ANALISIS VEGETASI DAN POLA SEBARAN SALINITAS DI EKOSISTEM MANGROVE PERCUT SEI TUAN KABUPATEN DELI SERDANG SUMATERA UTARA (Vegetation Analysis and Distribution Pattern of Salinity in Mangrove Ecosystem Percut Sei Tuan, Deli Serdang Regency, North Sumatera) - Dafikri, Muhammad (Program Studi Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Sumatera Utara, 2016)