Details
| Original language | English |
|---|---|
| Pages (from-to) | 299-305 |
| Number of pages | 7 |
| Journal | Journal of Plant Nutrition and Soil Science |
| Volume | 163 |
| Issue number | 3 |
| Publication status | Published - 2000 |
Abstract
The potassium (K) content of soils developed from Pleistocene calcareous till, glacial sand and loess in NW Germany was investigated in order to characterize stores of K in feldspars (Kfeldspar) and mica/illite (Kmica/illite) as well as changes as a function of soil depth. From each horizon, up to seven sand, six silt and three clay fractions were separated. Kfeldspar and Kmica/illite were quantified by means of chemical composition and estimation by IR-spectroscopy. On account of distinct differences in mineralogical composition between different particle size fractions, K-content of the bulk soil < 2000 (im and the proportion of Kmica/illite and Kfeldspar are clearly related to grain size distribution of the sample. Generally, the K-content of particle size fractions of a soil derived from calcareous till is significantly higher than that of a soil from glacial sands. Kmica/illite of clay and silt fractions increases with depth, reflecting greater mica/illite weathering at the soil surface, whereas Kfeldspar shows no noticeable change. Illite accumulates by lessivage in Bt horizons. On a whole-soil basis, the Bt horizons of Luvisols derived from loess and calcareous till contain more Kmica/illite than either the A or the C horizons. By comparing the K-content in the different particle size fractions with soil depth, the highest rate of change is found for soils derived from glacial sand. Gains in K in the silt fractions of soils from calcareous till and glacial sand result from weathering of feldspar sand grains. Additionally, decomposition of feldspar-containing rock fragments of gravel size, and aeolian sedimentation, may also have contributed to these gains.
Keywords
- Forest soils, Lessivage, Pleistocene sediments, Potassium, Silicate weathering
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Soil Science
- Agricultural and Biological Sciences(all)
- Plant Science
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In: Journal of Plant Nutrition and Soil Science, Vol. 163, No. 3, 2000, p. 299-305.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Effects of silicate weathering and lessivage on K-content in forest soils derived from Pleistocene sediments
AU - Dultz, Stefan
N1 - Copyright: Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2000
Y1 - 2000
N2 - The potassium (K) content of soils developed from Pleistocene calcareous till, glacial sand and loess in NW Germany was investigated in order to characterize stores of K in feldspars (Kfeldspar) and mica/illite (Kmica/illite) as well as changes as a function of soil depth. From each horizon, up to seven sand, six silt and three clay fractions were separated. Kfeldspar and Kmica/illite were quantified by means of chemical composition and estimation by IR-spectroscopy. On account of distinct differences in mineralogical composition between different particle size fractions, K-content of the bulk soil < 2000 (im and the proportion of Kmica/illite and Kfeldspar are clearly related to grain size distribution of the sample. Generally, the K-content of particle size fractions of a soil derived from calcareous till is significantly higher than that of a soil from glacial sands. Kmica/illite of clay and silt fractions increases with depth, reflecting greater mica/illite weathering at the soil surface, whereas Kfeldspar shows no noticeable change. Illite accumulates by lessivage in Bt horizons. On a whole-soil basis, the Bt horizons of Luvisols derived from loess and calcareous till contain more Kmica/illite than either the A or the C horizons. By comparing the K-content in the different particle size fractions with soil depth, the highest rate of change is found for soils derived from glacial sand. Gains in K in the silt fractions of soils from calcareous till and glacial sand result from weathering of feldspar sand grains. Additionally, decomposition of feldspar-containing rock fragments of gravel size, and aeolian sedimentation, may also have contributed to these gains.
AB - The potassium (K) content of soils developed from Pleistocene calcareous till, glacial sand and loess in NW Germany was investigated in order to characterize stores of K in feldspars (Kfeldspar) and mica/illite (Kmica/illite) as well as changes as a function of soil depth. From each horizon, up to seven sand, six silt and three clay fractions were separated. Kfeldspar and Kmica/illite were quantified by means of chemical composition and estimation by IR-spectroscopy. On account of distinct differences in mineralogical composition between different particle size fractions, K-content of the bulk soil < 2000 (im and the proportion of Kmica/illite and Kfeldspar are clearly related to grain size distribution of the sample. Generally, the K-content of particle size fractions of a soil derived from calcareous till is significantly higher than that of a soil from glacial sands. Kmica/illite of clay and silt fractions increases with depth, reflecting greater mica/illite weathering at the soil surface, whereas Kfeldspar shows no noticeable change. Illite accumulates by lessivage in Bt horizons. On a whole-soil basis, the Bt horizons of Luvisols derived from loess and calcareous till contain more Kmica/illite than either the A or the C horizons. By comparing the K-content in the different particle size fractions with soil depth, the highest rate of change is found for soils derived from glacial sand. Gains in K in the silt fractions of soils from calcareous till and glacial sand result from weathering of feldspar sand grains. Additionally, decomposition of feldspar-containing rock fragments of gravel size, and aeolian sedimentation, may also have contributed to these gains.
KW - Forest soils
KW - Lessivage
KW - Pleistocene sediments
KW - Potassium
KW - Silicate weathering
UR - http://www.scopus.com/inward/record.url?scp=0141582320&partnerID=8YFLogxK
U2 - 10.1002/1522-2624(200006)163:3<299::AID-JPLN299>3.0.CO;2-F
DO - 10.1002/1522-2624(200006)163:3<299::AID-JPLN299>3.0.CO;2-F
M3 - Article
AN - SCOPUS:0141582320
VL - 163
SP - 299
EP - 305
JO - Journal of Plant Nutrition and Soil Science
JF - Journal of Plant Nutrition and Soil Science
SN - 1436-8730
IS - 3
ER -