Forest and Grassland Resources Research >
Characteristics of Understory Forest Fuels in Typical Plantations in Northern Guangdong Province
Received date: 2022-05-29
Revised date: 2022-07-04
Online published: 2022-10-13
Forest fuels,as the essential material for forest burning,constitute the main body of forest fire behavior.The physicochemical characteristics of forest fuels play an important role in forest fire prevention and fighting.The flammability indexes,including dry-to-fresh quality ratio,equilibrium moisture content,ignition point,calorific value,of shrubs (I),herbs (II),humus (III)and litter IV (d<0.6cm),V (0.6cm≤d<2.5cm)and VI (2.5cm≤d<7.62cm)were determined in five types of plantations (Eucalyptus robusta,Pinus massoniana,Cunninghamia lanceolata,Phyllostachys pubescens,Schima superba)in northern Guangdong Province.The flammability indexes of difference and relationship between different typical forests were analyzed to evaluate the flammability of five types of forest.The results showed that the dry-to-fresh quality ratio of forest fuels were from 41.88% to 85.99%,and the litter V had the highest dry-to-fresh quality ratio among all typical fuels.Moreover,there were significant differences between different typical forest fuels (P<0.01).The content of equilibrium moisture of humus (III)and litter IV,V and VI in five typical forests were 4.77%~5.01%,6.86%~7.27%,8.26%~9.64%,9.94%~10.58%,respectively.The content of equilibrium moisture of litter increased with the increase of diameter,and the content of equilibrium moisture of litter VI was significantly higher than III (P<0.01).The range of ignition points of humus and litter were 264.67~271.00℃ and 248.00~255.17℃,respectively.Moreover,the range of calorific values were 8.47~11.50kJ/g and 16.11~17.92kJ/g,respectively.And the ignition point of humus was significantly higher than litter (P<0.01).Conversely,the calorific value of litter was higher than humus.Person correlation analysis showed that there had a positive commonality between the dry-to-fresh quality ratios of all fuels.Namely,the dry-to-fresh quality ratios were positively correlated between different typical forests.The impact of the equilibrium moisture on the ignition point was greater than dry-to-fresh quality ratio.The fire resistance strength of five plantations was divided into 3 categories,the first group was Schima superba forest with strong fire resistance.The Phyllostachys pubescens forest with medium fire resistance was followed.The third group,including Eucalyptus robusta forest,Pinus massoniana forest and Cunninghamia lanceolate forest,were relatively flammable forests.
Zhigao FU , Zhilong WANG , Yihua XIAO , Han XU , Xin SHI . Characteristics of Understory Forest Fuels in Typical Plantations in Northern Guangdong Province[J]. Forest and Grassland Resources Research, 2022 , 0(4) : 61 -71 . DOI: 10.13466/j.cnki.lyzygl.2022.04.009
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