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- W2378078455 abstract "Studies of seven typical soil profiles showed that in the argillic soils derived from loess in the warmtemperate zone of China all the oxides of Fe, Mn, Al and Si were enriched with the accumulation of clayfraction in the profiles. But owing to the influence of oxidation-reduction process the migration velocity ofFe and Mn was faster than that of clay. The free degrees of those metals were in the sequence MnFeAl,which reflected their different chemical activities in soil. In soils at the same level of development, the freedegree of iron and its activity, the free degree of Al, Alo/Alt× 100, SiO_2/R_2O_3, Sio/Sit× 100, and themagnetic susceptibility were relatively close to each other respectively. It might be considered that both thefres degrees of Fe and Al and Alo/Alt× 100 could serve as the distinctive indexes for argillic soils in warmtemperate zone. The paleoclimate corresponding to the fifth layer of paleosol (s_5) in Lnochuan, Shaanxiwas warmer and more humid than the present, and the paleoecological landscape approximated to today'sbioclimatic belt between the temperate deciduous broadleaved forest and the semiarid forest types.The Mossbouer spectra of the colloidal fraction (1um) in the clayified horizon of argillic dark loessialsoil, cinnamon soil, brown earth and (s_5) paleosol indicated the superparamagnetic state at room temperature.The magnetic splitting six line spectra were observed clearly at 80 K. The results fitted with a computershowed that hematite and goethite were predominant in iron oxides and commonly existed as fine particles.The proportion of hematite and goethite in soil colloids varied considerably with different climates. Thehigher the temperature, the larger the proportion of hematite." @default.
- W2378078455 created "2016-06-24" @default.
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- W2378078455 date "1994-01-01" @default.
- W2378078455 modified "2023-09-25" @default.
- W2378078455 title "Characteristics of Oxides in Argillic Soils of Warm Tem-perate Zone in China" @default.
- W2378078455 hasPublicationYear "1994" @default.
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