几种土壤中不同形态铁及无定形硅铝的比较研究

分析研究白浆土、黑土和草甸土三类土壤不同形态铁和无定形硅铝表明,游离氧化铁的量在各类土中均为表层大于底层;铁的活化度白浆土高于黑土,而白浆土的白浆层又高于腐殖质层和淀积层;无定形硅、铝在白装土中层次之间分异明显,说明有淋淀现象发生,在黑土和草甸土中差异不大;新鲜有机质对铁的活化有显著作用,络合态铁和土壤腐殖质含量呈明显的正相关。

COMPARED STUDY ON DIFFERENT MORPHOLOGICAL IRON AND AMORPHOUS SILICA AND ALUMIUM IN THE VARIOUS SOILS

Compared study on different morphological iron and amorphous silica and aluminium of Albisol, Blacksoil and Meadow soil indicates that the amount of free iron is higher in surface horizon than that in botton horizon for all the three soils. The activated degree of iron in Albisol is higher than That in Black Soil. However, for Albisol it is higher in the albic horizon than that in both the humic and illuvial horizon.The significant different distrabution of the amorphous silica and aluminium among various horizon in Albisol illustrates that an elluvial and illuvial phenomenon might be taken place, but there is no evidences in Black soil and Meadow soil. The iron can be activated by the fresh organic matter remarkablely. The complex iron is significantly correlated with the amount of soil humus positively.