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Related to A-horizon: soil profile
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Noun1.A-horizon - the top layer of a soil profileA-horizon - the top layer of a soil profile; usually contains humus
humus - partially decomposed organic matter; the organic component of soil
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This is illustrated by Factor 1 in the A-horizon and Factor 2 in the B- and C-horizons loading heavily on Cd, Pb, and Zn, Factor 2 in the A-horizon and Factor 3 in the Band C-horizons loading heavily on Co and Fe, and Factor 3 in the A-horizon and Factor 1 in the B- and C-horizons loading heavily on Cu, Mo, and Ni (Table 4).
Source Sum of Degrees of freedom Mean squares squares A-Horizon Soil Level 1 0.
Cumulative runoff correlated with the coarse sand content in the A-horizon and organic carbon content in the top 30 mm of the soil (Table 6).
However, a stepwise regression with more variables (such as slope, A-horizon clay content, or bulk density) also indicated cover as the only significant predictor.
Comparisons of A-horizon thickness, organic carbon content, and bulk density indicate that the A horizon depletion has greatly diminished from its earlier pace.
Overall, however, the loss of A-horizon thickness is greatest from 1934 to 1968, averaging close to 10 in (25 cm) during that time period.
By this time, the whole surface was covered with the forest floor beneath which the A-horizon had formed even in the absence of the ground vegetation (Table 1).
As a result of humus accumulation, the depth of the A-horizon (10YR3/1) is 8 cm; it is commonly rooted by fine and medium roots, and its boundary is gradually clear and smooth.
Interflow through the A-horizon will accumulate and persist for longer within the lower parts of the landscape, leading to paler A-horizon colours.
2]O), and P retention, and A-horizon total C, total N, exchangeable Ca, and A-horizon thickness.
A-horizon throughflow is the dominant pathway for P and DOC in texture-contrast soils with: (1) a sandy loam A horizon 40-65 cm deep, (2) an A-horizon hydraulic conductivity [is greater than] 2.