汉江上游晏家棚段二级阶地风成黄土成壤特征及气候变化  

Pedogenic Characteristics and Response to Climate Change of Yanjiapeng Profile on the Second River Terrace in Upper Reaches of Hanjiang River

作　　者：羊俊敏 周亚利 庞奖励 黄春长 崔颖颖 闫雪娇 Yang Junmin;Zhou Yali;Pang Jiangli;Huang Chunchang;Cui Yingying;Yan Xuejiao(School of Geography and Tourism,Shaanxi Normal University,Xi’an 710119,China)

机构地区：[1]陕西师范大学地理科学与旅游学院,陕西西安710119

出　　处：《山东农业科学》2020年第5期64-69,共6页Shandong Agricultural Sciences

基　　金：国家自然科学基金项目(41371209,41771110,41971116);中国博士后特别资助项目(2012T50795)。

摘　　要：为完善汉江上游更新世风成黄土成壤特征和气候变化资料,本研究以汉江上游晏家棚段二级阶地黄土-古土壤剖面为材料,进行粒度、磁化率和Rb/Sr的测定及对比分析。结果表明:晏家棚剖面自下而上呈现出更新世黄土(L2)-过渡性黄土(Lt)-古土壤(S1)的地层序列,剖面中古土壤(S1)的黏粒、磁化率(χlf)和Rb/Sr值均高于黄土层(Lt、L2),平均粒径(Mz)则低于黄土层,反映了古土壤(S1)风化成壤强度明显高于黄土层的特征。风化成壤特征的变化则进一步指示了古土壤形成时期受东亚夏季风影响,较温暖湿润;黄土形成时期,东亚冬季风增强,转为寒冷干旱的气候特点。In order to reveal the pedogenic characteristics of aeolian loess and climate change in the Pleistocene in upper reaches of the Hanjiang River,the loess-paleosol profile of Yanjiapeng in the upper reaches of Hanjiang River was used as the research object,and the measurement and analysis of particle size,magnetic susceptibility and Rb/Sr were developed.The Yanjiapeng section shows a stratigraphic sequence of Pleistocene loess(L2)-transition loess(Lt)-paleosol(S1)from bottom to top.The clay particle,magnetic susceptibility and Rb/Sr value of the paleosol in the profile are higher than those in the loess layer,but the average particle size(Mz)is the opposite.It is suggested that the weathering pedogenic intensity of S1 is significantly higher than that of Lt and L2.The weathering pedogenic intensity of YJP profile indicated the influence of climate change in the Pleistocene.The paleosol layer in the upper Hanjiang River was mainly affected by summer monsoon with a warm and humid climate,and during the period of loess accumulation,the East Asian winter monsoon was strengthened,so the climate turned cold and arid.

关 键 词：汉江上游 黄土 古土壤 成壤作用 气候变化 

分 类 号：S151.23[农业科学—土壤学]