PENGARUH NAUNGAN TERHADAP PROSES EKOFISIOLOGI DAN PERTUMBUHAN SEMAI Shorea selanica (DC.) Blume DI PERSEMAIAN

Abstract

PENGARUH NAUNGAN TERHADAP PROSES EKOFISIOLOGI DAN PERTUMBUHAN SEMAI Shorea selanica (DC.) Blume DI PERSEMAIAN (Effect of Shading on the Ecophysiology Process of Shorea selanica (DC.) Blume at Nursery) Shorea selanica is one promising meranti species for commercial plantation, forest rehabilitation and reforestation purposes. Caused optimum light intensity for the seedling at nursery is unknown, the research effect some shading intensity on the seedling growth is necessary to be done. This research used completely randomized design of 4 treatments are : N0 = no shading (0%), N1 = shading intensity 55%, N2 = shading intensity 65% and N3 = shading intensity 75%. Each two seedling of S. selanica planted at mini plot (60 cm x 100 cm size) that closed with shading net above them. Each treatment consist 3 replication. The parameter are height and stem diameter, sum of leaf, rate of photosynthesis rapid, fresh and dry weight. Measurement was carried out in each one week, except for fresh and dry weight just carried at the end of this research (six week after planting). This results showed that application with shading intensity 65% gave the best influence for S. selanica seedling growth. The effect is very significant for height and diameter growth, fresh weight and dry weight of S. selanica seedling, with each average are 10,85 cm; 1,113 mm; 12,558 g and 3,463 g. Application sgading intensity 75% showed bad effect for seedling growth, less than no shading application or shading intensity 55%. Its suggested that S. selanica seedling were more tolerant with full sunlight and under storey condition with light intensity about 35%, but light intensity less than 35% will make their growth become slowly.