【摘要】 小黑土剖面是黔中高原岩溶化盆地剖面,深390cm,未达基岩.采样71块,获孢粉17769粒,有71个科属,以本本花粉为主,其次为草本花粉,蕨类孢子较少.自下而上划分为二个孢粉组合带.反映出古植被变化为落叶阔叶树为主的常绿、落叶针阔叶混交林,附近山地有松林及云杉林一常绿、落叶针阔叶混交林及喜冷湿的莎草较多.古气候变化由温凉一温暧偏凉湿.其地质时代,经¹⁴C测定,孔深390cm处为24500±1800a.B.P.;深310cm处为21260a.B.P.,属晚更新世.更多还原

【Abstract】 : Xiaoheitu section is a plateau karst basin one in the middle of Guizhdu, which is 390cm deep and doesn’t reach the basic rock. Through sporopollen analysis, 17769 sporopollcn grains have been gained from 71 samples collected, of which there are 71 families and genera, and most of them are woody pollens, next are herb pollens, then pteridophyta pollens. This section can be divided into two sporopollen association belts from the lower to the upper, and showed that the changes of palaeovegetation are formed by forests mixed mainly with deciduous broadleaf trees and evergreen deciduous conifer broadleaf trees, which there are Pinus and Dicea forests-evergreen deciduous conifer broadleaf forests mixed as well as a lot of cyperaceae. The changes of palaeoclimate are from warm-cool - warm to cool moist. Through 14C determination, at the depth of 390cm and 310cm, their geological age are 24500 1800a.B.P.and 21260a.B.P, respectively, belonging to Epileistoccne.更多还原