Diversity of Plant Species Composing The Vegetation of The Arboretum at The Kupang State Agricultural Polytechnic: KEANEKARAGAMAN JENIS TUMBUHAN PENYUSUN VEGETASI ARBORETUM POLITEKNIK PERTANIAN NEGERI KUPANG Badia Roy Ricardo Nababan, Firman Syah, Darmawana Takoy Jurnal Celebica : Jurnal Kehutanan Indonesia Vol. 7 No. 1 2026 DOI 10.65078/jc.v7i1.195