Tundra Soils Formed over Ice Wedges, Northern Alaska1
Tundra Soils Formed over Ice Wedges, Northern Alaska1
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阿拉斯加北部冰楔上形成的苔原土壤1
DOI：
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发表时间：
1967
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影响因子：
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通讯作者：
Jerry Brown
中科院分区：
文献类型：
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作者：
Jerry Brown
测定了冰楔上覆冻土带土壤的物理化学性质，并评价了冰楔生长在冻土带土壤形成过程中的作用。在常年冻结的地面上，由于冬季地面的反复开裂和冰的填充，形成了冰楔。在狭窄的洼地中，一层薄薄的土壤被隔离在扩大的楔上，形成了多边形的地面。土壤从表面向下季节性解冻，从顶部和底部冻结。伴随的水分迁移导致腹部脱水。在70 cm深的冻土带土壤中没有观察到明显的阳离子或矿物颗粒迁移。冰楔会融化，从而形成新的土壤环境。这些变化的证据可以追溯到阿拉斯加巴罗的14000年。
The physical and chemical properties of tundra soils overlying ice wedges are determined and the role of ice wedge growth in the genesis of these soils is evaluated. Ice wedges form in perennially frozen ground as a result of repetitive winter cracking of the ground and filling in by ice. A thin layer of soil is isolated over the enlarging wedge in narrow depressions which result in polygonal ground. The soil thaws seasonally from the surface downward and freezes from both the top and bottom. Accompanying moisture migration results in a dehydrated midsection. No significant migration of cations or mineral grains was observed in a 70-cm deep tundra soil. The ice wedges are subjected to melting which creates new soil environments. Evidence of these changes have been traced over a 14,000-year period at Barrow, Alaska.