浙江天台-宁海晚中新世孢粉组合及其古植被和古气候

被引:7
作者
杨毅 [1 ]
金培红 [1 ]
董重 [1 ]
徐小慧 [1 ]
李瑞云 [1 ]
马福军 [1 ]
王秋军 [1 ]
苗运法 [2 ]
孙柏年 [1 ]
机构
[1] 兰州大学地质科学与矿产资源学院
[2] 中国科学院寒区旱区环境与工程研究所沙漠与沙漠化重点实验室
基金
高等学校博士学科点专项科研基金;
关键词
D O I
暂无
中图分类号
Q914 [古植物学]; P532 [古气候学];
学科分类号
0709 ; 070903 ;
摘要
分析了浙江天台-宁海地区嵊县组第3沉积层的孢粉样品11个,该层时代属晚中新世。其中,在宁海县黄泥塘村和大路下村各采集4个,天台县家湖村采集3个;样品岩性主要为浅灰色至灰褐色湖相沉积的泥岩至泥质粉砂岩,部分样品含较多硅藻土(采样地点分布范围29°8′29°10′N,121°14′121°16′E)。经化学处理,除HNT-11,DLX-1和DLX-2以外,在其余8个样品中发现了丰富且保存完好的孢粉化石,共鉴定39个类群,归属23科,建立了以栎属(Quercus)—松属(Pinus)—禾本科(Poaceae)一菱属(Trapa)为主要特征的孢粉组合。结合同层位植物大化石记录,推论晚中新世天台-宁海及其周边地区的植被类型丰富,以具有一定垂直地带性的森林植被为主:自山麓向上,随海拔升高,由常绿阔叶林逐渐向常绿、落叶阔叶混交林以及落叶阔叶林过渡;研究区生长有松属(Pinus)及竹类植物,草本植物生长茂盛,并生长有一定量的蕨类植物;研究区内湖泊、池塘及沼泽等平静的淡水水体普遍存在,使得菱属等水生草本及盘星藻(Pediastrum)等淡水藻类广泛生长。该植被类型与现今浙江兼具一定垂直地带性的典型中亚热带常绿阔叶林较为相似。通过对当前孢粉组合应用共存分析法,定量重建了晚中新世研究区的8个古气候参数,即年平均气温(MAT)17.0~18.5℃,年平均降水量(MAP)979.0~1722.0mm,最热月平均气温(WMT)26.5~28.4℃,最冷月平均气温(CMT)3.3~7.7℃,平均最大月降水量(MMaP)176.2~265.0mm,平均最小月降水量(MMiP)7.0~31.6mm,平均最热月降水量(MWP)165.5~232.5mm以及气温年较差(DT)18.2~21.5℃,表明晚中新世研究区的气候温暖湿润,同该区现代气候相近。
引用
收藏
页码:669 / 682
页数:14
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