Aeolian dust contribution to the formation of alpine soils at Amdo (Northern Tibetan Plateau)
Aeolian dust contribution to the formation of alpine soils at Amdo (Northern Tibetan Plateau)
复制标题
风尘对安多（青藏高原北部）高山土壤形成的贡献
DOI：
10.1016/j.geoderma.2015.05.012
复制
发表时间：
2015-12
期刊：
影响因子：
6.1
通讯作者：
Jin-Liang Feng
中科院分区：
文献类型：
--
作者：
Yong-Chong Lin;Jin-Liang Feng
由于寒冷的气候和物理风化条件的优势，粗大或块状的碎屑盛行。因此，成土作用是由温度和母质共同控制的。我们发现整个高寒土壤剖面的母质都富含粘土和粉质矿物。本文重点研究了高寒草甸土壤形成物质的来源。研究了不同粒度组高寒土壤的粒度分布、矿物组成、微量元素浓度和Sr-Nd同位素组成及其潜在源物质。结果表明，高寒土壤剖面底部的富红粘土层为残余古风化壳。然而，高寒土壤母质与原位基岩风化产物的遗传关系并不明显。相应地，我们证实了高山土壤中的母质具有风成成因。安多地区的冲积沉积物和广泛分布的滩、湖三角洲沉积物是高寒土壤物质的主要来源。然而，尚不清楚沉积物是否是风沙的主要来源。风沙是高寒土壤（< 20 μm和20 ~ 300 μm）的主要成分之一，其输送距离较短。相应地，我们确认了高寒土壤的少量粗组分（> ~ 300 μm）具有局部起源，即来自邻近的基岩露头。相比之下，沙尘的远距离输送对高山土壤的形成作用较小。在被调查的地区，风沙在全新世中期开始积聚。
The Tibetan Plateau has one of the largest distributions of alpine meadow in the world. Due to the cold climate and dominance of physical weathering conditions, coarse or massive debris prevails. Thus, pedogenesis is controlled by both the temperature and parent material. In this study, the alpine soils (Gelic Cambisol) at altitudes of 4768–4980 m in the Amdo zone of the northern Tibetan Plateau were investigated. We found that the parent materials throughout the alpine soil profiles were rich in clayey and silty minerals. Here, we focused on the origin of the soil forming materials of alpine meadows. We examined the grain size distribution, mineral compositions, trace element concentrations, and Sr–Nd isotopic compositions of the alpine soils and their potential source materials in various grain size fractions. Based on a comparison of many fingerprints, our results indicated that a red clay-rich bed at the bottom of the alpine soil profile is a residual paleo-weathering crust. Nevertheless, the parent materials in the alpine soils did not have a clear inherited relationship with the weathering products of the in situ bedrock. Correspondingly, we confirmed that the parent materials in the alpine soils have an aeolian origin. The alluvial sediments, and widespread beach and lacustrine delta sediments in the Amdo zone are the main source of alpine soil materials. However, it was not clear whether sediments are the main source of aeolian dust. Aeolian dust, with a short transport distance, is one of the main components (< 20 μm and 20–300 μm) of alpine soils. Correspondingly, we confirmed that the minor coarse components (> 300 μm) of alpine soils had a local origin, i.e., from adjacent bedrock outcrops. In contrast, long-range transport of dust had a minor role in the formation of alpine soils. In the region investigated, the aeolian dust began accumulating in the middle Holocene. On the Tibetan Plateau, one positive effect of aeolian processes is that the aeolian dust accretion is a source of parent materials and nutrients for alpine soils.
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DOI：
10.1177/030913338200600202
发表时间：
1982-06
期刊：
Progress in Physical Geography
影响因子：
--
作者：
J. Lautridou;J. Ozouf
通讯作者：
J. Lautridou;J. Ozouf
影响因子：
2.2
作者：
J. Wright
通讯作者：
J. Wright
影响因子：
2.9
作者：
L. Munn
通讯作者：
L. Munn
高寒嵩草草甸密度组分土壤有机碳、氮含量及草甸退化对各组分土壤碳、氮的影响
DOI：
10.1007/s11430-009-0056-5
发表时间：
2009-05
期刊：
Science in China Series D-Earth Sciences
影响因子：
--
作者：
Wang, QiJi;Lu, ZiYu;Wang, WenYing
通讯作者：
Wang, WenYing
影响因子：
6.2
作者：
Carola Küfmann
通讯作者：
Carola Küfmann