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| Brumme, R; Leimcke, U; Matzner, E: Interception and uptake of NH4 and NO3 from wet deposition by above-ground parts of young beech (Fagus silvatica L.) trees, Plant and Soil, 142, 273-279 (1992) | |
Abstract:
Uptake of NH 4 and NO 3 by above ground parts of beech trees was studied by spraying young trees with
varying concentrations of ZSN labeled solutions, different N-forms, and spray regimes over four months.
Following treatment, the trees were harvested and analyzed for 15N and major element content.
Throughfall was collected and analyzed in addition in order to study the interaction between nitrogen
uptake and cation leaching.
Significant amounts of N were taken up by the above ground plant parts in all treatments as indicated
by 15N analysis of the trees as well as by throughfall measurements. NH 4 uptake exceeded the uptake of
NO 3 if applied in the same concentration. Uptake of N increased linearly with increasing concentration
in the spray solution and with spray intensity. The uptaken N was translocated within the plant. The
contribution of N from uptake by above ground parts to the total N content of tissues differed and
reached a maximum level of 6% in leaves. No effect of above ground N uptake on the total N content
of tissues was found.
Calculating atmospheric N inputs to forest ecosystems by throughfall measurements may underestimate
the actual N input. |
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