Bayreuther Institut für Terrestrische Ökosystemforschung
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Dynamics of material cycles in forest ecosystems at different space and time scales


From 01/1998 to 12/2000

Principal Investigator: Egbert Matzner
Staff: Christine Alewell
Grant: 0339476 C Grundlagen zur nachhaltigen Entwicklung von Ökosystemen bei veränderter Umwelt

The characterization of ecosystem functioning with element fluxes and concentrations is an important aim in ecosystem research. One aim of this study is the organization and evaluation of the element flux measurements on the monitoring sites within the Lehstenbach catchment (Fichtelgebirge, Northeastern Bavaria, Germany). The element flux measurements are important tools to characterize ecosystems, calculate element budgets, provide the data for model simulations as well as process oriented projects at BITÖK. Measurements include element fluxes with bulk deposition, throughfall, soil solution and surface waters. Part of this project is to determine the influence of sampling frequency (14 days and daily) on time series of throughfall, soil solution and runoff chemistry. Our hypothesis was that in decreasing the sampling frequency to 1 day measurements we gain (i) a more precise recording of ecologically relevant concentration amplitudes, (ii) a better understanding of element turnover and regulating processes, (iii) a description of element fluxes and concentrations on different time scales and (iv) a minimization of the error connected to element flux calculations. First results indicated that an evaluation of the daily measurements yielded in similar correlations of water fluxes and concentrations of SO42-, NO3-, Cl-, electrical conductivity and pH as was already known from the time series with 14 days sampling frequency. Furthermore, concentration amplitudes are very comparable in both data sets. However, comparing flux calculations over a 7 month measurement period (17.03. - 26.10.1998) yielded in significant differences. Element output with runoff from the catchment Lehstenbach resulted in a significant overestimation of H+ and a significant underestimation of Cl- fluxes when calculated with the time series from 14 day sampling frequency compared to daily measurements. However, a statistical evaluation of the time series with the daily sampling frequency indicated that the maximum temporal heterogeneity was not yet reached. Thus, final evaluations or conclusion are not possible yet.

List of publications of this Project

Alewell, C: Acid inputs into the soils from acid rain in Rengel Z.: Handbook of Soil Acidity, Marcel Dekker Inc.,New York, 83-115 (2003) -- Details
Alewell, C; Novák, M: Spotting zones of dissimilatory sulfate reduction in a forested catchment; The 34S - 35S approach, Environmental Pollution, 112, 369-377 (2001) -- Details
Mitchell, MJ; Mayer, B; Bailey, SW; Hornbeck, J; Alewell, C; Dricsoll, CT; Likens, GE: Use of stable isotopes for evaluating sulfur sources and losses at the Hubbard Brook Experimental Forest, Water, Air and Soil Pollution, 130, 75-86 (2001) -- Details
Alewell, C: Predicting reversibility of acidification: The European sulfur story., Water, Air and Soil Pollution, 130, 1271-1276 (2001)
Prechtel, A; Alewell, C; Michalzik, B; Matzner, E: Different effect of drying on the fluxes of dissolved organic carbon and nitrogen from a Norway spruce forest floor, Journal of Plant Nutr. Soil Sci., (2000) 163, 517-521 (2000) -- Details
Manderscheid, B; Schweisser, T; Lischeid, G; Alewell, C; Matzner, E: Sulfate pools in the weathered substrata of a forested catchment, Soil Sci. Soc. Amer. J., 64, 1078-1082 (2000), doi:10.2136/sssaj2000.6431078x -- Details
Manderscheid, B; Jungnickel, C; Alewell, C: Spatial variability of sulfate isotherms in forest soils at different scales and its implications for the modeling of soil sulfate fluxes, Soil Science, 165, 848-857 (2000) -- Details
Groscheová, H; Novák, M; Alewell, C: Changes in the d34S ratio of pore-water sulfate in incubated sphagnum peat, Wetlands, 20/1, 62-69 (2000) -- Details
Lischeid, G; Moritz, K; Bittersohl, J; Alewell, C; Matzner, E: Sinks of anthropogenic nitrogen and sulphate in the Lehstenbach catchment (Fichtelgebirge): lessons learned concerning reversibility., Silva Gabreta, 4, 41-50 (2000) -- Details
Alewell, C; Manderscheid, B; Bittersohl, J; Meesenburg, H: Is acidification still an ecological threat?, Nature, 407, 856-857 (2000) -- Details
Alewell, C; Mitchell, M; Likens, GE; Krouse, RH: Assessing the origin of sulfate deposition at the Hubbard Brook Experimental Forest, J. Environmental Quality, 29, 759-767 (2000) -- Details
Alewell, C; Manderscheid, B; Gerstberger, P; Matzner, E: Effects of reduced atmospheric deposition on soil solution chemistry and elemental contents of spruce needles in NE - Bavaria, Germany, Journal of Plant Nutr. Soil Sci., (2000) 163, 509-516 (2000) -- Details
Alewell, C; Gehre, M: Patterns of stable S isotopes in a forested catchment as indicators for biological S turnover, Biogeochemistry, 47, 319-333 (1999) -- Details
Alewell, C; Mitchell, M; Likens, GE; Krouse, RH: Sources of stream sulfate at the Hubbard Brook Experimental forest: Long-term analysis using stable isotopes, Biogeochemistry, 44, 281-299 (1999) -- Details
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