黄泥类水稻土铁锰剖面分异状况的研究

STUDY ON STATUS OF IRON AND MANGANESE SPLIT IN PROFILE OF LOESS PADDY SOILS

通过对剖面各层中各种形态铁、锰的测定,研究了黄泥类水稻土剖面中铁、锰的分异特性。用淀积深度和淋淀比率表示的铁锰淋淀强度受水稻土发育程度、土体通透性及耕层铁、锰含量,尤其是耕层活性铁、锰含量的相对比率(Fe_o/Mn_o)的影响。由于淋淀比率会随着水稻土发育进程的加深而增大,犹如铁锰的淋淀强度一样,耕层的Fe_e/Mn_o比率可在一定程度上反映同类母质的黄泥类水稻上的发育程度。

Deposits of Fe and Mn in profiles of loess paddy soils are studied by determing the contents of various Fe and Mn in each horizons of profiles. The deposits result from the eluviation and accumulation of Fe and Mn in the profiles during the developing of paddy soils. The eluvial intensities of Fe and Mn (expressed by eluvial depth and the ratio of contents of free Fe and Mn in acaumulated horizon to arable layer in the same profile) are affected by the developing maturity,the permeability of water and air into solum and the contents of Fe and Mn especialally the relative contents of active Fe and Mn(expressed by the ratio of Fe0/Mn0)in arable horizon There is a lower ratio of Fe0/Mn0 in A horizon of those loess paddy soils derived from Q2(quaternary red clay with high content of Fe and Mn) and the accumulation of Mn is stronger than Fe in profiles and those derived from shale are opposite. Because the ratio of Fe0/Mn0 in A horizon will get greater and greater with the developing maturity it is supposed that this ratio can measure the maturity of those loess paddy soils derived from xhe same parent material.