摘要
以时间尺度 2 0万年以来的洛川黄土剖面为研究对象。采用间隔 30～ 5 0cm的密集采样 ,通过土样的物理、化学、矿物组成和孢粉分析及土壤微形态镜鉴的综合研究 ,对第四纪生物气候环境演变提出了新的见解。对原以代表干冷环境沉积为主的黄土地层 (L) ,揭示了内伏半干旱环境的演化及相应的土壤发育过程 ;对原以代表暖湿环境的红褐色古土壤层 ,揭示了内伏干旱、半干旱环境的演化及干旱与湿润型孢粉共存的矛盾实质。研究证示 :深厚的黄土剖面是在第四纪生物—气候环境演变过程中 ,通过黄土沉积、成壤强弱交替演化 ,形成发育的由不同土壤类型组成的特殊的多元古土壤剖面体系。
Summary New Viewpoints on bio climatic environmental evolution in Quaternary were proposed based on analysis of physical,chemical,mineralogical composition,spore pollen and micro morphology studies on soil samples taken at 30～50 cmintervals from Luochuan loess profile dating back to 200,000 BC The Loess layer(L),formerly interpreted as deposition in arid and cold climate,revealed semi arid environmental evolution and corresponding soil formation The red brown paleosol layer(S),formerly represented warm and humid environment essentially revealed interior arid and semi arid environmental evolution as shown by contrasting coexistence of both arid and humid type of spore pollen. The present study confirmed that thick Luochuan loess profile is a special multi paleosol profile system eomprising different soil types and formed by alteration of loess deposition and soil formation in the course of bio climatic environmental evolution in Quaternary.
出处
《土壤学报》
CAS
CSCD
北大核心
2002年第5期609-617,共9页
Acta Pedologica Sinica
基金
国家自然科学基金项目资助 (编号 494740 3 9和 1 983 2 0 60 )
