PARTISIPASI MASYARAKAT TERHADAP KEBERADAAN HUTAN MANGROVE DI DESA PERCUT KECAMATAN PERCUT SEI TUAN KABUPATEN DELI SERDANG (Society Participation Against the Existence of Mangrove Forest in Percut, Percut Sei Tuan Sub district, Deli Serdang Regency) - Nisa, Uswatun (Program Studi Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Sumatera Utara, 2016)