Changes in water‐soluble and exchangeable ions, cation exchange capacity, and phosphorusmax in soils under alternating waterlogged and drying conditions

1998 ◽  
Vol 29 (1-2) ◽  
pp. 51-65 ◽  
Author(s):  
I. R. Phillips ◽  
M. Greenway
2002 ◽  
Vol 32 (10) ◽  
pp. 1829-1837 ◽  
Author(s):  
J Herbauts ◽  
V Penninckx ◽  
W Gruber ◽  
P Meerts

In a mixed forest stand on an ochreous brown earth in the Belgian Ardennes, pedunculate oak (Quercus robur L.) and European beech (Fagus sylvatica L.) have outwardly decreasing cation concentration profiles in wood. To test if these profiles can be ascribed to endogenous factors or to decreased availability of cations in the soil, radial profiles of water-soluble, exchangeable, and total cations and of cation exchange capacity (CEC) of wood were determined. In both species, [Formula: see text]75% of K is in the water-soluble form so is of little use for dendrochemical monitoring. About 80% of Mg is adsorbed on wood exchange sites. For Ca, 30 (beech) to 60% (oak) of total content cannot be extracted by SrCl2 and is, thus, relatively immobile in wood. Wood CEC decreases from pith to bark in European beech and from pith to outer heartwood in pedunculate oak. Decreasing profiles of exchangeable Ca and Mg in pedunculate oak and exchangeable Ca in European beech are strongly constrained by CEC and, thus, are not related to environmental change. Base cation saturation rate shows no consistent radial change in either species. European beech maintained much higher base cation saturation rate than pedunculate oak, although both species had similar CEC. In conclusion, the results do not provide convincing evidence for a significant change in nutritional status of pedunculate oak and European beech in the Belgian Ardennes due to atmospheric pollution.


1964 ◽  
Vol 44 (1) ◽  
pp. 66-75 ◽  
Author(s):  
A. J. MacLean ◽  
R. L. Halstead ◽  
A. R. Mack ◽  
J. J. Jasmin

Determination of the cation-exchange capacity of 17 organic soils by the ammonium acetate method or by measurement of H replaced from HCl-treated samples by neutral 1 N NH4OAc, 1 N and 0.5 N Ba(OAc)2, and 0.5 N KOAc gave results which were closely related. The magnitude of the values varied with procedure, however, and 1 N Ba(OAc)2 gave the highest results.In a greenhouse experiment, the average uptake of potassium and of phosphorus by plants was higher at a soil temperature of 75° F than at 57° F. Percentage uptake of potassium by the plants was significantly correlated with the following criteria of potassium supply in the soils: exchangeable K, water-soluble K, [Formula: see text] and per cent K saturation. The corresponding percentage uptake of phosphorus was significantly correlated with the amounts of phosphorus extracted from the soils with 0.03 N NH4F + 0.1 N HCl, 0.5 N HOAc, water, and 0.5 M NaHCO3. The results indicated that water might serve as a suitable extractant of both potassium and phosphorus.


1983 ◽  
Vol 14 (11) ◽  
pp. 1005-1014 ◽  
Author(s):  
G.P. Gillman ◽  
R.C. Bruce ◽  
B.G. Davey ◽  
J.M. Kimble ◽  
P.L. Searle ◽  
...  

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