论文部分内容阅读
黄土、古土壤剖面中物质粒度是恢复古环境的重要指标之一。精确地测定粒径的大小,是准确而可靠获取气候变化信息的基本前提。通过对洛川典型黄土剖面古土壤S 4及相临黄土层高密度、连续样品多次重复粒度测试结果经统计分析表明:粒径测量的误差主要来自于两方面,即仪器测量与前处理过程,其中前处理过程的影响是粒度测量中误差的主要来源。同时证明,单次测量结果具有不确定性,因此可靠的粒度参数需经多次测量平均获得。但是,此过程会导致某些快速变化信息的丢失和因峰态的平滑而造成粒度变化所反映的变化幅度弱化。
Loess, paleosol profile in the grain size is one of the important indicators to restore ancient environment. Accurately measuring the size of the particle size is the basic prerequisite for accurate and reliable access to climate change information. Through the analysis of the results of multiple repeated particle size tests of the high-density and continuous-loam samples of ancient soils S 4 and adjacent loess in the typical loess section of Luochuan, statistical analysis shows that the errors of particle size measurement mainly come from two aspects, namely, the measurement and pretreatment , Of which the impact of pretreatment process is the main source of error in particle size measurement. At the same time, it is proved that the single measurement result has uncertainty. Therefore, the reliable particle size parameter needs to be obtained through multiple measurements. However, this process can result in the loss of some fast-changing information and the diminished level of change reflected by the change in grain size due to the kurtosis of the kurtosis.