Titlebook: Soil Geography of the USA; A Diagnostic-Horizon James G. Bockheim Book 2014 Springer International Publishing Switzerland 2014 Diagnostic S

滔滔不绝地讲

recession

Mollic Epipedon,il, Chernozems, chestnut soils, Brunizems, Phaeozems, and Kastanozems. The origin of the mollic epipedon is only partially understood; however, the relation between Mollisols and grassland or steppe has been recognized for more than a century (Shantz 1923). Soils containing a mollic epipedon are amo

Hyperalgesia

Umbric Epipedon,epipedon is defined as follows: (1) a thickness of ≥10–≥25 cm (commonly ≥18 cm), depending on texture; (2) a moist color value and chroma of ≤3; (3) a base saturation (by NH.OAc) of <50 %; (4) a SOC concentration of ≥0.6 %; (5) a phosphate concentration of <1,500 mg per kg (by citric-acid extraction

保存

Histic and Folistic Epipedons, epipedon is defined as an organic horizon that is saturated for <30 days per year in normal years and is >15 or >20 cm thick, depending on the proportion of . fibers. In contrast, the histic epipedon is an organic horizon that is saturated for >30 days per year in normal years and is at least 20–40

惊奇

Judicious

Albic Horizon,ral soil surface. The albic horizon is defined as an eluvial horizon, ., that “generally occurs below an A horizon but may be at the mineral soil surface” (Soil Survey Staff 2010, p. 9). An argillic, cambic, kandic, natric, or spodic horizon or a fragipan generally occurs below the albic horizon. In

斜谷

手段

Calcic and Petrocalcic Horizons,petrocalcic horizon. Soils with such horizons are found in many parts of the world, though mainly in the arid regions. The study of soils with calcic and petrocalcic horizons is highly relevant because they (1) contain high concentrations of inorganic C (Schlesinger 1982; Hirmas et al. 2010), (2) ca

一大块

Cambic Horizon,bonate, gypsum, soluble salts, etc., Soil Survey Staff 2010). Cambic horizons are often associated with Inceptisols; however, they may occur in other soil orders as well. Moreover, not all Inceptisols contain a cambic horizon. Although the occurrence of soils with cambic horizons is thought to be fa

审问,审讯

Duripan Horizon and Durinodes,emented by silica into a hardpan, it is referred to as a “duripan” or in the geological literature as “silcrete” or “duricrust” (Milnes and Twidale 1983). In . (Soil Survey Staff 2010), a duripan is defined as a “silica-cemented subsurface horizon with or without auxiliary cementing agents.” Other c