Study on physical and chemical properties of 10 evergreen broad leaf tree species

Evergreen broad-leaved tree species is the main species of forests, has the characteristic of high moisture content. Ten tree species, including Lithocarpus glaper, Alniphyllum tortunei, Ilex chinensis, Cinnamomum philippinense, Schima superba, Castanopsis fabri, Elaeocarpus decipiens., Castanopsis eyrei, Castanopsis sclerophylla, Camellia oleifera, were selected as the studied tree species. Theirs l eaves, twigs and barks were gathered, dried and crushed respectively. Then, theirs physicochemical properties were measured and analyzed in indoor. By using the seven indicators of various trees organs such as moisture content, calorific value, ignition, lignin, crude fiber, crude ash, crude fat as the evaluation factors, the cluster analyses on the ten trees' fire resistance were conducted. The results show that the strongest tree of fire resistance was ILexchinensis Sims, the stronger trees of fire resistance were the three kinds tree, ranked from strong to weak as follows: C. oleifera, E. decipiens, A.tortunei; the general tree of fire resistance were the two kinds of tree, from strong to weak was C. sclerophylla, L. glaper; the weaker treesof fire resistance were the four kinds, from strong to weak was S. superba, C. philippinense, C. eyrei and C. fabric. The findings can provide a theoretical basis for screening the fire resistant tree species.

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