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《Journal of Beijing Forestry University》 2013-03
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Carbon distribution and combustibility of fuels in Larix olgensis plantations.

LIU Yan-hong; MA Wei. Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forestry University, 100083, P. R.China.  
In order to study the interaction between fuel carbon storage (CS) distribution and combustibility of plantation ecosystem at different stages in depth, and evaluate forest fire risk grade comprehensively, the carbon storages and distribution of Larix olgensis plantations at five different stages from 7 to 48 years old were compared in representative region of Lesser Khingan Mountains (Northeast of China). First, fuels were divided into five subtle layers according to their virtual structure. Then, fuel carbon storage of each layer was estimated by DBH, height, crown area, depth, etc., via corresponding carbon density. Finally, the fire classes, fire behavior, and fire risk of each layer at different stages were analyzed, and evaluated the forest combustibility based on the total fuel carbon. The results showed that: 1) Surface fire of immature forest can be ignited easily because of abundant herbs, and high-intensity crown fire could occur, but its spread rate was low because of less CS as 87.660 t/hm2; 2) Once crown fire occur in juvenile forest (with 138.574 t/hm2 CS), high density and certain dead branches would result in high-intensity crown fire; 3) Because of tending and thinning, middle-aged stand with 163.884 t/hm2 CS had lower probability of surface or crown fire, but it can initiate crown fire with high spread rate once fire was ignited; 4) In near-mature stand (with 199.838 t/hm2 CS), crown fire initiation only occurs under extreme conditions, but can be on moderate-intensity surface fire with more possibility. 5) A mass of fuel as high as 253.962 t/hm2 CS could result in high-intensity surface fire in mature stand without effective reduction treatments to floor fuel.
【Fund】: 国家自然科学基金项目(30940014);; “948”国家林业局引进项目(2008-4-48)
【CateGory Index】: S791.22;S762
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