密山杨木3000多年来气候变化的泥炭记录

通过典型泥炭剖面孢粉分析,划出5个孢粉带。植被与气候变化过程:3400 a B.P.以前,喜温阔叶树占优势,为温暖偏干气候;3400～1940 a B.P.以松(Pinus)、云杉(Picea)、冷杉(Abies)为主的针阔叶混交林夹湿草甸,气候凉湿;1940～1090 a B.P.为针阔叶混交林,为温干气候;1090～545 a B.P.为阔叶占优势针阔叶混交林,为温湿气候;545 a B.P.至近代沼泽化草甸占优势,气候向冷干方向发展。通过孢粉、磁化率、有机质及考古与史籍记载互相印证,该剖面深143～125cm上部为公元初冷期;南北朝至隋唐时期气候,分别位于125～85cm和85～38cm深度。自3400 a B.P.以来,密山一带古代人类活动频繁,该区域隋唐时期文化遗址数量增加,在温暖气候环境下古代人类对林木获取量增加。

Peat record of climate change sincce 3000 years in Yangmu, Mishan region

Peatland of Yangmu in Mishan region is located at 45°34′N,132°23′E. 5 spore pollen zones are divided throngh the spore pollen analysis. The change process of paleovegetation and paleoclimate was obtained. Warm-inclined broad-leaved forest predom inated in the environment of warm climate with a little dry climate before 3400 a B.P..Deciduous broad-leaved and conferous mixed forestpredominated,in which Pinus, Picea and Abies were main speries,together with wet meadow in the environiment of the cool and wet climate during 3400～1940 a B.P..Deciduous broad-leaved and coniferous mixed forest predominated in the environmentof dry and warm climate from 1940 to 1090 a B.P..Broad-leaved forest was predominant,and the climate was the warm and wet from 1090～545 a B.P..Bog m eadow predominated when the climate changed to cool and dry from 545 a B.P.. The compostion of the upper part of the 143～125 cm peat profile presented the cold period in the early of Christian era through the mutual identification between the records of historical material such as spore pollen,magnetization rate,organic matter,and archaeology study.The composition of the parts of 125～85 cm and 85～38cm presented the warm climate in Nan Bei Dynasty and Sui-Tang Dynasty.Since 3400 a B.P.for the reason of frequent human activites in Mishan region,the amunt of cultural relics in Sui-Tang Dynasty increased,which represented thatancient man took much more woods from the forest,while it was in an environment of warm climate.