Characteristics and genesis of Inceptisols with placic horizons in the subalpine forest soils of Taiwan

Wu, Sen-Po; Chen, Zueng‐Sang

doi:10.1016/j.geoderma.2004.09.007

Cited by 24 publications

(29 citation statements)

References 19 publications

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“…Climate appears to play a major role in that placic horizons are observed in soils with extremely high precipitation, ranging from 2400 to 3900 mm yr~ and averaging 3200 mm (Lavkulich et al, 1971;Valentine, 1969;Shoji et al, 1988;Ping et al, 1989;Hseu et al, 1999;Pinheiro et al, 2004;Wu and Chen, 2005;Schawe et al, 2007). This is the same as the 3200 mm yr~ recorded for the seven soils with placic horizons in the USA (Table 4).…”

Section: Placic Horizonssupporting

confidence: 52%

“…This is the same as the 3200 mm yr~ recorded for the seven soils with placic horizons in the USA (Table 4). Soils with a placic horizon generally occur in depressions on the landscape and have a seasonally high water table (Crampton, 1963;Lapen and Wang, 1999;Pinheiro et al, 2004;Wu and Chen, 2005). In the present study, five of the seven soil series with a placic horizon have an aquic soil moisture regime (Table 3).…”

Section: Placic Horizonsmentioning

confidence: 55%

“…In Europe placic horizons occurred in areas where the groundwater was <70 cm from the soil surface (Kaczorek et al, 2004). Soils with placic horizons occur in one of three predominant vegetation types; tropical montane forest (Pinheiro et al, 2004;Wu and Chen, 2005;Schawe et al, 2007), western conifers (Valentine, 1969;Shoji et al, 1988;Ping et al, 1989), or bog (Crampton, 1963Lavkulich et al, 1971;Lapen and Wang, 1999). Ofthe seven soil series with a placic horizon examined in this study, three support western conifers and four feature tropical montane forest (data not shown).…”

Section: Placic Horizonsmentioning

confidence: 64%

“…No bulk density values were available from the NRCS dataset, but values from the literature ranged widely from 1.00 to 2.20 with most values around 1.70 g m""-^ (Lavkulich et al, 1971;Ping et al, 1989;Hseu et al, 1999;Wu and Chen, 2005).…”

Section: Placicmentioning

confidence: 99%

“…Textural discontinuities or organic-rich horizons may be important in arresting the Fe in the placic horizon (Lapen and Wang, 1999;Pinheiro et al, 2004;Wu and Chen, 2005). These layers cause perching of the water table which enables the Fe to become temporarily reduced; with drying the Fe is mobilized and reoxidized at the textural break.…”

Section: Placic Horizonsmentioning

confidence: 99%

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Distribution and Genesis of Ortstein and Placic Horizons in Soils of the USA: A Review

Bockheim

2011

Soil Sci. Soc. Am. j.

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Soils with ortstein cover 2.2 million ha in the USA, 87% of which occur in Michigan and Florida. Of the 650 soils in the National Soil Survey database ckssified as Spodosols. 47 contain sufficient ortstein to be cla.ssified in the ortstein rupture-resistance class; another 42 soils contain materials that are <50% cemented and, therefore, not officially recognized as ortstein. Well-developed ortstein averages 41 cm in thickness and is moderately cemented, dense (bulk density 1.60 g cm" ). massive, very firm to extremely firm, predominantly in sandy particle-size classes, and may contain living roots. Because soils with and without ortstein often occur on the same landforms, soils containing >5% ortstein (89 series) were compared with geographically associated and competing soil series (59) that lack ortstein. using analysis of variance. Soils with ortstein occur on lesser slopes {p = 0.001 ) and at lower elevations {p = 0.015) than soils without ortstein. The lower depth boundary and thickness of the spodic horizon wete significantly greater {p = 0.001 ) in soils with ortstein than in those without ortstein. The data suggest that soil water transporting cementing materials (Fe, Al, Si, and dissolved organic C) moves more slowly in landscape positions where ortstein eventually forms than in those whete it is absent. However, ortstein is not restricted to soils with poor drainage as only 39% of the soils with ortstein have an aquic soil moisture regime. From a weight-of-evidence assessment, ortstein is cemented by Al-organic complexes and short-range-ordet compounds, and placic horizons ate cemented by Fe as ferrihydrite or as Fe-organic complexes.

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