【摘要】 选取哈尼湖钻孔360~0 cm(5 112 aBP以来)的沉积物进行孢粉分析,共采取样品85个,平均时间分辨率约为60 a。样品中花粉含量非常丰富,种类以乔木为主,其百分含量多在80%以上,最高可达96%,根据花粉组成在钻孔上的变化,结合花粉沉积率进行样品分析,自下而上可分为4个花粉组合带,进而将该区5 000 a以来气候演化大致分为4个阶段:阶段1(5 112~3 784 aBP),阔叶类乔木占优势,湿生及水生草本比较丰富,气候温暖湿润;阶段2(3 784~1 380 aBP),针叶类乔木占优势,湿生及水生草本消失,气候变凉干;阶段3(1 380~994 aBP),以松为主的针叶类仍占绝对优势,喜温湿的灌木草本含量持续下降,说明气候继续变冷变干;阶段4(994 aBP以来),植物种类比较丰富,湿生植物的沉积率明显增高,气候变得更加湿润。更多还原

【Abstract】 According to the spore pollen analysis results of 85 core samples from Ha’ni Lake,the history of vegetation and environment can be divided into four stages as follows: ① StageⅠ(5 112~3 784 aBP): Broadleaved trees dominated in this stage,and the climate was warm and wet;② Stage Ⅱ(3 784~1 380 aBP):The coniferous trees dominated during the whole stage,hydrophytic herbaceous plants disappeared,and the climate changed to be cold and dry;③ Stage Ⅲ(1 380~994 aBP):The percent of coniferous trees continued to increase but hydrophytic herbaceous plants began to appear,suggesting that the climate was colder but a little more humid;④Stage Ⅳ(994~0 aBP): The diversity of plants was great,and the pollen sedimentation rate of hydrophytic herbaceous plants obviously increased,so the climate changed to be more humid.更多还原