Spatial distribution of kalantas (Toona calantas Merr. and Rolfe) and its associated species in the Molawin watershed, Mt. Makiling Forest Reserve, Philippines
2009
Castillo, L.A.
Vegetation inventory using a combination of belt transect and plot sampling method was conducted in the Molawin watershed, Mt. Makiling Forest Reserve to determine the spatial distribution and population of kalantas and its associated species. From the 1,081 individuals recorded in the 13 sampling plots established, 146 (13.3%) individuals are kalantas, 51 are trees and saplings and the remaining 95 individuals are seedlings. Majority of the seedlings spread from 0-20 m from the mother tree. The data also show that kalantas are distributed between 164 to 480 m asl. Further, the higher the altitude, the more kalantas. The highest number of seedlings was recorded at elevation near 480 m asl while the highest number of trees and saplings is recorded in Zone 2 with 34 individuals. The plot with the highest % organic matter had the most number of seedlings while Zone 2 with 60 ppm phosphorus had the highest number of kalantas trees and saplings. The TWINSPAN analysis reveals, kalantas is associated with baglikan, mabunot and magabuyo and strongly associated with tambalau. All prefer a habitat of low to medium altitudes in a primary forest. Conservation efforts are recommended for plots with mother trees (Plots 1, 2, 10 and 13) and for Plot 10 which contains the highest number of seedlings (Zone 3). Active protection measures and continuous monitoring should be done.
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