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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Elevations of sulfurous layers in acid sulfate soils: What do they indicate about sea levels during the Holocene in eastern Australia?
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Elevations of sulfurous layers in acid sulfate soils: What do they indicate about sea levels during the Holocene in eastern Australia?

机译:酸性硫酸盐土壤中的硫层高度:它们表明澳大利亚东部全新世期间的海平面吗?

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摘要

This study is the first large scale examination of the stratigraphic relationships of acid sulfate soils in Australia. Field and laboratory data from 346 excavated acid sulfate soil profiles for an extensive soil survey undertaken to map their extent were classified into non acid sulfate soil (NASS), potential acid sulfate soil (PASS), and actual acid sulfate soil (AASS) layers, and the elevation of these layers within different geomorphic environments was examined. Layers containing sulfurous materials were found at 0.35 m below mean sea level in intertidal swamps, around mean sea level in areas subject to intermittent water logging, and greater than 0.40 m above mean sea level in other areas. Sulfurous materials in intertidal swamps represent present day formation while in other landforms are evidence for a sea level that was once higher than at present. The division of sulfurous sediment elevations into two groups above present day sea level could be explained by two processes. Firstly, two periods of higher sea level during the Holocene could result in sulfurous materials at different levels. Secondly, the barrier system which developed along the NSW coast during the Holocene and impounded a series of estuarine mud basins could have resulted in the formation of sulfurous materials at higher elevations along the edge of the lakes and at lower elevations on the lake beds themselves..
机译:这项研究是澳大利亚酸性硫酸盐土壤地层关系的首次大规模检验。来自346个开挖的酸性硫酸盐土壤剖面的现场和实验室数据,用于进行广泛的土壤调查以绘制其范围,将其分类为非酸性硫酸盐土壤(NASS),潜在的酸性硫酸盐土壤(PASS)和实际的酸性硫酸盐土壤(AASS)层,并检查了这些地层在不同地貌环境中的高度。在潮间带沼泽中,含硫物质的层位于平均海平面以下0.35 m处,在间歇性涝灾地区平均海平面附近,而在其他地区则高于平均海平面0.40 m以上。潮间带沼泽中的含硫物质代表了当今的形成,而其他地貌中的含硫物质则表明海平面曾经比现在高。含硫沉积物海拔高度分为当今海平面以上的两组可以用两个过程来解释。首先,全新世期间两次海平面上升可能导致含硫物质处于不同的水平。其次,在全新世期间沿着新南威尔士州海岸发展的屏障系统并蓄积了一系列河口泥盆,这可能导致在沿湖边缘的较高海拔处以及在湖床本身的较低海拔处形成了含硫物质。 。

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