大火历史及其与古气候关系研究

doi:10.11867/j.issn.1001-8166.2000.03.0328

地球科学进展 ›› 2000, Vol. 15 ›› Issue (3): 328 -334. doi: 10.11867/j.issn.1001-8166.2000.03.0328

大火历史及其与古气候关系研究

杨英,沈承德,易惟熙,孙彦敏

中国科学院广州地球化学研究所,广东广州 510640

收稿日期:1999-07-07 修回日期:1999-11-02 出版日期:2000-06-01
通讯作者: 杨英,女,1972年5月出生于四川渠县,在读博士生,主要从事同位素地球化学及古全球变化研究。
基金资助:
国家自然科学基金项目“干旱半干旱地区大火历史及其与古气候变化关系研究”(编号:49773186)、“中国东部陆地农业生态系统与全球变化相互作用机理研究”(编号:39899370)及“中国季风区古环境演变机制及其与全球变化的动力学联系”(编号:49894170)资助。

FIRE HISTORY AND ITS IMPACT ON PALEOCLIMATE CHANGE

YANG Ying,SHEN Chengde,YI Weixi,SUN Yanmin

Guangzhou Institute of Geochemistry,CAS,Guangzhou 510640,China

Received:1999-07-07 Revised:1999-11-02 Online:2000-06-01 Published:2000-06-01

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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。

关键词: 大火历史, 元素碳, 植被格局, 古气候变化

Fire is widespread in nature. It played a central role in moulding many modern ecosystems.Fire history can be reconstructed from such record as element carbon preserved in sediments, which can be quantified by microscope and chemical oxidation. Chemical techniques for the isolation of element carbon enerally involve the dissolution of carbonates and silicates by HCl-HF acid attack, followed by oxidation of contaminating organic matter to leave a residue composed of element carbon. Several studies of fire history in lake, ice core and marine sediments suggest that fire has exerted influences on vegetation patterns as well as regional climate, and the resulting gaseous and particulate emissions have affected the atmospheric chemistry.

Key words: Paleoclimatic change., Fire history, Element carbon, Vegetation pattern

中图分类号:

P597
P532

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