The effect of hillslope geomorphology on properties of soils formed over horizontally bedded acid gray and black shale was evaluated in the Knobs region of eastern Kentucky. The geology and geographic extent of the Knobs made it possible to apply state factor analysis by systematizing local variation in parent material, while regional climate and vegetation were held constant. Nose-, head-, and sideslopes truncating black shale are steeper (36–62%) than respective hillslopes truncating gray shale (20–32%). Hapludults on these hillslopes are polygenetic: colluvium overlies buried Bt horizons formed in shale residuum. This discontinuity is characterized by a zone of soil creep, differences in soil fabric, and changes in particle size and TiO₂/ZrO₂ depth functions. Soil chemical properties vary with hillslope geomorphic component and parent material. Although black shale strata have 20 to 30 times more organic C and up to 10 times more S than gray shale, soil material formed from the two types of strata have simllar organic C and S contents. Soil material that formed from black-shale-derived colluvium or residuum in noseslopes, however, has lower pH (<4) and higher Al saturation (>90%) than soil material derived from black or gray shale in other hillslope geomorphic components. Joint contribution of the Kentucky Agric. Exp. Stn. and USDA-SCS. This investigation (no. 90-3-160) is in connection with a project of the Kentucky Agric. Exp. Stn. and is published with approval of the director.
显示更多 [+] 显示较少 [-]
AGRIS - 国际农业科技情报系统
Share
出版者
Soil Science Society of America
其它主题
Soil creep; Soil fabric; Zirconium oxide; Topographic slope; Soil chemical properties; Hapludults
语言
英语
注释
Epub
类型
Journal Article; Text
2024-02-28
2026-02-03
MODS