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利用偏光显微镜对宁夏长城塬全新世黄土-古土壤序列(CCY)的微形态特征进行了详细观察和分析。结果表明,S0层的粗颗粒形态参数(如C/F(10μm)、面积、周长、等圆直径等)以及土壤形成物、孔隙、微垒结等微形态指标明显区别与黄土层L层,其中C/F(10μm)值在全剖面中达到最小值,孔隙度达到最大值,残积黏土铁染程度最强烈,指示出古土壤S0层受到的风化作用较为强烈,成壤强度较强。同时,微形态变化能够与磁化率、CaCO3、粒度含量变化进行良好的对比;通过对比得出C/F(10μm)值、孔隙度、土壤形成物存在形式也可作为指示气候变化的一个重要指标。
The microscopic morphological characteristics of the Holocene loess-paleosol sequence (CCY) of the Great Wall Platean in Ningxia were observed and analyzed in detail using polarization microscope. The results showed that the morphological parameters (such as C / F (10μm), area, circumference, iso-circle diameter and so on) of coarse grain and the micromorphological indicators such as soil formation, , In which the value of C / F (10μm) reached the minimum value in the full profile, the porosity reached the maximum value, and the degree of iron staining in residual clay was the strongest, indicating that the S0 layer of ancient soil was strongly weathered and strong in soil formation. At the same time, the micro-morphological changes can be compared with the changes of the magnetic susceptibility, CaCO3 and granularity. By comparing the values of C / F (10μm), porosity and the existence of soil formed matters, it can also be used as an important indicator of climate change .