Progress of Crop in Some Rhizophora Stands before First Thinning in Matang Mangrove Reserve of Peninsular Malaysia

The study reports the composition and growth pattern of the crops dominated by Rhizophora species in terms of stocking density, diameter and height growth in some well-managed stands in Matang Mangrove Reserve of Peninsular Malaysia. In all, 10 stands representing 6 years (4), 9 years (3) and 12 years (3) were studied. On an average there were 8371,4661 and 4181 stems/ha of Rhizophora in 6, 9 and 12 year-old crops respectively. Mean DBH and height for the respective age crops were 3.26 cm and 6.34 m, 5.50 cm and 10.96 m and 6.91 cm and 12.62 m. Highest mortalityoccu"edin 6-9 year-old crop. This period also showed best growth both in diameter and height. These studies indicate the need for silvicultural thinning in 6- 9 year-old crop. The climber Derris trifoliata may seriously affect growth and survival in some areas