The Main Herbs In Combustion Research In Hei Longjiang Province

Physical and chemical properties such as contents of lignin, ash, extractive and heat, moisture content, combustion rate, and some ecological features of48herbaceous species in Heilongjiang Province were investigated. The flammability of the species were evaluated by analyzing these data using analyses such as ANOVA, correlation, PCA and clustering. Followings are concluded:1. Combustion heat varies greatly among the48species. The mean moisture content of the species is465.3%.Aruncus sylvester Kostel has the lowest moisture content and Flos seu Radix Impatientis nolitanger is the highest. Their mean ash content is10.13%. Polygonum manshuriense has the lowest and Chenopodium album the highest. The mean combustion rate is17.28cm2/s. Chenopodium album has the highest and Flos seu Radix Impatientis nolitangeris the lowest. The mean carbonate time is5.98s with Geum aleppicum as the longest one and Chelidonium majus the shortest one. The mean heat content of the48species is10513.27J/g, and Lepidium apetalum has the highest one and Chenopodium album the lowest The mean content of benzene-ethanol extractives is5.17%with Flos seu Radix Impatientis nolitangeris having the highest value and Polygonum manshuriense. the lowest.2. Moisture content is the major factor determining the combustibility of the herbaceous fuels. Heat release is directly affected by content of ash, extractives and lignin. Heat content is negatively correlated with ash content and positively correlated with contents of extractives and lignin. The latter relationship is much closer than the former one.3. A combustibility evaluation model was established for the48herbaceous species with the weight of each variable determined by a analytic hierarchy process. Carex tristachya is the easiest for ignition and Flos seu Radix Impatientis nolitangeris the most difficult.Geranium sibiricum L. is the lowest in combustion intensity and Flos seu Radix Impatientis nolitanger is the highest. Polygonum manshuriense V. Petr. ex Kom. has the shortest combustion duration and Flos seu Radix Impatientis nolitanger is the longest。 Assessed comprehensively, Flos seu Radix Impatientis nolitangeris has the lowest combustibility while Carex tristachya has the highes.A clustering analysis using ignitability, combustion intensity, combustion duration and combustibility shows that the48species can be grouped into three categories. Athyriummul tidentatum as highly-ignitable, Veratrum nigrum L. as moderately ignitable and Flos seu Radix Impatientis nolitangeris as least-ignitable. Dryopteris crassirhizoma Nakai is the highest in combustion intensity, Athyriummultidentatum moderate and Polygonum thunbergii Sieb. et Zucc. the lowest. Chenopodium albumL.has the longest burning duration and Cardamine leucantha (Tausch) O. E. Schulz the lowest。The research in this paper can provide data for improvement of plant in fire biobelts. The study on combustibility of herbaceous fuels can be used as effective measurement for forest fire control and use and promote the integrity and systematicness of research on herbaceous fuels.