the past decades has affected vital ecosystem services. Mangroves at Koggala lagoon on the southern coast of Sri Lanka have been degraded at an alarming rate due to agricultural practices, coastal zone development, and tourism activities. Most of the banks are heavily eroded due to boat and sea plane activities, and the mangrove ecosystem has been significantly damaged. Implementation of a scientific rehabilitation project was needed to restore this degraded mangrove ecosystem, and research was carried out to enrich the mangrove community by re-establishing mangroves on the eroded banks using corrosion-resistant plastic barrels. The sustainability of replanted mangroves was monitored under phase one and the re-establishment of ecological functions in the mangrove community was monitored under phase two. The accumulated biomass carbon during the period of two and half years was calculated by an allometric equation suggested for calculating biomass carbon of mangroves using the girth and height of individuals. The highest rate of girth increment was observed by the 24th month from establishment, whilst the growth rate declined between the 18th and the 30th months. During the study period, the average above-ground and below-ground biomass per barrel showed a linear increment. Our case study showed that the new method used for restoration is successful in establishing mangroves in sites with high erosion. This restoration technique was successful in coping with the situation in Koggala lagoon where previous restoration attempts were failures. Thus, we recommend this restoration method for sites facing the threat of severe erosion.
References
Alongi, D.M. (2014). Carbon sequestration in mangrove forests. Carbon Management 3(3): 313–322.
Donato, D.C., J.B. Kauffman, D. Murdiyarso, S. Kurnianto, M. Stidham & M. Kanninen (2011). Mangroves among the most carbon-rich forests in the tropics. Journal of Nature Geoscience 4: 293–297.
Duke, N.C., J.M. Kovacs, A. Griffith, L. Preece, D.J. Hill, P. Oosterzee, J. Mackenzie, H.S. Morning & D. Burrows (2017). Large-scale dieback of mangroves in Australia’s Gulf of Carpentaria: a severe ecosystem response, coincidental with an unusually extreme weather event. Journal of Marine and Freshwater Research 68(10): 1816–1829. https://doi.org/10.1071/MF16322
Edirisinghe, E.A.P.N., K.P. Ariyadasa & R.P.D.S. Chandani (2012). Forest Cover Assessment of Sri Lanka. The Sri Lankan Forester 34: 1–12.
Estrada, G.C.D. & M.L.G. Soares (2017). Global patterns of aboveground carbon stock and sequestration in mangroves. Annals of the Brazilian Academy of Sciences 89(2): 973–989. https://doi.org/10.1590/0001-3765201720160357
Feller, I.C., D.A. Friess, K.W. Krauss & R.R. Lewis III (2017). The state of the world’s mangroves in the 21st century under climate change. Journal of Hydrobiologia 803: 1–12. https://doi.org/10.1007/s10750-017-3331-z
Gunaratne, G.L., L. Tanaka, G.P. Amarasekara, T. Priyadarshana & J. Manatunge (2011). Impact of rubble mound groyne structural interventions in restoration of Koggala lagoon, Sri Lanka; numerical modelling approach. Journal of Coast Conservation 15: 113–121. https://doi.org/10.1007/s11852-010-0125-0
Gunawickrama, K.B.S. & E.P.S. Chandana (2006). Some Hydrographic aspects of Koggala Lagoon with preliminary results on distribution of the marine bivalve Saccostrea forskalli: pre-tsunami status. Ruhuna Journal of Science 1: 16–23.
Kodikara, K.A.S., N. Mukherjee, L.P. Jayatissa, F. Dahdouh‐Guebas & N. Koedam (2017). Have mangrove restoration projects worked? An in‐depth study in Sri Lanka. Restoration Ecology 25: 705–716. https://doi.org/10.1111/rec.12492
Ministry of Environment (2012). The National Red List 2012 of Sri Lanka; Conservation Status of the Fauna & Flora. Ministry of Environment, Colombo, Sri Lanka, viii + 476 pp.
Mukherjee, N., W.J. Sutherland, L. Dicks, J. Huge, N. Koedam & F. Dahdouh-Guebas (2014). Ecosystem Service Valuations of Mangrove Ecosystems to Inform Decision Making and Future Valuation Exercises. PLoS ONE 9(9): e107706. https://doi.org/10.1371/journal.pone.0111386
Nit, L.B.E. & P.P. Abit (2011). Growth and survival of mangrove seedlings under different levels of salinity and drought stress. Annals of Tropical Research 33(2): 107–129.
Perera, K.A.R.S., K.H.W.L. De Silva & M.D. Amarasinghe (2018). Potential Impact of Predicted Sea-Level Rise on Carbon Sink Function of Mangrove Ecosystems with Special Reference to Negombo Estuary, Sri Lanka. Journal of Global and Planetary Change 161: 162–177.
Prasanna, M.G.M. & K.B. Ranawana (2014). Guide to Mangroves of Sri Lanka. Biodiversity Secretariat, Ministry of Environment and Renewable Energy, Battaramulla, Sri Lanka, 70 pp.
Prasanna, M.G.M., K.B. Ranawana, K.M.G.G. Jayasuriya, P. Abeykoon & M. Ranasinhe (2017). Mangrove Species Distribution, Diversity and Present Status in the North and East Coast of Sri Lanka. Journal of Wild Lanka 5(3): 90–98.
Sahu, S.C., M. Kumar & N.H. Ravidranath (2016). Carbon Stocks in Natural and Planted Mangrove forests of Mahanadi Mangrove Wetland, East Coast of India. Current Science 110(12): 2253–2260. https://doi.org/10.18520/cs/v110/i12/2334-2341
Tomlinson, P.B. (1986). The Botany of Mangroves. Cambridge University Press, Cambridge, 225 pp.
Tomlinson, P.B. (2016). The Botany of Mangroves 2. Cambridge University Press, Cambridge, 436 pp.
Tsoularis, A. (2001). Analysis of logistic growth models. Research Letters in the Information and Mathematical Sciences 2: 23–46.
Wickramasinghe, S., M. Wijesinghe & C. Sarathchandra (2022). Sri Lankan Mangroves: Biodiversity, Livelihoods, and Conservation, pp. 297–329. In: Das, S.C., Pullaiah & E.C. Ashton, (eds.). Mangroves: Biodiversity, Livelihoods and Conservation. Springer, Singapore, 461 pp.
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