摘要
碧痕营洼地中的湖相层是在末次冰期盛冰期之前的温暖期中发育的。时代为距今３万年到２万年前后，当时洼地附近的山地上生长着以落叶阔叶林为主的针阔混交林，小有波动。这一时段，年均气温较今低１－６℃。距今３万年到２．６万年前后，生长含高比例水青冈的针阔混交林，气温较今约低２－６℃；距今２．３万年前后，附近山地生长常绿阔叶、落叶混交林，气温较今约低１－３℃；在距今２．６万年到２．３万年和距今２．３万年以后一段时期，本地区发育针阔混交林；步入盛冰期的过程中，气候转向干冷，蕨类植物蔓生；湖相层之后是混杂泥砾堆积，气温降低幅度更大。
From 30ka.B.P. to 20 Ka.B.P.,in the warm period before the fullglacial,lacustrinedeposit was formed in the Bihenying basin , in Qinglong county south-west Guizhouprovince. Mixed deciduous broadleaf and coniferous forests were growing on the hilly land,with a small varying between deciduous broadleaf forest and mixed coniferous and deciduousbroadleaf forest. The annual mean tempretrure was 1-6℃ lower than that of today.From 30 Ka.B.P to 26 Ka.B.P.,there were mixed deciduous broadleaf and coniferoustrees with a high proportion of Fagus and a tempreture 2-6℃ lower,Around 23 Ka.B.P.,deciduous and evergreen trees were mixed up, and annual mean tempreture was 1-3℃ lo-wer than that of today.From 26 Ka.B.P. to 23 Ka.B.P.,and after 23 Ka.B.P,deciduousbroadleaf and comiferous three were mixed there. After that peiod climate turned to be dryand cold, pteridophyte grew widely. In the fullglacial period lacustrine deposition stopped,and was replaced by the chaotic sediments of muds and gravels.
出处
《地理研究》
CSSCI
CSCD
北大核心
1995年第2期49-55,共7页
Geographical Research
关键词
碧痕营
晚第四纪
古环境
孢粉
Bihenying,Late guaternary system,Paleoenvironment,Pollen and spore
