Abstract:

The correlation between microstructures of leaf and branch and its combustibility was studied by using the tree species with different fire resistance ability. The issue ratios of leaf, branch and nervation of ten species were measured. The species included Camellia sinensis, Eriobotrya japonica, Camellia oleifera, Viburnum amabuki, Photinia serrulata, Castanopsis sclerophylla, Ligustrum lucidum, Schima superba, Pinus massoniana and Cunninghamia lanceolata. The Cone Calorimeter was used to determine the fire resistance of all samples. The results showed that the structure of leaves has affected on its combustibility. The structure of broadleaf was benefit on the transportation and loss of water. The higher the ratio of nervation, the more favorable would be the water transportation. The ratio of spongy tissue to palisade tissue had distinct regression correlation with the fire occurrence index. The ratio of spongy tissue to palisade tissue of Camellia sinensis and Schima superba was high and their fire resistance was high. The microstructures of leaf affected its combustibility. The ratio of vessel was positive correlation with the fire resistance of branch.Schima superba and Viburnum amabuki had a high weight of vessel, and they had fire resistance.

Key words: Tree species, Microstructure, Combustibility