CLIMATE TRANSFER FUNCTION FROM OPAL PHYTOLITH AND ITS APPLICATION IN PALEOCLIMATE RECONSTRUCTION OF CHINA LOESSPALEOSOL SEQUENCE
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摘要: 利用全国１６２块表层土壤样品的植物硅酸体组合及气候资料，建立植物硅酸体－气候因子(温度、降水量)转换函数，通过转换函数估算了渭南黄土剖面７１块样品(约３万年来)的年均温、年均降水量。在全新统部分样品中发现了少量的竹亚科植物硅酸体。古气候从末次冰消期向全新世的演变过程中，出现了两次比较明显的气候波动，分别与波令间冰阶、中仙女木冰阶、阿勒罗德间冰阶和新仙女木冰阶相对应。本文首次发现黄土高原末次冰消期气候转暖起始于１４０００ａＢ．Ｐ．。Abstract: There are mainly three kinds of approaches at present day using organism fossils to reconstruct paleoenvironmental and paleoclimatic changes: 1) indicative species, 2) climatic transfer function, 3) response surface. Among them, the climatictransfer function has been widely used in various fossil organisms such as foraminifera, radioraria, diatom, spore pollen and land snail etc. In this paper, opal phytolith-climatic factor transfer function has been established and introduced in considering the following factors: a variety of modern surface soil samples may not distribute in the same climatic zone or the same ecological conditions; species distributedin different climatic or ecological condition may be controlled by different factors;the relationship between organism assemblage and climatic parameter is not the simplelinear ones; how to ensure the reality of ecological factor of fossil assemblage tocorrespond to the modern ecological factor in the construction of climatic transferfunction; how to eliminate the effects of manmade and microecological environment.
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