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火广泛地存在于自然界和人类社会中 ,并在现代生态系统的形成过程中扮演了重要角色。沉积物中的元素碳记录了大火发生的历史 ,对之进行定量分析可得到大火频率的长期记录 ,分析方法包括显微镜观察和化学氧化处理。化学方法通常是用 HCl- HF酸溶解碳酸盐及硅酸盐 ,再通过氧化反应去除有机物。几种沉积相中大火历史研究实例表明 ,大火改变了植被格局 ,进而影响区域气候 ;燃烧排放的气体和颗粒对大气化学性质也产生重大影响。
Fire exists extensively in nature and in human society and plays an important role in the formation of modern ecosystems. The elemental carbon in sediments records the history of large fires and provides a quantitative record of the long-term records of the fire’s frequency. Analytical methods include microscopic observation and chemical oxidation. The chemical method is usually HCl-HF acid dissolved carbonate and silicate, and then through the oxidation reaction to remove organic matter. Some fire history studies in the sedimentary facies show that the fire changed the vegetation pattern and further affected the regional climate. The gases and particles emitted by combustion also had a significant impact on the chemical properties of the atmosphere.