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首页> 外文期刊>Geomorphology >The geomorphology - sediment distribution - soil formation nexus on the northeastern Qinghai-Tibetan Plateau: Implications for landscape evolution
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The geomorphology - sediment distribution - soil formation nexus on the northeastern Qinghai-Tibetan Plateau: Implications for landscape evolution

机译：青藏高原东北部的地貌-沉积物分布-土壤形成联系：对景观演化的启示

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摘要

The interactions between geomorphology, sediment distribution and soil development in alpine regions are poorly understood. In this study, we analyzed the spatial variations of different sediment types and corresponding soils in 15 pedosedimentary profiles across three major geomorphic units in an alpine ridge-valley basin of the Qilian Mountains, northeastern Qinghai-Tibetan Plateau. Particle size distribution was used to trace the sediment types. Inorganic and organic carbon concentrations were included as metrics of soil processes. Aeolian silts from both distant and proximal sources cover floodplains, hillslopes and some positions on alluvial fans, while the distribution of fluvial sediments and periglacial slope deposits are much more limited due to the coverage of loess. The soils vary in response to sediment types and climatic conditions under the influence of their geomorphic settings. The vertical distribution patterns of carbonates in soil profiles show considerable differences among different geomorphic units, reflecting their contrasting water balance and migration pathways. Soil organic carbon accumulates most extensively in aeolian silts with sufficient water supply. A special pedogenic soil horizon - the mattic epipedon is formed primarily in loessial sediments in Kobresia ecosystems. The complex entanglement of fine earths and massive grassroots make the mattic epipedon extremely resilient, which helps to preserve the soils and to shape the landscapes. By integrating geomorphology, sedimentology, ecology and pedology, the outcomes of this study promote the understanding of the evolution of typical landscapes and ecosystems of the northeastern Qinghai-Tibetan Plateau and many other periglacial settings. (C) 2020 Elsevier B.V. All rights reserved.
机译：人们对高山地区的地貌，沉积物分布和土壤发育之间的相互作用了解甚少。在这项研究中，我们分析了青藏高原东北部祁连山的三个高地脊盆地中三个主要地貌单元中15种沉积特征剖面中不同沉积物类型和相应土壤的空间变化。粒度分布用于追踪沉积物类型。无机和有机碳浓度被包括在内作为土壤过程的指标。来自遥远和近端的风沙淤泥覆盖了洪泛区，山坡和冲积扇上的某些位置，而河流沉积物和冰缘斜坡沉积物的分布由于黄土的覆盖而更加有限。在地貌环境的影响下，土壤根据沉积物类型和气候条件而变化。碳酸盐在土壤剖面中的垂直分布模式显示出不同地貌单元之间的显着差异，反映了它们相反的水平衡和迁移途径。充足的水供应使土壤有机碳在风沙淤泥中的积累最为广泛。特殊的成岩土壤层-mattic epipedon主要形成于小嵩草生态系统的黄土沉积物中。细土和大量草根的复杂缠结使无光泽的脚手架极具弹性，有助于保护土壤并塑造景观。通过整合地貌，沉积学，生态学和生态学，这项研究的结果促进了对东北青藏高原和许多其他冰缘环境典型景观和生态系统演变的理解。 （C）2020 Elsevier B.V.保留所有权利。

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  • 来源
    《Geomorphology》 |2020年第1期|107040.1-107040.13|共13页
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  • 作者单位

    Chinese Acad Sci Inst Soil Sci State Key Lab Soil & Sustainable Agr Nanjing 210008 Peoples R China|Univ Gottingen Inst Geog D-37077 Gottingen Germany;

    Chinese Acad Sci Inst Soil Sci State Key Lab Soil & Sustainable Agr Nanjing 210008 Peoples R China|Univ Chinese Acad Sci Beijing 100049 Peoples R China|Chinese Acad Sci Nanjing Inst Geog & Limnol Key Lab Watershed Geog Sci Nanjing 210008 Peoples R China;

    Univ Gottingen Inst Geog D-37077 Gottingen Germany;

    Neijiang Normal Univ Sch Geog & Resource Sci Neijiang 641100 Peoples R China;

    Jiangsu Normal Univ Sch Geog Geomat & Planning Xuzhou 221116 Jiangsu Peoples R China;

    Chinese Acad Sci Inst Soil Sci State Key Lab Soil & Sustainable Agr Nanjing 210008 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Aeolian sediments; Mattic epipedon; Landscape evolution; Qilian Mountains;

    机译：风沙沉积物;哑光表皮;景观演变;祁连山;

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