研究表明，红土风化壳剖面自下而上，伊利石、高岭石减少，三水铝石、针铁矿、赤铁矿增多。
The study shows that from the bottom to the top of laterite weathering crust profile, illite and kaolin decrease, gibbsite, goethite and hematite increase.
渗育型水稻土P层的赤铁矿含量比相应的母土低，其针铁矿铝替代量较其它水型的水稻土高。
The amount of Al-substitution in goethite in P horizon clays of percogenic paddy soil was higher than that of other diagnostic horizon clays of paddy soil.
水铁矿吸附的磷比针铁矿和赤铁矿所吸附的磷更难解吸；
P adsorbed by ferrihydrate was much more difficult to be desorbed than those by goethite and hematite.
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