Effects of management modes on combustibility of surface fuel of natural secondary forest in the Daxing’anling Mountains,Northeast China

doi:10.13466/j.cnki.lczyyj.2025.01.011

Abstract

Abstract:

Exploring the influence mechanism of different management modes on the combustibility of surface fuel can provide scientific basis for the sustainable management of natural secondary forest in the Daxing’anling Mountains.We studied the surface fuel(shrub,herb,litter,humus)of natural secondary coniferous-broadleaved mixed forest and broad-leaved forest under two management modes(comprehensive tending and non-interference)in the Daxing’anling Mountains,and analyzed the physicochemical properties and their interactions by drying method,ignition method,bomb method and linear regression.The results showed that:1)Under the two management modes,the water content of surface fuel of coniferous-broadleaved mixed forest and broad-leaved forest was shrub,herb,humus,litter from large to small,and the ignition point was humus,shrub,herb and litter in descending order.The water content and ignition point of different fuel components were higher in the comprehensive tending mode than in the non-interference mode,and the comprehensive tending mode increased the water content and ignition point of the surface fuel.2)The calorific value of surface fuel of coniferous-broadleaved mixed forest and broad-leaved forest under two management modes was litter,herb,shrub and humus in descending order.The calorific value of different fuel components was less in the comprehensive tending mode than in the non-interference mode,and the comprehensive tending mode reduced the calorific value of the surface fuel.3)Under the comprehensive tending mode,the ignition point of shrub and herb had a significant negative correlation with the calorific value(P<0.05),while the ignition point of litter and humus had no significant correlation with the calorific value(P>0.05).Under the non-interference mode,the ignition point of shrub and herb had no significant correlation with the calorific value(P>0.05),while the ignition point of litter and humus had a significant negative correlation with the calorific value(P<0.05).4)There was a significant positive correlation between ignition point and water content of different components of surface fuel under two management modes(P<0.05),and there was no significant correlation between calorific value and water content(P>0.05)(except herb in the non-interference mode).Compared with the non-interference mode,the comprehensive tending mode can improve the water content and ignition point of surface fuel,reduce the calorific value of surface fuel,and is conducive to reducing the combustibility of surface fuel and reducing the loss of forest resources.

Key words: management mode, natural secondary forest, surface fuel, water content, ignition point, calorific value

CLC Number:

S762

ZHANG Nianci, HAN Lidong, ZHANG Jing. Effects of management modes on combustibility of surface fuel of natural secondary forest in the Daxing’anling Mountains,Northeast China[J]. Forest and Grassland Resources Research, 2025, (1): 95-103.

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类别	指标	针阔混交林		阔叶林
类别	指标	综合抚育	无干扰	综合抚育	无干扰
样地概况	平均海拔/m	508.2	507	495	495
	平均坡度/(°)	5	5	5	5
	坡向	西	西	西	西
	郁闭度	0.72	0.81	0.75	0.82
经营措施	疏伐时间	2013年		2013年
	疏伐对象	胸径小于13 cm的林木		胸径小于13 cm的林木
	疏伐强度/%	15		12
	是否补植	否	否	否	否