Surface vegetations are one of the key factors affecting the spread of green space fires.To explore the combustibility of commonly used local surface layer herbaceous species in Beijing,and to provide a reference for the construction and management of urban green space,we comprehensively evaluated the combustibility of Carex giral-diana,Carex breviculis,Liriope spicata,Iris lactea,Iris tectorum,and Buffaloe dactyloides,with the entropy weight method and K-mean cluster analysis based on the principal component analysis method.We measured the combus-tion characteristics indicators(blade ignition point,combustion time and heat release rate),physical and chemical indicators(leaf moisture content and crude fat content),and biological characteristics indicators(blade thickness and unit load)during the key period of fire prevention.The results showed that blade thickness and ignition point got the highest weight and affected the overall combustibility most.Peak heat release rate and ignition time had the lowest weight and minimal impact on the overall combustibility.The combustibility of the six species followed an order of B.dactyloides＞C.breviculmis＞L.spicata＞C.giraldiana＞I.lactea＞I.tectorum.Results of the cluste-ring analysis showed that the combustion ability of B.dactyloides,C.breviculmis,and L.spicata were in class I,with the strongest combustion ability;C.giraldiana was in class Ⅱ;I.lactea and I.tectorum were in class 11I,with the lowest flammability.As widely used surface vegetations,critical attention should be paid on B.dactyloides,C.breviculmis and L.spicata for fire prevention in winter and spring.
urban green spaceherbaceous plantburning characteristicscomprehensive evaluation
维普
万方数据
