摘要
利用燕山地区几个主要植物的花粉-气候响应面模型,定量恢复了燕山南部5000aB.P.来的气候变化。5000aB.P.以来,燕山南部的气候曾发生过两次明显的降温事件,一次发生在4500～3600aB.P.,7月份平均气温比今低2.0℃左右;一次发生在2750～1750aB.P.,7月份平均气温比今低3.7℃左右;2000aB.P.以来年均降水量一直呈下降趋势,年均降水量比2000aB.P.前减少50～100mm。孢粉分析表明,燕山南部人工栽培板栗的历史可以追索到1600aB.P.,种植水稻的历史可以追索到700aB.P.。
Climatic changes of Yanshan Mountain area since 5000 a B. P. had been reconstruted using several major pollen-climate response surface models. Two serious climate decline events took place during the past 5000 years. One was in the period of (4500-3600) a B. P. with mean July temperature 2.0℃ lower than that at present. Another was in the period of (2750-1750) a B. P. with mean July temperature 3.7℃ lower than that at present. Since 2000 a B. P., the mean annual precipitation reduced gradually. The present mean annual precipitation is about (50-100)mm lower than that 2000 a ago. Pollen analysis shows that Castanea trees had been cultivated about 1600 years, and Oryza had been planted for 700 years in the southern part of Yanshan Mountain.
出处
《地理科学》
CSCD
北大核心
2004年第3期339-345,共7页
Scientia Geographica Sinica
基金
国家科技部重大基础研究专项(2003CCA01800)
国家自然科学基金(40171095)
河北省自然科学基金(402615)联合资助项目。
关键词
孢粉分析
花粉-气候响应面
气候变化
pollen analysis
pollen-climate response surface
climatic change
