地理科学 ›› 1995, Vol. 15 ›› Issue (1): 30-38,99.doi: 10.13249/j.cnki.sgs.1995.01.30

• 论文 • 上一篇    下一篇

从泥炭分布的演化过程分析中国东部和日本一万年来的干湿变迁

白光润   

  1. 东北师范大学地理系, 长春130024
  • 收稿日期:1994-06-01 出版日期:1995-01-20 发布日期:1995-01-20

HUMID AND ARID FLUCTUATION DURING THE LAST 10000 YEARS RECONSTRUCTED FROM THE PEATFORMATION IN EASTERN CHINA AND JAPAN

Bai Guangrun   

  1. Department of Geography, Northeast Normal University, Changchun 130024
  • Received:1994-06-01 Online:1995-01-20 Published:1995-01-20

摘要: 根据泥炭形成水热系统指数(Z=5.7K+12-T)、埋藏泥炭层14C年代测定及利用孢粉等手段推测的古温度变迁研究成果,定量地推测出以湿润系数(K)和降水量(P)所表示的中国东部和日本一万年来干湿变迁的大势及其区域差异.

Abstract: Peat formation is considered to be controlled by both water and heat conditions in this paper.A comparison made by the author between present peat distribution and the climatic record of 841 stations in the world during the years of 1961-1970 provides the climatic condition of peat formation.It is well explained by the following equation:Z=5.7K+12-T T(mean air temperature of days with >10℃) respresentes the thermal condition of those days, it can be evaluated from palynological information.Z(water-heat index of peat formation) can be acquired by 14C dating of peat deposits.Therefore,K(ratio of precipitation to evapotranspiration) can be obtained from T and Z.The humid and arid fluctuation curves are figured at Kyoto,Tokyo and Sapporo in Japan, and Beijing, Changchun and Zhenjiang in the eastern part of China.The humid and arid fluctuation of East Asia in the last 10000 years on peat foma-tion are summarized as follows:1)ca.10000-8500 a.B.P.Arid climate is prevalent especially in the northern part of Esat Asia.2)ca.6000-5000 a.B.P.Humid climate accompanied by the warm period“Hyp-sithermal”is generally predominant.The beginning of humid climate is, however, delayed ca.2000 years and the humid period are not coincide with the warm period in the northern part of East Asia.3)After ca.3000 a.B.P.Increased aridity are recognized in the eastern part of China.