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以改进的连续分级提取方法，用1mol／LKCl，0．2mol／LHCl，0．1mol／LNa4P2O7（pH8．5），DCB溶液，0．33mol／L柠檬酸钠（pH7．3）和0．5mol／LNaOH为提取剂，把红壤中可提取的非晶态铝区分为交换态铝（ExAl），吸附态无机羟基铝（HyAl），有机配合态铝（OrAl），氧化铁结合态铝（DCBAl），层间铝（InAl）和非晶态铝硅酸盐（NcAl）。每一种铝形态在其结构组成和性质上都有自己固有的特征，并与红壤相应的性质和生态特征密切相关。在同一个土壤中，其数量上有NcAl＞InAl＞DCBAl＞OrAl＞HyAl＞ExAl的趋势。除ExAl外，其余五种铝形态均为玄武岩发育的红壤多于花岗岩发育的红壤。土壤中铝大部分以层状铝硅酸盐矿物存在。并以选择性溶解方法单独提取作比较。
With the improved continuous fractionation method, with 1mol / L KCl, 0.2mol / LHCl, 0.1mol / L Na4P2O7 (pH8.5), DCB solution, 0.33mol / L sodium citrate / LNaOH as extractant, the amorphous aluminum which can be extracted from red soil is divided into exAl, HyAl, OrAl, DCBAl, , Inter-layer aluminum (InAl), and amorphous aluminosilicate (NcAl). Each form of aluminum has its own inherent characteristics in its composition and properties and is closely related to the corresponding properties and ecological characteristics of red soils. The same soil, the number of NcAl> InAl> DCBAl> OrAl> HyAl> ExAl trend. Exalted ExAl, the other five forms of aluminum were all red basalts with more red soils than those with granites. Most of the aluminum in the soil is present as layered aluminosilicate minerals. And compared with the selective dissolution method separately extracted.