Mangrove Ecosystem Conditions In The Coast Teluk Pria Laot After Tsunami And Rehabilitation Efforts

Abstract

Earthquake of magnitude 9.0-9.3 MW, followed by a tsunami resulted a damage of infrastructure and mangrove ecosystems on the east coast of Weh Island. The damage of mangrove ecosystems was severe, and the locations are: 1. Pantai Taman Wisata Alam Alur Paneh; 2. Pantai Teluk Boih; 3. Pantai Lhok Weng 2/Teupin Layeu 1; 4. Pantai Lhok Weng 2b/Teupin Layeu 1b; 5.Pantai Lhok Weng 3/ Teupin Layeu 1; 6. Pantai Lhut 1; 7. Pantai Lhut 2; and 8. Pantai Lhok Weng 1/Lam Nibong. This type of damage, among others is, broken, fallen, uprooted and swept away. Mangrove ecosystem damage was caused by the incident run up of 5 meters and there no sandy hills protecting the coast. In this study the measurement transect square was made with three replications and soil sampling around the man- grove ecosystem, the outer side adjacent to the coastline and the inland boundary bordering the mangrove ecosystem. The measure- ment of transect quadrant was used to get Importance Value Index (IVI) and Survival Rate. Maximum density of mangrove ecosystems number of trees is 17 trees per 100m 2 and a maximum thickness of 238 m is located at Pantai LhokWeng3/TeupinLayeu2. The process from the level of Survival Rate was used to determine the number of saplings and trees that are needed in rehabilitation. The rehabilita tion of coastal mangroves is based on the length, density, thickness and survival rate. Types of species that are used for replanting are Rhizophora apiculata and Rhizophora stylosa species at a loca- tion that matches the type of clay sand-soil and sandy clay-soil