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关于周原全新世土壤剖面木炭屑与野火活动的关系研究
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【小学地理电教论文】作者：谭志海 黄春长 庞奖励 李平华论文关键词： 野火 生态演替 全新世 关中盆地 木炭屑论文摘要： 研究陕西周原全新世黄土剖面磁化率曲线、总有机碳曲线、木炭屑曲线和野火活动及其与生态环境演变 的关系结果表明,马兰黄土堆积时期气候干旱,在当时半荒漠草原上当地时常有自然野火发生;全新世大暖时期(8500~3100aB.P)气候湿润,生物成壤作用强度大,呈现森林或森林草原自然景观,野火活动极少发生;先周人迁居到周原地区(3100aB.P)开始,人类用火及其放火烧荒开垦农田等活动,加之气候变得干旱,生物化学成壤作用减弱,致使生态环境发生重大变化,自然生态景观向半自然、半人工景观演替;1500aB.P开始可耕种土地几乎开垦殆尽,生态景观完全被人工农田生态景观所代替;而近几百年来随着人口密度和聚落的增加,人类生活用火和垃圾随之加大,人类对土壤环境的干扰进一步增强。
Key words： Wildfire,Change of ecology,Holocene,Guanzhong Basin,Charcoal
Abstract：The relationships among soil charcoal in Holocene,wildfire and its change of ecological environment were studied.The results show that in the phase of piling of Malan loess,the climate was arid and wildfire often occurred onsemi-desert grassland.During the period of soil formation,bio-pedogenic processes were so active that forests or forest-grassland formed with the arrival of humid warmer climate of the
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