新疆天山东部森林地表可燃物的热值研究

doi:10.13866/j.azr.2023.10.13

Abstract

Abstract:

Forest surface combustibles are one of the important factors in forest fire propagation, and their calorific values are an important index by which to assess combustibility. This study has aimed to assess the surface fuels available in four typical vegetation types in the eastern Tianshan Mountains of Xinjiang, China. The characteristics of the surface fuel calorific values and relationship with ignition point and absolute moisture content were analyzed. The results show that in coniferous and broad-leaved forests, there were significant differences between herb and litter components, while in shrub forest, there were significant differences between shrub and litter components. Within the same forest the calorific values were litter > herb > shrub > humus. The calorific values in the coniferous forests were the highest among the herbaceous fuel components (19.38 ± 0.08 kJ·g^-1), while those in the coniferous forests were highest among the litter fuel components (19.55 ± 0.05 kJ·g^-1). Differences were identified in the relationship between the calorific value and the ignition point of the surface combustibles for the different components. There was a significant correlation between the burning point of the shrub fuel components and the calorific value (R² = 0.81, P < 0.01), and between the burning point of litter fuel components and the calorific value (R² = 0.38, P < 0.05). However, there was no significant correlation between the burning point and calorific value of the herbs and humus (P > 0.05). In addition, there was no significant correlation between the calorific values of the surface fuel and the absolute moisture content of all forest types. Forest type, tree species, physical and chemical properties, and other conditions were thus found to have a comprehensive effect on the calorific values of the different fuels. The results of this study provide a theoretical basis for forest fire management in the eastern Tianshan Mountains as they will help to accurately predict the calorific energy and potential forest fire risks and provide data support for in-depth research on regional surface fuels.

Key words: forest, calorific value, surface combustibles, ignition point, absolute water content, eastern Tianshan Mountains

ZHOU Xiang, WANG Peng, Bumaliyamu MAIMAITI, WANG Qiuyan, YUE Jian. Calorific values of forest surface fuels in the eastern Tianshan Mountains of Xinjiang, China[J].Arid Zone Research, 2023, 40(10): 1670-1677.

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可燃物组分	林型
可燃物组分	针叶林	阔叶林	针阔混交林	灌木林
灌木	18.59±0.10a	18.19±0.13ab	18.67±0.05b	18.99±0.03ab
草本	19.38±0.08a	19.05±0.08ab	17.83±0.04ab	19.36±0.06b
凋落物	19.55±0.05ac	19.01±0.04ab	19.50±0.08bd	19.04±0.09cd
腐殖质	11.66±0.02a	12.23±0.11a	13.37±0.23a	15.76±0.10a

Calorific values of forest surface fuels in the eastern Tianshan Mountains of Xinjiang, China

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