Quantifying the contribution of dust to alpine soils in the periglacial zone of the Uinta Mountains, Utah, USA
Quantifying the contribution of dust to alpine soils in the periglacial zone of the Uinta Mountains, Utah, USA
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DOI：
10.1016/j.geoderma.2020.114631
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发表时间：
2020-11
期刊：
影响因子：
6.1
通讯作者：
J. Munroe;E. Norris;Pratt M. Olson;P. Ryan;M. Tappa;B. Beard
中科院分区：
文献类型：
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作者：
J. Munroe;E. Norris;Pratt M. Olson;P. Ryan;M. Tappa;B. Beard
对美国犹他州尤塔山脉的高山土壤剖面进行了调查，以确定长期的粉尘沉积如何影响这种环境下的土壤性质。实地研究集中在四个高于林木线的地点，所有这些地点显然都超出了更新世期间侵蚀性冰川的范围。比较了现代沙尘、土壤A、B层和当地基岩的主微量元素地球化学特征以及Sr、Nd同位素组成。在所有情况下，土壤样本都是灰尘和当地基岩末端成员的混合物，a层更像灰尘，B层更像基岩。计算估计，这些土壤剖面含有约50%至80%的灰尘，这些灰尘通过低温扰动有效地向下混合到土壤中。由于这些景观位置没有冰川作用，土壤剖面中所含的尘埃总量相对于冰川极限内较低海拔的地点要大。除了改变这些土壤剖面的物理性质，包括水平和质地外，富含碱阳离子的尘埃沉积对土壤肥力有积极影响。
Profiles of alpine soils in the Uinta Mountains (Utah, USA) were investigated to determine how long-term dust deposition has influenced soil properties in this environment. Field studies were focused on four above-treeline sites, all of which were apparently beyond the reach of erosive glacial ice during the Pleistocene. Modern dust, soil A and B horizons, and local bedrock were compared in terms of major and trace element geochemistry, along with Sr and Nd isotope compositions. In all cases, soil samples are a mixture of dust and local bedrock end members, with A horizons more closely resembling dust, and B horizons more similar to bedrock. Calculations estimate that these soil profiles contain ~50 to 80% dust, which is effectively mixed downward into the solum by cryoturbation. Because these landscape positions were not glaciated, the total amount of dust contained within soil profiles is large relative to sites at lower elevation within the glacial limit. In addition to altering physical properties of these soil profiles, including horizonation and texture, deposition of dust rich in base cations positively influences soil fertility.