摘要
通过对渭河中游全新世南寺村(NSC)剖面的地层、磁化率、粒度、pH值、碳酸钙含量以及部分元素的测定分析,发现:马兰黄土层L1的磁化率和黏粒含量在全剖面中最低,古土壤层S0最高,过渡层Lt和现代黄土层L0介于两者之间;pH值、碳酸钙含量以及部分元素参数与磁化率都有很好的对应关系,这表明在全新世早期关中地区气候温和干燥,降雨量稀少,成壤作用较弱;进入全新世大暖期阶段,气候变得温暖湿润,降雨量增多,黄土堆积速率减小,化学风化作用增强,成壤作用显著;全新世晚期,气候开始恶化,向干旱化方向发展,成壤作用减弱,风尘堆积作用增强.
Through the analysis about soil layer, magnetic susceptibility, particle size, pH value,calcium carbonate content and some chemical element determination of Holocene NSC profile in the middle reaches of the Weihe River, it was found that the magnetic susceptibility and clay content of Malan loess layer L1 are the lowest in the whole section,and are the highest in paleosol So. And they are moderate in transition layer Lt and modern soil layer L0. pH value, calcium carbonate content and some element parameters have a good relationship with magnetic susceptibility,and it suggested that in the early of Holocene,the climate was mild and dry, the rainfall was little,and the biochemical weathering was weak. Entering the Holocene warm period, the climate became warm and humid, the rainfall increased, Loess accumulation rate decreased, the chemical weathering enhanced and pedogenesis was distinct. In the late of Holocene, climate became deteriorating and drying, pedogenesis was abated and dust accumulation was enhanced.
出处
《陕西师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第2期93-97,共5页
Journal of Shaanxi Normal University：Natural Science Edition
基金
国家自然科学基金重点资助项目(41030637)
中央高校基本科研业务费专项资金项目(GK20901007)
关键词
全新世
渭河
黄土-古土壤
序列特征
Holocene
Weihe River
loess-paleosol, sequence characteristics
