汉江上游谷地黄褐土粒度组成特征及其意义  

The grain construction of the yellow cinnamon soil and its significance in the upper reaches of Hanjiang valley

作　　者：王朝建[1] 庞奖励[1] 黄春长[1] 查小春[1] 周亚利[1] 

机构地区：[1]陕西师范大学旅游与环境学院陕西西安710062

出　　处：《陕西师范大学学报（自然科学版）》2012年第3期76-80,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);教育部博士点基金优先发展领域项目(20110202130002);中央高校基本科研业务费专项资金项目(GK200901007,GK200902020)

摘　　要：对汉江上游谷地河流一级阶地上黄褐土的粒度组成进行了分析.结果显示:剖面下部黄土的粒度参数数值(σ=1.72,Kg=1.03,S=1.15)和粒度分布曲线与古土壤的参数(σ=1.73,Kg=1.03,S=1.15)和曲线一致,而与区内典型洪水滞流沉积物洪水SWD(σ=1.9,Kg=1.10,S=1.20)不同;在粒度成分三角图中,黄土和古土壤集中落在小的区域内,而洪水SWD呈分散分布;黄土的Y值均小于—2.741 1,而洪水SWD大多数样品Y值大于—2.741 1.这证明汉江上游谷地古土壤S0继承了黄土的基本特征,两者具有风成堆积物的特性.与渭河谷地典型黄土对比,汉江上游谷地的黄土粒度与其十分相似,说明二者具有同源性.The grain-size construction of the ＂loess-like material＂ of the fist terrace, upper reaches of Hanjiang valley was analyzed. The results reveal that the grain parameters（a= 1. 72, Kg = 1.03,S= 1.15） and the frequency curve of the loess are similar to paleosol（a=1. 73,Kg=l. 03,S = 1.15）, but different with the flood SWD（a= 1.9, Kg= 1.10, S= 1.20）. In the triangle, the loess and the paleosol concentrate in a small area, but the flood SWD is discrete distribution. Y values of the loess are smaller than --2. 741 1, and the flood SWD are above -2. 741 1. These certify that the paleosol inherit the basic feature of the loess, both are eolian. Contrasted with the loess of Weihe valley, quite similar, that indicate the homology.

关 键 词：汉江黄土 风成黄土 粒度 

分 类 号：P736.21[天文地球—海洋地质] S152.3[天文地球—海洋科学]