Abstract:
Objective To study the physicochemical properties and combustion characteristics of common tree species in Qinghai, and to evaluate the fire resistance of local tree species, so as to provide references for the selection of fire-resistant tree species in Qinghai.
Method The fire-resistance indexes of 10 tree species were divided into fire-resistance factor fa and combustion performance factor fb (including the extrinsic factor fb1 and the intrinsic factor fb2) by factor analysis. Through Pearson correlation analysis and partial correlation analysis, the relationship between the 9 physicochemical properties of the 10 tree species and the fire prevention factors was obtained. Finally, the fire-resistant performance of the 10 tree species was ranked by comprehensive analysis.
Result (1) There was a significant negative correlation between fb2 and the moisture content of leaves, between the burning point of bark and branches, and between fa, fb2 and the calorific value of leaves. (2) The results of partial correlation analysis showed that the moisture content of leaves had a significant negative correlation with fb2, and the fb2 had a significant negative correlation with fa. (3) The ranking similarity of fire performance of tree species based on the comprehensive values of combustion test and fire performance was 64%.
Conclusion The comprehensive fire-resistance evaluation model of the 10 tree species is established, and the order of fire-resistance is obtained based on different weight systems as Atriplex canescens > Armeniaca sibirica > Rosa xanthina> Caragana korshinskii > Syringa oblata Lindl. > Elaeagnus angustifolia > Hippophaerha mnoides > Amygdalus triloba > Sabina vulgaris > Picea crassifolia. The results are of practical application and popularization to the fire-resistance of tree species in Xining and its surrounding areas.
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