Floristic composition, community structure, diversity and biomass of trees species in three forest reserves at Pulau Pangkor, Perak, Malaysia by Z., Ahmad Fitri, I., Faridah Hanum, Saari, Nurul Shida, M., Morazlinda, N. A., Nik Norafida, Latiff, A., Ludin, Rosni, Kamaruddin, Kamarulizwan, N. H., Nik Hazlan