STUDIED ON POPULATION SIZE OF Cycas tansachana K.D. HILL & S.L. YANG IN KHAO PHRA BUDHTHABAT NOI COMMUNITY FOREST, KAENG KOI DISTRICT, SARABURI PROVINCE

Abstract

The study on population size of Cycas tansachana K.D. Hill & S.L. Yang in Khao Phra Budhthabat Noi Community forest, Kaeng Koi District, Saraburi Province had done by using strip transect method. Data collecting spent 2 times per year, in dry season for maturity male or maturity female stem density when male cone or female cone present and in rainy season during growth stage classification; seedling, immaturity and maturity stages. The surveying lines was done for 4 selected jungle trails, and sampling area covered 3.1% (0.152 km2) of totally area of Khao Phra Budhthabat Noi Community Forest which is about 4.8 km². The result showed the population size at 231.25 - 312.5 stems per km². The most threatened factors to population size of Cycas tansachana was illegal collection for large stems, the second followed young seeds and young leaves of seedlings that were destroyed by Long-tailed macaque. All data from this study could be used as basic information for more effective in situ conservation of Cycas tansachana in the future.