中国东北全新世干湿状况的演变
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P532 Q913.663.2

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国家攀登计划第27-1专题资助


Wetness Changes of the Holocene in Northeast China
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    摘要:

    通过综合分析植物花粉,沙土埋藏土壤,泥炭形成与发展,沙丘活动历史,黄土状土堆积和黑土发育等多种资料表明,我国东北地区的湿润程度或土壤水分含量在5ka BP以前的早中全新世较低,中晚全新世不能增加,早中全新世最干燥时段出现的^14C年代9-8ka BP,中晚全新世湿润时期可能是最近的2ka,近现代气候比过去10ka平均状况湿润。

    Abstract:

    It has long been held that, in Northeast China, just like in North China, the climatic change of the last ten thousands years is characterized by a warmer and wetter early-middle Holocene (8. 5-5 ka B P) and a cooler and drier late Holocene (3-0 ka B P). Through re-analysis of the multi-proxy data from Northeast China, the author puts forward a different view of reconstruction of the Holocene climate for the area. It suggests that the climate of the early-middle Holocene was relatively dry and has gradually become wetter since 8 ka B P. The last 2 ka may be the wettest period of the Holocene, and the the recent climate is on the average wether than in the past 10 ka. The driest period of the last ten thousand years may have occurred between 9 ka B P and 8 ka B P. This reconstruction is mainly based fossil pollen data. It is also strongly supported by the other lines of evidence from the buried soil, bog formation, loess deposition and black soil development and lake evolution. The causes of the wetness change are preliminarily discussed. The change in summer temperature induced by the earth orbital change may have played a role in the increase of wetness from 8 ka B P to present. The increase in precipitation after 6 ka B P, however, may have been of importance as well, and it may have something to do with the rise of sea level. The rise of sea level eventually led to the formation of the Bohai Sea and northwestern Yellow Sea, which, during the mid-summer period, provide significant amount of moisture for Northeast China at the present time.

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任国玉.1999.中国东北全新世干湿状况的演变[J].地质论评,45(3):255-264,[DOI].
Ren Guoyu.1999. Wetness Changes of the Holocene in Northeast China[J]. Geological Review,45(3):255-264.

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