DESCRIPTIONS HORIZON Fresh to partly decomposed Organic arganic matter horzon (0) Organic concentration-original form of vegetal matter Highly decomposed organic matter in a Leached mineral matrix horizon (A) Coarser mineral horizon from which iron. aluminum,clay minerals,and carbonates have been removed to lower horizons Accumulation Fine organic material and clay minerals derived from the A horizon horizon (8】 Accumulations of clays and iron oxides Partially Heavily decomposed parent material near top weathered of horizon.Grades down into partially horizon weathered to unweathered material at (C) base. Parent Unaltered parent material material 土壤形态2024/8/22 自然地理学 6