华中师范大学学报（自然科学版）2017，Vol.51Issue(5)：680-689,10.DOI:10.19603/j.cnki.1000-1190.2017.05.020
鄂西七姊妹山泥炭藓湿地沉积物粒度特征及其环境意义探讨
Grain-size characteristics and environmental significance of Sphagnum Mire at Qizimei Mountains in Western Hubei Province
摘要
Abstract
Taking the QZMS core sediments of Sphagnum wetlands at Qizimei Mountains in Western Hubei Province as the research object,the climate change of southwest mountainous region of Hubei since 13 000 cal.a BP is discussed through the comprehensive analysis of AMS14C dating,lithologic characteristics and grain-size of the sediments.The research has shown that the grain composition of QZMS core sediments are mainly composed of fine silt and silt.The frequency distribution curves are unimodal,and from bottom to top,the kurtosis is from wide to narrow with the skewness from nearly symmetric to positive-skewed,which reflected the evolution of handing dynamics and sedimentary environment.The synthetical analysis results indicate that the evolution of sedimentary environment in the study area can be divided into four stages:1) 12.9～11.6 cal.ka BP,the climate had a high frequency of wave but low amplitude,and the hydrodynamic condition was relatively weak.2) 11.6～ 10.2 cal.ka BP,the transition stage of late Pleistocene to Holocene,the hydrodynamic condition stayed weak and the environment was stable.3) 10.2～7.7 cal.ka BP,compared with the previous stage,the temperature was gradually increased,and the hydrodynamic condition became stronger,the climate was becoming warm and wet.4) 7.7～2.0 cal.ka BP,the climate was warm and wet as well as relatively stable.The hydrodynamic condition became the strongest with low fluctuation frequency while high amplitude of the kurtosis and skewness.The result means that the grain-size of Sphagnum wetlands at Qizimei Mountains was closely related to the hydrodynamic condition and the change of the source.By virtue of the grain-size composition and parameters distribution characteristics,the evolution of sedimentary environment is able to be rebuilt,revealing the developmental process of the Sphagnum wetlands and providing scientific reference for study on the protection of wetlands and climate change in this region.关键词
鄂西/泥炭藓湿地/粒度/沉积环境/古环境意义Key words
western Hubei Province/sphagnum wetlands/grain-size/sedimentary environment/paleo-environment significance分类
天文与地球科学引用本文复制引用
李泽,刘韬,李亭亭,汪正祥,雷耘,彭宗林..鄂西七姊妹山泥炭藓湿地沉积物粒度特征及其环境意义探讨[J].华中师范大学学报（自然科学版）,2017,51(5):680-689,10.基金项目
国家自然科学基金项目(41471041) （41471041）
湖北省自然科学基金项目(2015CFB704) （2015CFB704）
区域开发与环境响应湖北省重点实验室开放基金项目(2015(C)004). （2015(C）
