【摘要】 将研究剖面自上而下以2cm间隔采取的样品,烘干并研磨至小于45μm,此时,土壤的颜色将不再发生变化。将处理好的样品分别测土壤颜色指标亮度、红度和黄度,将测得的亮度、红度和黄度指标分MIS4、MIS3、MIS2和MIS14个阶段,通过与研究剖面的气候指标磁化率、粒度和CaCO₃在百年尺度、千年尺度上的对比分析,以及在万年尺度上与高纬格陵兰GRIP冰芯记录和反映全球冰量变化的SPECMAP曲线进行对比分析表明：土壤颜色指标作为气候变化的代用指标无论在百年尺度、千年尺度还是在万年尺度上均是可靠的,这种可靠性在末次冰期阶段表现得更为显著,这一结论是否适用于整个第四纪冰期间冰期旋回,尚需更多黄土剖面的研究事实来加以证明。更多还原

【Abstract】 After the samples from the Yuanbao Loess section in Linxia dried and grinded with 2 cm interval from top to bottom to smaller 45μm,the soil color is invariable at this stage.Measuring the soil color index of light- ness,redness and yellowness respectively and comparing with the magnetic susceptibility,grainsize,CaCO₃ and the lithologic characteristics,the soil lightness,redness and yellowness as climatic index are divided as MIS4, MIS3,MIS2 and MIS1 four stages at centennial and millennial time scales and are compared with the researches on Greenland GRIP ice core in the high latitude regions and SPECMAP of recorded global ice volume change at ten millennial time scale.The results demonstrate that soil color to climatic change is a new sensitive indicator at centennial and millennial time scales and ten millennial time scale.The soil color is more reliable at the last glacial period.Yet this conclusion whether to be applicable to at Quaternary glacial period or interglacial periods still needs more profile results to prove its effectiveness.更多还原