Lithologic discontinuities in ultisols along a toposequence in Taiwan

Lithologic discontinuities in ultisols along a toposequence in Taiwan
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台湾地形层序中有机土的岩性不连续性

DOI：
10.1097/00010694-200007000-00007
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
Zueng
Zueng
中科院分区：
--
文献类型：
--
作者：
Chen;Zueng

文献摘要

被引文献

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岩性不连续面（LDs）的定量识别是研究成岩作用的必要条件。摘要本研究以台湾南部的地形序列为研究对象，考察了山顶、上背坡和下背坡三个景观位置上的三种代表性土壤。本研究的目的是评估在台湾亚热带地区形成的这些土壤中是否存在母质残留物中的ld，并测试各种参数用于测定ld的效用。通过检测无粘土粒径、砂粉比、均匀度指数、Ti、Zr和Ti/Zr比的深度函数来确定ld的深度。土壤来自砂岩和页岩，是典型的古成人。本研究结果表明，由于野外观测没有不同的粒度分布，室内分析没有明确的Ti和Zr元素，因此很难识别这些土壤中的ld。成土过程模糊或破坏了这种不连续性的证据。结果表明，无粘土粒度分布（cf - psd）、砂粉比和均匀度指数（UV）是识别该拓扑序列中ld的最有用的参数。无粘土砂组分中Ti和Zr含量的深度函数以及Ti/Zr比值无法识别该部位母质的不连续性。
Quantitative identification of lithologic discontinuities (LDs) is essential for the study of pedogenesis. This study examines three representative soils on three landscape positions-summit, upper backslope, and lower backslope-along a toposequence in southern Taiwan. The objectives were to evaluate whether LDs in the residuum of parent material occurred in these soils which formed in a subtropical region of Taiwan and to test the utility of various parameters for the determination of LDs. The depth of LDs was identified by examination of the depth functions of clay-free particle sizes, sand/silt ratios, uniformity value indices, and Ti, Zr, and Ti/Zr ratios. The soils, derived from sandstone and shale, are Typic Paleudults. The results of this study indicated that the recognition of LDs in these soils was difficult in the absence of different particle size distribution in field observations and distinct Ti and Zr elements analysis in laboratory analysis. Pedogenic processes have blurred or destroyed the evidence of such discontinuities. Results indicated that clay-free particle size distributions (Cf-PSDs), sand/silt ratios, and uniformity value (UV) indices are the most useful parameters in identifying the LDs in this toposequence. The depth functions of the contents of Ti and Zr, and the Ti/Zr ratios in the clay-free sand fraction, were unable to identify the discontinuities of parent materials in this site.