【摘要】 长白山岳桦林带赤池泥炭沼泽堆积开始于3400aBP.前后,其周围植被有过针叶林和岳桦林的交替过程.长白山地区于3400a B .P.前气温已开始下降;3400～2200a B.P.为相对温暖时期;2200a B.P.之后气温下降加快;1800a B P.以后气温冷暖交替变化.更多还原

【Abstract】 Pollen analysis and 14C dating of Chichi peat marsh in Betula ermanii forest, the Changbai Mountains show that the peat deposit of the marsh probably accumulated after 3400aB. P. There might be vegetation succesion between dark coniferous forest and Be-tula ermanii forest there since then. The palaeoclimate estimated from major factor anal-ysis of pollen data reveals that the climate had begun to descent before 3400aB. P. It was a relative warm period between 3400-2200aB. P. Then the climate declined rapidly and reached the lowest level in 1800aB. P. Later,it changed alternatively in warm and cool. The comparatively warm periods were respectively 1200,800 and 200aB. P. ,and relative cool periods 1000 and 400aB. P.更多还原