Abstract:

For making clear the geographic variance of gutta-percha content in Eucommia ulmoides samara so as to provide scientific guide for developing high yield gutta-percha industrialization base, studies were carried out on 16 producing areas from the main planting areas and introduction areas. Typical sample-tree selection and random selection were applied in this study. Integrated extraction was applied for the gutta-percha content rate test. The results showed that outstanding difference of gum content existed among samaras from different producing areas. The change of gum content in samara had a close relationship with its habitat. On the whole, gum content decreased gradually along with the latitudinal increase. Higher latitude, more sunlight hours and higher pH value made against the formation of gutta-percha in seed that resulted in lower gum content. On the other hand, higher gutta-percha content was observed from the area where there were higher precipitations.

Key words: samara of Eucommia ulmoides, producing area, gutta-percha, difference