Clay Mineralogy in Arctic Tundra Gelisols, Northern Alaska
Clay Mineralogy in Arctic Tundra Gelisols, Northern Alaska
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DOI：
10.2136/sssaj2009.0187
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发表时间：
2010-03-01
影响因子：
2.9
通讯作者：
Naidu, Sathy
中科院分区：
文献类型：
--
作者：
Borden, Patrick W.;Ping, Chien-Lu;Naidu, Sathy
人们对阿拉斯加北极草皮的化学风化过程知之甚少，那里的水分通常不受限制，酸度各不相同，平均草皮温度接近或低于冰点。土壤中的风化反应将原生矿物转化为次生粘土矿物。对阿拉斯加北极麓丘陵北部潮湿酸性苔原 (MAT) 三个地点和潮湿非酸性苔原 (MNT) 三个地点的粉质壤土质地土壤进行了表征，重点强调了粘土矿物的起源。 MNT 土壤具有不连续且较薄的有机层，这导致比 MAT 草皮更深的夏季解冻和更大的低温扰动。 MNT 比 MAT 具有更高的阳离子交换容量和碱饱和度。这些缓冲剂可防止酸化并解释 MAT 和 MNT 的 pH 差异。 MAT/MNT 边界上的其他化学特征（包括 C 和 N 含量以及 Fe 和 Al）相似（按水平线）。粗粘土（0.0002-0.002 mm）和细粘土（
Little is understood about chemical weathering processes in Alaskan arctic sods, where moisture is generally not limited bill acidity varies and the average sod temperature is close to or below freezing. Weathering reactions in soil convert primary minerals into secondary clay minerals. Silty loam textured soils from three sites in moist acidic tundra (MAT) and three sites in moist nonacidic tundra (MNT) in the northern Arctic Foothills, Alaska, were characterized with emphasis on the origin of the clay minerals. The MNT soils had a discontinuous and thinner organic layer, which leads to a deeper summer thaw and greater cryoturbation than the MAT sods. The MNT had higher cation exchange capacity and base saturation than MAT. These buffer against acidification and account for the pH differences of MAT and MNT. Other chemical characteristics including C and N content as well as Fe and Al were similar (by horizon) across the MAT/MNT boundary. X-ray diffraction of coarse (0.0002-0.002 mm) and fine clay (