Bayreuther Institut für Terrestrische Ökosystemforschung
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Bakker, MR; Dieffenbach, A; Ranger, J: Soil solution chemistry in the rhizosphere of roots of sessile oak (Quercus petraea) as influenced by lime, Plant and Soil, 209, 209-216 (1999)
This study describes the soil chemistry in the rhizosphere of fine roots of sessile oak (Quercus petraea) (M.) Liebl.) grown in rhizotrons. A control was compared with soils treated with an equivalent CaCO3 of 1.4 t ha-1 CaO. Solution samples were extracted from the B-horizon using micro suction cups with a suction of ~40 kPa. Two series of experiments were carried out: one irrigated with rain water (age of seedling 2 to 4 months) and one irrigated with demineralized water (age of seedling 1.5 to 2 months). Half of the sampling points were chosen close to the roots and half in the bulk soil. In both experiments there was generally no rhizosphere gradient after liming. In contrast, in the control, depletion in the rhizosphere occured for most of the ions studied (Mg, Ca, Al, K, NO3-, NH4+, Cl-) in the demineralized water experiment, but this was different when rainwater was used. The latter effect is probably due to the higher solution concentrations in the rainwater experiment but could also be a result of root damage due to low Ca/Al ratios in the rizosphere solution. It was concluded, that liming improved the chemical composition in the rhizosphere soil solution by increasing overall solute concentration to levels enabling sufficient and easier nutrient uptake by roots.
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