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    大兴安岭反照率对森林火灾的响应变化分析

    Analysis of surface albedo responses to forest fires in the Great Xing’an Range, China

    • 摘要: 为了探究大兴安岭地表反照率对森林火灾的响应变化规律,以2003年“5·5”大兴安岭金河林业局森林火灾为例,基于全球陆表卫星数据集(Global Land Surface Satellite,GLASS)地表反照率与叶面积指数(leaf area index, LAI)数据对森林火灾发生后的地表反照率变化进行了分析。研究结果表明: ①森林火灾发生后火烧迹地地表反照率短期(1 a内)降低,而在中长期(10 a)呈现显著的升高趋势(0.001 2/a); ②这种中长期的地表反照率升高趋势受同期气候变化和人类活动影响较小,而与森林火灾发生后的植被恢复过程密切相关,并且过火区域地表反照率升高与LAI增加具有较强的相关性 (r = 0.682 (p < 0.01)); ③植被的积雪掩模效应进一步导致积雪覆盖期的火烧迹地地表反照率呈现更为显著的升高趋势。研究结果可以加深对地表反照率时空变化规律的认识,更为全面地评价森林火灾在全球气候变化中的影响作用奠定了基础。

       

      Abstract: To explore the surface albedo responses to forest fires in the Great Xing’an Range, China, this study investigated the forest fire occurring in the zone under the supervision of the Jinhe Forestry Bureau on May 5, 2003. The changes in the surface albedo after the forest fire were analyzed based on the global land surface satellite (GLASS)-derived surface albedo and leaf area index (LAI) data. The results indicate that the surface albedo in the burned zone decreased in the short term (1 a) but increased significantly at a rate of 0.001 2/a in the mid- to-long term (10 a). The increasing trend in the surface albedo was slightly influenced by contemporaneous climate changes and human activities but was closely associated with the vegetation restoration process after the forest fire. Moreover, the increase in the surface albedo in the burned zone was highly correlated with LAI increase (r=0.682, p<0.01). Additionally, the vegetation masking effect further enhanced the increasing trend in surface albedo in the burned zone during the snow-covered period. Overall, the results of this study deepen the understanding of spatiotemporal variations in the surface albedo, laying a foundation for thoroughly assessing the influence of forest fires on global climate changes.

       

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