Mottling and Iron Distribution in a Glossoboralf‐Haplaquoll Hydrosequence on a Glacial Moraine in Northwestern Wisconsin
Mottling and Iron Distribution in a Glossoboralf‐Haplaquoll Hydrosequence on a Glacial Moraine in Northwestern Wisconsin
复制标题
DOI：
10.2136/sssaj1979.03615995004300030024x
复制
发表时间：
1979-05
影响因子：
2.9
通讯作者：
J. L. Richardson;F. Hole
中科院分区：
文献类型：
--
作者：
J. L. Richardson;F. Hole
本文研究了不同水分条件下Woodfordian冰川冰碛景观中氧化铁的分布以及斑驳和胶膜的形态。水文序列成员观察和采样沿着两个横断面相邻的一级流域。在所研究的所有土壤中，相当多的铁已经从A层转移到B层或土壤之外。斑驳的发展遵循一个预期的系统序列，从没有在排水良好（WD）的网站，其中不饱和运动的水占主导地位;相当多的排水不良（SPD）的网站，饱和流经常发生的地方，干湿循环的特点;很少在排水不良（VPD）的网站，潜育化一直青睐在潮湿的季节积水条件。在WD网站斑驳要么缺席或低色度的内部和面对的peds。在SPD站点，斑块表面色度低，内部色度高，Fe-Me结核相对丰富。在VPD网站中性灰色色调占主导地位的内部足和大孢子的表面上，只有少数铁结核，或在最潮湿的网站，“pipestems”。王水、连二亚硫酸盐和草酸盐萃取态铁分布的变化表征了铁化合物在序列中的结晶程度。氧化铁是最结晶的WD网站，他们往往集中在粘土部分。氧化铁集中在SPD站点的砂大小的结核。
Distribution of iron oxide and forms of mottling and cutans under various moisture regimes were studied in a Woodfordian glacial moraine landscape. Hydrosequence members were observed and sampled along two transects in adjacent first-order drainage basins. Considerable iron had been translocated out of the A horizon and either into the B horizon or out of the solum, in all pedons studied. Mottle development followed an expected systematic sequence from none at well-drained (WD) sites, where unsaturated movement of water predominates; to considerable at somewhat poorly drained (SPD) sites, where saturated flow occurs frequently and where the dry-wet cycle is characteristic; to few at very poorly drained (VPD) sites where gleying has been favored by stagnant water conditions in wet seasons. At WD sites mottles were either absent or of low chroma both in the interiors and on the faces of peds. At SPD sites mottles were of low chroma on ped faces and of high chroma inside peds, and Fe-Me concretions were relatively abundant. At VPD sites neutral gray hues predominated both inside peds and on surfaces of macrospores, and there were only a few iron concretions or, at wettest sites, “pipestems.” Changes in distribution of iron extractable by aqua regia, dithionite and oxalate characterized the degree of crystallinity of iron compounds in the sequence. Iron oxides were most crystalline at WD sites where they tended to concentrate in the clay fraction. Iron oxides were concentrated in sand-size concretions at SPD sites.