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Soil Acidification and Solute Budgets for Forested Lysimeters in Nordrhein‐Westfalen
Author(s) -
van Grinsven Hans J. M.,
Wesselink Bart G.,
Schroeder Manfred,
van Breemen Nico
Publication year - 1991
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19911540306
Subject(s) - lysimeter , deciduous , beech , soil acidification , environmental science , chemistry , soil water , forestry , soil science , soil ph , botany , geography , biology
Solute budgets and nitrogen use were quantified in two 400 m 2 forested lysimeters in St. Arnold, Nordrhein‐Westfalen. The lysimeters are covered by a mixture of oak‐beech and Weymouth pine, respectively. The average bulk deposition between May 1985 and May 1987 of NH 4 + , SO 4 2and NO 3 was 1.1, 1.7, and 0.4 kmol c ha −1 yr −1 in the deciduous stand and 2.1, 2.1, and 0.8 kmol c ha −1 yr −1 in the coniferous stand. The input of N is almost completely retained in the deciduous stand. In the coniferous stand about 30% of this N‐input is leached as NO 3 . Due to N‐transformations, total proton turnover is 4.4 kmol c ha −1 yr −1 in the coniferous stand and only 2.5 kmol c ha −1 yr −1 in the deciduous stand. Ca‐mobilization is the major acid buffering process in both lysimeters. Only the deciduous stand was limed in 1980 (90 kmol c /ha). Mobilization of Al is only relevant down to a soil depth of 30 cm. Below a 30 cm depth, Al is immobilized. The amounts of exchangeable and silicate‐bound Ca in the soil underlying the coniferous stand are very small, but no evidence was found for explanation of the observed high Ca‐mobilization by artificial Ca‐sources.